VDC User Manual - Center for Engineering Strong Motion Data
Contents
1. 1 individual traces or 2 all traces for a given station for this earthquake or 3 all traces on this page See Section IV for details on downloading data B Using the Stations Page The Fig 4 is reached using the link at the top of each VDC page As on the Earthquakes page a drop down menu allows you to jump forward to the region of interest or you may scroll down to the appropriate area of the page Within each region stations are listed by the acronym for the station owner or network then by station name To select a station highlight one station Stations within each Region Jump within page to Choose a region z Alaska name then click on the Go p 9 ACOE Moose Creek Dam Alaska my to Station Summary Page ANSS Anchorage Alaska Dowl Engineers Warehouse LