user`s manual - SARA - electronic instruments
Contents
1. The Offset and Vs fields allow calculating the equivalent speed of the S waves at a given depth possibly discarding some meters from the surface offset For example to calculate the equivalent speed of the first 30 meters discarding 3 meters from the surface just enter 3 in the field Offset and 30 in the field Vs then calculating the equivalent speed of the layers in the range 3 33 meters SARA electronic instruments srl Italy 30 GeoExplorer HVSR Version 2 1 0 REPORT To generate the elaboration report just click on the Report Generate report item of the menu of the main window you can insert and edit some descriptive data of the survey in the window that will be shown these data will appear on the first page of the report You can also add up to two image files at the report The report is generated in the pdf format File m Place PaelD Address Latitude Coordinate system wass Longitude PO Elevation Weather Photo 1 c Browse Photo 2 Browse Notes Unit Counts Start time 201 3 09 12 21 17 27 Length min Sampling frequency 200 Hz Show report after generation Generate report The Generate Report button starts the report generation If the Show report after generation box is checked the program shows the report once its generation is completed using the syst2. item besides the already mentioned Lock cell and Unlock cell items that copies the grid image to the Windows clipboard SARA electronic instruments srl Italy 28 GeoExplorer HVSR Version 2 1 0 SPEEDS PROFILE CHART The window of the speeds profile chart is shown clicking the Show profile button on the window of the stratigraphic profile modelling The plot shows the profile of the speed of the P and S waves at different depths The abscissa axis shows the speed of the S waves in m s its scale is shown at the bottom of the graph If the Vp are displayed the abscissa axis also represents the P waves velocity in m s and its scale is shown at the top The values spacing is different for the two speeds so that they are properly displayed avoiding as much as possible to superimpose them The ordinate axis represents the depth in m Vp m s 400 800 1200 1600 2000 2400 2800 3200 3600 4000 m E a 400 800 1200 1600 2000 2400 2800 3200 Vs m s Show Vp Depth 190 M Auto Offset 1 5 m Vs 30 584 42 mis SARA electronic instruments srl Italy 29 GeoExplorer HVSR Version 2 1 0 The Show Vp box shows or hides the representation of the P waves speeds The Auto box enables or disables the depth automatic scaling When this view is disabled it is possible to reduce the maximum depth displayed typing the desired value in the Depth box
3. numerical labels above and below the left part of each channel indicate the signal maximum positive and negative amplitudes The unit is indicated in brackets next to the label Signal max min The numerical labels above and below the right side of each channel indicate the upper and lower limits of the current vertical scale The unit is indicated in brackets next to the label Scale max min The unit is taken from the uploaded file If the file does not contain it then the program uses the default unit the count The slider below the plots moves the signal in the horizontal direction This control is enabled only if the horizontal zoom is also enabled which is adjusted with the scroll bar below The box just to the right of the scroll bar contains the zoom level The two larger boxes on both sides of the bar show the position of the first and the last samples of the signal portion currently represented and the time to which they are related You can horizontally zoom over an arbitrary portion of the signal double clicking with the left mouse button on the point where you want the zoom to begin dragging and releasing the mouse to the end point During the operation a frame appears above the selected portion Even the mouse wheel can be used to modify the signal representation after clicking on the plot SARA electronic instruments srl Italy 8105 5 GeoExplorer HVSR Version 2 1 0 where to operate The wheel sc
4. 0 30 30 30 30 30 30 30 30 an Select all Invert Switch one window at Clear Delete atime a D E S 2 Signal spectra dB wrt 1 Counts H calculation Frequency 02 to 20 Hz Number of points 1000 V windowing Widh 5 Smoothing Konno Ohmachi El Frequency Hz Smoothing bandwidth 40 a z g o H and spectra plot options 19 Show ratio Standard deviations Manual scale 0 to 13 Horizontal HZY time H V rotate Absolute averages Vertical Manual scale to dB Show loaded H V curve Other Show single ratios Frequency manual scale to Hz Windows management The grid on the upper left corner shows the selected windows and their length It is possible to exclude them temporarily from the processing clicking on the corresponding box in the Use column The Select all button selects again all the windows if some were excluded The Clear button unchecks all the windows while the nvert button inverts the selection The Delete button deletes the selected windows It should be used with caution since it is not possible to undo this operation any deleted window must be selected again in the main window The Switch one window at a time box forces the selection of a single window at a time to understand how each window contributes to the average HVSR curve When the box is checked
5. GeoExplorer HVSR Version 2 1 0 GEOEXPLORER HVSR Version 2 1 0 USER S MANUAL 05 2015 Copyright SARA electronic instruments s r l All rights reserved SARA electronic instruments s r l Via Mercuri 4 06129 PERUGIA ITALY Phone 39 075 5051014 Fax 39 075 5006315 email info sara pg it URL WWW Sara pg it Note some features of the software may have been changed in recent versions the basic functions described in the manual still apply SARA electronic instruments srl Italy pU etr GeoExplorer HVSR Version 2 1 0 this page has been intentionally left blank SARA electronic instruments srl Italy 3 GeoExplorer HVSR Version 2 1 0 A ELI Warning This software is provided for business and research purposes It must be used in a computer system in conjunction with suitable electronic devices by qualified personnel in compliance with applicable laws regarding construction civil engineering mechanics and electronics The use of the software to determine structural parameters of buildings and or evaluate risk levels and mechanical properties of the soils is reserved to qualified and specialized personnel such as doctors in engineering architecture and physics who have attended specialization courses in geophysics and structural analysis The developer of GEOEXPLORER HVSR assumes no responsibility for any loss injury or damage of any kind when the softwar
6. SR 7 THE GEOEXPLORER ICON WILL APPEAR ON THE DESKTOP de GeoExplor 8 RUN THE PROGRAM SARA electronic instruments srl Italy GeoExplorer HVSR Version 2 1 0 QUICKSTART 9 THIS SCREEN WILL OPEN EX 1ni xl File path SPS Lenath samples seconds Lat Lon Ele zi 2 aj ef Windows selection Length 40 to 40 sec Use levels HV results T10 025 Hz _ Select all Hide levels Free selection Hide selected windows C Common Per channel modelling 10 SELECT FILE LOAD SIGNAL A SCREEN SIMILAR TO THE FOLLOWING WILL BE OPENED BY SELECTING A COMPATIBLE FILE SAF YOU CAN FIND AN EXAMPLE FILE IN THE FOLDER C GEOEXPLORER EXAMPLES IGeoExplorer HYSR 20 0 Windoys selection module 123 VES Report Tools Windows 2 XA P SOFTWARESNGeoE xplorerH SRAMT_Pila SAF Load windows Length samples 108000 Length sec 360 Save windows Longitude Elevation Exit ES Counts Channel 1 V Scale max min Counts 8192 MM 6016 8192 3808 Signal max min Counts Channel 112 N Scale max min Counts 4095 3817 4096 Scale max min Counts 8192 A x 5840 Signal max min Counts Channel 3 E 8192 z 2010 09 23 18 06 15 923 Sample 39878 a H NT x3 2010 09 23 18 07 45 919 Sample Windows selection Scale all channels L
7. ality of the signal especially to detect human generated noise which are not visible by a simple observation of the seismogram Response files The Tools Response files menu item shows the window for the selection of the response files where each channel must be associated with its own file The colored box next to each file indicates whether the file contains valid data green or not red Program update The Check for updates menu item shows the dialog for searching and installing updates of the program and the manual This feature requires a working Internet connection The Check now button check for the updates If available other buttons are shown to start the update You always need to restart the program to use the upgraded version SARA electronic instruments srl Italy 32 GeoExplorer HVSR Version 2 1 0 COMMON FUNCTIONS All displayed plots have a contextual menu displayed clicking with the right mouse button above the plot The Copy image to the clipboard item copies the plot to the Windows clipboard so you can paste it into any other application The Save as image file item saves the plot as an image file in different formats SARA electronic instruments srl Italy
8. containing the SOFTWARE and the hardware dongle are free from manufacturing defects In case of malfunction a replacement will be provided only after returning the defective part The Safenet Sentinel hardware dongle is equipped with a polyester ring indicating the serial number If the key doesn t work but the ring is damaged removed or lacerated the key will NOT be replaced under warranty the CUSTOMER must preserve with care the key and its serial number ring SARA doesn t provide any warranty about the SOFTWARE not even about any defect discrepancy or incorrect use The CUSTOMER is responsible to validate the obtained data SARA does not take any responsibility for any damage or injury direct or indirect for example loss of profit data or information property damage business or professional activity interruptions arising from the use of the SOFTWARE The SOFTWARE is subject to development and improvements Newer versions will be labeled by the three digit 1st 2nd and 3rd digit version number eg Version 2 3 5 The cost of the new versions of the software will be determined each time however the following rule is used when the Ist digit increases the software will always be with fee these versions change significantly the architecture of the program 2nd digit increases with important but not major changes will be with fee at SARA discretion versions involving bug fixes and minor improvements will vary only the 3rd digit and the
9. e H V ratio calculation would require a substantial period of time dependent on the signal length and on the settings of the calculation some tens of seconds in the case of a standard signal and processing parameters To move resize or delete a window simply click on it to select it Then use the RIGHT LEFT keys one sample shift or PAGEUP PAGEDOWN one second shift SHIFT RIGHT SHIFT LEFT one sample enlargement shrinking or SHIFT PAGEUP SHIFT PAGEDOWN one second enlargement shrinking CANC window elimination The File Load windows menu item loads the windows to select from a text file The selected files must have been previously saved through the File Save windows menu item that saves in a text file the currently selected windows Menu items and other buttons The File Exit menu item closes the program The Report menu items allows preparing and generate a report as will be shown later in a dedicated section The Tools Seismograms player menu item opens the signal audio player the manual will deal with it in the appropriate section The 7ools Response files menu item opens the window for selecting the response files to be associated with the signal channel by channel They will be used for the optional instrumental correction as will be indicated in the section about the HVSR calculation The Windows H V results menu item opens the window that shows the H V ratio calculation results You can also op
10. e average of all calculated ratios it is possible to define the HVSR curve or ellipticity curve which is representative of the site under investigation The ellipticity curve allows to directly obtain the resonance frequencies of the site and to indirectly calculate the seismo stratigraphic profile through the operation known as inversion GeoExplorer HVSR is designed to make the processing simple and immediate while leaving the professional user free to control the calculation parameters The most relevant features are Automatic or manual selection of the windows with real time updating of the HVSR curve Optional transient exclusion using amplitude thresholds The size and location of the selected windows are adjustable with one sample precision Immediate verification of the SESAME criteria on any frequency of the curve HVSR curve stationarity and directionality plots Plot of the spectrum of the single components You can define a reference stratigraphy calculate the corresponding synthetic HVSR curve and compare it to the HVSR curve currently processed e Plot of the stratigraphic profile and calculation of the S waves equivalent velocity at a given depth taking into account the offset of the foundations Customizable graphical displays Report in pdf format Optional instrumental correction e Seismic signal audification SARA electronic instruments srl Italy DUM GeoExplorer HVSR V
11. e is used in a context of vital importance or without the technical expertise needed to validate the obtained data Credits The modelling of the synthetic ellipticity curve available in GEOEXPLORER HVSR uses the GPELL module of the software suite geopsy org downloadable from www geopsy org GPELL is released under the GPL license version 2 the libraries used by GPELL distributed along with GEOEXPLORER HVSR are released under the LGPL license version 2 1 The texts of both licenses are in the gpell sub folder of the installation folder of GEOEXPLORER HVSR GPELL and its libraries source code is available on request The latest version of the source code of the geopsy org suite can be downloaded from the site http www geopsy org download php platform src SARA electronic instruments srl Italy GeoExplorer HVSR Version 2 1 0 this page has been intentionally left blank SARA electronic instruments srl Italy Ee eee ae See GeoExplorer HVSR Version 2 1 0 SOFTWARE END USER LICENSE AGREEMENT SARA electronic instruments srl SARA gives you CUSTOMER a non exclusive right to use the software GEOEXPLORER HVSR SOFTWARE The SOFTWARE and all its rights remain property of SARA The SOFTWARE is delivered in executable form on storage media or downloadable from the SARA website along with the USB hardware dongle required to use it SARA warrants that the media
12. em default program for the pdf files opening The File Save place information menu item save in a text file the information contained in the fields Place frame while the File Load place information item loads such information from a previously saved file With this function it is possible to quickly generate multiple reports for surveys made in the same place The Report Settings item of the menu of the main window allows instead to enter the parameters that should be the same for all the surveys for example the instrument type or the sensor type SARA electronic instruments srl Italy aj eee eee GeoExplorer HVSR Version 2 1 0 OTHER TOOLS Audio player The Tools Seismograms player item of the menu of the main window opens a window that allows you to listen the sound of the loaded signal signal audification 8105 Channel 1 Signal max min Counts Scale max min Counts 8132 Signal max min Select in the Channel field the channel to be played while set in the P ayback frequency field the playback frequency adjust the volume using the slider on the right The buttons along the bottom side of the window perform the standard functions of any media player Play Pause Rewind Fast forward and Stop A green vertical marker flowing on the graph of the played channel is displayed during playback as shown in the figure the graph of channel V The audio player can be useful to verify the qu
13. en it using the H V results button in the lower right corner of the main window The Windows H V modelling menu item or the H V modelling button open the window for the modelling of the synthetic ellipticity curve and the fitting of the experimental curve The Windows Reset windows positions menu item restores all the windows to their original sizes and positions this could be useful for example when one or more windows are loaded into a position outside of the screen and are no longer usable SARA electronic instruments srl Italy 7 GeoExplorer HVSR Version 2 1 0 The GeoExplorer HVSR manual menu item opens the program manual with the system default reader of pdf documents The Check for updates menu item opens the window that checks and installs the software updates The Credits menu item shows the version and the credits of the program SARA electronic instruments srl Italy 18 GeoExplorer HVSR Version 2 1 0 HVSR PROCESSING To view the result of the HVSR processing on the selected windows just click on the button H V results in the lower right corner of the main window If the window is open the plot of the processing changes dynamically based on the signal windows selected in the main window 7710 VY results module aii File Windows Windows number 0020 SESAME criteria Color Length s Tus 3
14. ength 30 to 30 sec Use leves F v Auto Y scale H results Tiof 10 Hz Selectal Hideleves 9 I Free selection Hide selected windows c modelling SARA electronic instruments srl Italy 2 GeoExplorer HVSR Version 2 1 0 QUICKSTART 11 SELECT THE WINDOWS WITH THE MOUSE CURSOR CLIKING AND DRAGGING OVER THE SIGNAL WHEN RELEASING THE MOUSE THE SELECTED WINDOWS ARE COLOURED IF THE SELECTION RESPECTS THE LENGTH CRITERIA Signal max min Counts Channel 1 V Scale max min Counts 6016 8192 Signal max min Counts Channel 2 N Scale max min Counts 3817 4096 Signal max min Counts Channel 3 E Scale max min Counts 5150 8192 12 THE RESULTANT HV CURVE WILL BE VISIBLE CLICKING THE BUTTON RESULTS Fe Windows Windows number 0003 Lenath s 2854 30 1 P HAY ratio level Select all Invert Switch one window at Clear Delete atime Signal spectra dB wit 1 pm s HAV calculation Frequency 02 to 20 Hz Number of points 100 V windowing Width 5 x 2 Smoothing bandwidth 40 Frequency Hz Correct spectrum down to 0 01 Hz HAV and spectra plot options z Show ratio Standard deviations V Manual scale s g a Horizontal Iv HAV time HZY rotate Absolute averages ESSI Manual scale 5 HA cunve Other Show single ratio
15. ersion 2 1 0 this page has been intentionally left blank SARA electronic instruments srl Italy Q GeoExplorer HVSR Version 2 1 0 QUICKSTART PACKAGE 1 USB MEMORY KEY 2 AN HARDWARE PROTECTION DONGLE WITH A SEALED RING IDNDICATING THE SOFTWARE SERIAL NUMBER WARNING DO NOT DAMAGE THE RING WITH THE SERIAL NUMBER THE PRODUCT CAN NOT BE CHANGED OR UPDATED WITHOUT THE RING SARA electronic instruments srl Italy 10 GeoExplorer HVSR Version 2 1 0 QUICKSTART INSTALLATION 1 INSERT THE USB MEMORY KEY 2 WAIT FOR THE RECOGNITION OF THE SUPPORT 3 OPEN THE CONTENT AND OPEN THE FILE INDEX HTML 4 SELECT FROM THE LIST THE ITEM GEOEXPLORERHVSR 5 START THE FILE GEOEXPLORERHVSR MSI THIS SCREEN WILL BE SHOWN i GeoExplorer 5 xj Welcome to the GeoExplorer HVSR Setup Wizard e x D e The installer will guide you through the steps required to install GeoE xplorer HVSR on your computer Click Next to continue WARNING This computer program is protected by copyright law and international treaties Unauthorized duplication or distribution of this program or any portion of it may result in severe civil or criminal penalties and will be prosecuted to the maximum extent possible under the law Cancel 6 PROCEED WITH THE INSTALLATION VIEWING AND ACCEPTING THE LICENSE MAKE SURE THE INSTALLATION FOLDER IS C GEOEXPLORERHV
16. ged the value of the cells in the depth column is in fact derived from the height of the layer and the thickness of the bedrock is assumed to be infinite To change the content of a cell without removing the existing value select the cell and press F2 To cancel the edit and restore the content the cell had before the change press the ESC key The content of a cell can be blocked to avoid to accidentally modify it Select the cell and press the space key or click on the cell with the right mouse button and select the Lock cell item from the contextual menu The locked cells are highlighted with a red background To unlock a locked cell you will have to perform the same actions with the difference that the menu item to be selected is named Unlock cell Initially the grid does not contain any layer The Layer Up and Layer Down buttons insert a new layer above or below the row containing the currently selected cell The Remove layer button removes the selected layer The Undo button undoes any change made to the grid both entire rows inserted or removed and the values of the individual cells The Show profile buttons opens the graph of the speeds profile which will be discussed in detail in the appropriate section Generation of the synthetic curve Using the Synthetic curve frame you can generate the synthetic ellipticity curve In the Frequencies fields you can set the start and the end frequencies between which the curve will be calcu
17. ields allows to set the minimum window lengths inserting the lower frequency that you want to reliably analyze T10 frequency according to the SESAME protocol The content of the Length fields will change according to the inserted frequency The three fields on the right allow to indicate channel by channel the amplitude threshold beyond which the signal should be discarded These thresholds are considered if the box Use levels is SARA electronic instruments srl Italy 16 GeoExplorer HVSR Version 2 1 0 checked The threshold positions the green lines on the plot can be moved with the UP DOWN buttons after clicking with the mouse on the plot of interest Wanting more precision it is possible to click with the middle mouse button or the scroll wheel on the point where to set the threshold The Hide levels box operates on the signal display hiding the green lines that represent the thresholds In the same way the Hide selected windows box hides all the selected signal windows The Free selection box if checked informs the program to ignore any length parameter or threshold allowing you to select windows of any length Clicking the Select all button you will select the entire signal the windows will be chosen according to the current settings Pressing the Select all button when the Free selection box is checked selects only one window that covers the entire signal This is not recommended because th
18. it is possible to change the only selected window using the arrow keys on the grid without clicking on the Use boxes SARA electronic instruments srl Italy 9 GeoExplorer HVSR Version 2 1 0 Calculation parameters The H V calculation frame contains the processing parameters Any change in these parameters triggers the recalculation of the H V curve The Frequency boxes contain the minimum and maximum frequencies within which the curve will be calculated while the field Number of points indicates the number of points of the curve chosen with logarithmic spacing The Windowing box indicates whether the windowing operation must be carried out This operation has the purpose to stabilize the calculation of the spectrum and consists in multiplying the signal with an appropriate mathematical function The function applied in this case is known as Tukey window or tapered cosine window The parameter Width indicates the width of the applied windowing in relation to the size of the entire signal window The Smoothing field allows to choose the algorithm used to perform the smoothing of the signal The available algorithms are Konno Ohmachi triangular with a window of constant size and triangular with a window of size proportional to the frequency It is also possible to choose to not smooth the signal The Smoothing bandwidth field adjusts the width of the smoothing window The box Correct spectrum down to indicate
19. it means that the vibrations have a predominant origin from the direction with the colors corresponding to a higher H V level SARA electronic instruments srl Italy 23 GeoExplorer HVSR Version 2 1 0 N 5 k LL Color manual scale Use max color at 70 4 Max H V level 10 Time window length 30 sec Offset 0 sec Persistence plot The persistence plot is obtained splitting the signal into windows of same length regardless of the selection made by the user You can discard a portion of the data from the initial part of the signal The upper part of the persistence plot shows the position of the selected windows in relation to the represented time Clicking on a window with the right mouse button it shows a contextual menu with just one item Exclude window which allows to immediately exclude the window from the processing The Use max color at field indicates to use the color that represents the maximum amplitude to draw all the amplitudes ranging from the maximum to that one corresponding to the maximum amplitude reduced by the indicated percentage This setting allows to better view the low amplitudes especially when there is an amplitude much greater than the others The Color manual scale box together with the Max H V level field have a similar purpose set here the value beyond which all amplitudes are represented with the maximum amplitude color The persistence plot windo
20. lated while the Points field indicates its number of points The Generate button runs the GPELL module of Geopsy to produce the synthetic ellipticity curve corresponding to the current stratigraphy Display parameters In the Plot options frame you can change the display settings of the curves The Frequency manual scale and H V ratio manual scale boxes change respectively the horizontal and the vertical graphic scale The options in the Link frequencies to frame automatically set the horizontal scale so that you can see in full both the experimental and synthetic curves only one of them or just the parts in common The Experimental curve Standard deviation curves and Synthetic curve boxes show or hide the relative curves The Auto plot experimental curve from H V results box indicates whether the experimental curve to display must be the one currently calculated or that one loaded from file if any SARA electronic instruments srl Italy 27 GeoExplorer HVSR Version 2 1 0 Menu items The File Save ground model menu item saves the current stratigraphy in a text file while the File Load ground model menu item loads the stratigraphy from a previously saved file The File Load experimental curve item loads the experimental H V curve from a hv format file The File Exit item closes the window The contextual menu of the stratigraphy grid also contains the Copy grid image to the clipboard
21. nii 30 EN NN 30 30 30 30 30 30 30 30 an Select all Invert Switch one window at Clear Delete a time a 1HOURAAAA HA ratio level H calculation Frequency 02 to 20 Hz Number of points 1000 V windowing Width 5 x lt o Smoothing Proportional triangular Smoothing bandwidth 40 H and spectra plot options Correct spectrum down to Hz v Show ratio Standard deviations Manual scale to HZY time H V rotate Absolute averages z EL Manual scale to dB Show loaded H V curve Other Show single ratios Frequency manual scale to Hz Frequency Hz Frequency 2 44484 Hz H ratio 8 408 1 windows selected SARA electronic instruments srl Italy 2 GeoExplorer HVSR Version 2 1 0 Menu items and other buttons The File Load H V curve menu item loads the H V curve from a hv format file Such format is the same textual format used by the Geopsy software If the Show loaded H V curve box is selected the loaded curve is shown on the chart together the current H V curve The File Save H V curve menu item saves the current H V curve in a file The File Exit menu item closes the window The Windows H V time menu item opens the window with the graphic of the curve persistence You can also open it with the H V time button in the lower left corner The Windows H V rotate men
22. on frequencies beyond those indicated in the H V calculation frame SARA electronic instruments srl Italy 20 GeoExplorer HVSR Version 2 1 0 SESAME criteria check You can select the frequency to be used for the verification of the SESAME criteria clicking on the plot with the left mouse button This frequency can be changed clicking on another point on the plot or using the RIGHT LEFT arrow keys The nine squares placed vertically on the right of the plot give a visual indication of the criteria fulfillment Hovering the mouse cursor over each square and waiting a few seconds a message appears showing the criteria current value and the threshold value The tenth square indicates whether the criteria are globally respected all the three in the first group and at least five out of six of the second group Refining the windows selection It is possible to visually select the windows to exclude from the elaboration holding down the CTRL key clicking on the chart with the left mouse button and dragging it while holding down the button thus selecting a rectangular area All the curves of the individual windows that will fall within the area will be excluded from the processing This function is enabled only when the Show single ratios box inside the H V and spectra plot options frame is checked Windows number 0020 SESAME criteria Col Length Wo e olor ength s X
23. refore will always be free The post sales technical assistance provided to the CUSTOMER will be exclusively linked to the functional characteristics of the product and will NEVER be given about the interpretation and or analytical considerations on the signals In case of theft or loss of the hardware dongle SARA will send a new key to the CUSTOMER at the 20 of the current list price this only upon showing the theft or loss report to the competent authorities This possibility is offered only once during the life of the contract The license is granted for an unlimited period The CUSTOMER accepts unreservedly the licensing terms described above when installing the SOFTWARE SARA electronic instruments srl Italy Se DUAE GeoExplorer HVSR Version 2 1 0 this page has been intentionally left blank SARA electronic instruments srl Italy GeoExplorer HVSR Version 2 1 0 INTRODUCTION GeoExplorer HVSR is dedicated to the seismic signals processing using the HVSR Horizontal to Vertical Spectral Ratio technique The technique allows estimating the relationship between the spectrum of the horizontal components of the signal and the spectrum of the vertical component recorded by a single triaxial seismic station The operation must be performed on different portions of the signal called windows in order to obtain a population of statistically meaningful H V ratios Then computing th
24. rolling allows to horizontally move the signal such as when the slider is used but with a greater detail one sample at a time Scrolling is only effective if the horizontal zoom is active and is useful when the zoom is deep and you want to fine tune the display portion If instead the wheel is simultaneously moved and pressed you will change the signal vertical scale such as using the vertical scroll bars on the right of the signals The function is enabled only when the automatic vertical scale is not active Windows selection To select a portion of the signal and use it as a window for the HVSR processing just click on the signal on any of the three plots with the left mouse button on the point where you want to begin the selection drag and release on the point where you want the window to end The following figure shows a signal where two windows have been selected and a further selection is in progress Signal max min Counts Channel 1 V Scale max min Counts 8132 6016 8192 3808 Signal max min Counts Channel 2 N Scale max min Counts 4096 3817 4096 5840 Signal max min Counts Channel 3 E Scale max min Counts 8192 5150 8192 The selection is made according to the parameters contained in the fields of the Windows selection box The Length fields indicate the minimum and maximum window lengths in second To select windows of the same length set both fields with the same value The 770 f
25. s Frequency manual scale AFTER EVERY NEW WINDOW SELECTION THE HV CURVE WILL BE DINAMICALLY UPDATED SARA electronic instruments srl Italy GeoExplorer HVSR Version 2 1 0 MAIN WINDOW The following figure shows the program main window The menu items and the controls that load and display a seismic signal are highlighted LOADING VERTICAL ZOOM 4_P_SOFTWARE GeoE xplorerH SRAMT_Pila SAF Load windows Length samples 108000 Length 360 Save windows Longitude 0 Elevation 0 LE Counts Channel 1 V Scale max min Counts Signal max min Counts Channel 2 N Scale max min Counts Signal max min Counts Channel 3 E Scale max min Counts 2010 09 23 18 06 15 923 Sample 39978 x3 2010 08 23 18 07 45 919 Sample 66877 Windows selection d Scale all channels Length 30 to 30 sec Use levels WW veces HAV results 10 10 Hz _ Select all Hide levels g H modelling Free selection Hide selected windows HORIZONTAL ZOOM HORIZONTAL SCROLL SARA electronic instruments srl Italy 14 GeoExplorer HVSR Version 2 1 0 Signal loading The File Load signal item of the main menu opens the standard Open file dialog window The program loads seismic files in different formats such as SAF SESAME ASCII format SEG and GSE The boxes at the top of the main window
26. s whether the instrumental correction is active and the lowest frequency it should reach The frequencies below the set one will be corrected with the same factor used for the indicated frequency The instrumental correction option is available only if the response files have been selected in the window shown using the Tools Response files item of the menu of the main window Customizing the display The H V and spectra plot options box shows or hides the various curves and changes the scale both horizontal and vertical The Show ratio box acts on the H V average curve while the Standard deviations box shows or hides the confidence curves The box and fields Manual scale on the left allow to manually adjust the vertical scale of the H V curves The Horizontal and Vertical boxes act on the spectra of the individual components If the box without description on the right of the Horizontal box is selected the spectra of the two horizontal components will be shown separately green line for the N S component magenta line for the W otherwise it will be shown the average of them The box and fields Manual scale on the left allow to manually adjust the vertical scale of the spectra of the individual components The Show single ratios box shows or hides the H V curves of the different windows selected on the signal The box and fields Frequency manual scale act on the horizontal axis scale Obviously it is not possible to extend the scale
27. scale HAV ratio manual scale Min 3 Ma Min 0 12 Link frequencies to Show options Nothing Experimental curve Experimental curve Auto plot experimental curve from H V results C Synthetic curve Standard deviation curves C Common Synthetic curve Layer Up Layer Down Remove layer Show profile E S 2 Frequency Hz Inserting the stratigraphy In the Ground model frame you can insert and edit the information about the stratigraphy that will be used by the program to generate the synthetic ellipticity curve The stratigraphy grid contains the stratigraphic data organized in the following columns H m height of the layer D m layer depth VP m s VP of the layer VS m s VS of the layer SARA electronic instruments srl Italy 26 GeoExplorer HVSR Version 2 1 0 RHO density of the layer Each row of the grid corresponds to a layer the last line corresponds to the bedrock To populate the grid just select the cell you want to edit and enter the desired value any previous value will be overwritten and the outline of the cell will become thicker To stop inserting just move on to another cell using the mouse or the arrow keys or press the ENTER key Note that you can only insert numeric values including the point as decimal separator in the grid cells Furthermore the cells with gray background can not be chan
28. show some basic information on the signal File path full path of the loaded file SPS sampling frequency Length file length in number of samples samples and in seconds seconds Latitude longitude elevation information on the location of the acquisition site In the main window shown above the first plot represents the signal of the vertical component the second one the horizontal component N S and the third one the horizontal component E W When you load files created using instruments of manufacturers other than SARA electronic instruments is very important to make sure the channels are correctly identified in the file and are loaded in the correct order Signal display options After loading the signal the scroll bars on the right of the graphics change the plot vertical scales If checked the box Scale all channels indicates that the vertical scale should vary simultaneously on all the three channels when you operate on anyone of them The box Auto Y scale enables the automatic vertical scale and disables the scrollbars The automatic scaling adjusts the vertical zoom to show the entire signal amplitude in the available space If the option Common is selected the vertical scale will be the same on all the three channels according to the channel which reaches the greater amplitude If the option Per channel is selected the vertical scale will be individually set on each channel based on its own maximum amplitude The
29. u item or the H V rotate button open the window with the graphic of the curve directionality SARA electronic instruments srl Italy p GeoExplorer HVSR Version 2 1 0 DIRECTIONALITY AND PERSISTENCE The directionality and persistence plots allow understanding if the H V curve calculated is generated using signal coming from all the directions and the situation is stable for all the duration of the survey In both plots the ordinate axis represents the frequency and the color indicates the amplitude of the H V ratio as reported by the legend on the right The abscissa axis of the directionality plot represent the direction from North clockwise while the abscissa axis of the persistence plot represent the time The triangular light blue marker present on both plots highlights the frequency selected on the HVSR processing window for the verification of the SESAME criteria ugue w m E IR NAV Rotate N I 5 gt m 90 Azimuth Color manual scale Use max color at 70 Max H V level Directionality plot The directionality plot shows the intensity of the H V ratio calculated using only the selected windows of signal A horizontal band uniformly colored between two frequencies indicates that the vibrations originate with the same intensity from all the directions in that range of frequencies When the coloring of a horizontal band changes
30. w contains two additional controls Time window length to set the size of the signal windows used to generate the plot and Offset to set the initial portion to discard SARA electronic instruments srl Italy 24 GeoExplorer HVSR Version 2 1 0 Any changes made to the windows selection or to the calculation parameters are not applied in real time on the directionality and persistence plots The View Refresh menu item updates the plot based on the current processing status SARA electronic instruments srl Italy 25 GeoExplorer HVSR Version 2 1 0 STRATIGRAPIHC PROFILE MODELLING The H V modelling button in the lower right corner of the main window opens the window that allows to build the model of the stratigraphic profile from the experimentally elaborated H V curve In the figure below the experimental H V or ellipticity curve is represented with a yellow line it can be the one currently calculated or loaded from a file In the same figure the synthetic ellipticity curve green line is calculated and shown according to the inserted stratigraphy Ed czossolorer 22120 oder modula using T 71717 22993 9 12 ei 5 z E 559 2 919 File Ground model Synthetic curve m D m Vp m s Vs m s RHO ka rr Frequencies from 01 to 30 Hz Points 100 Generate 12 12 480 280 0 z gt 12 2000 1200 Plot options Frequency manual
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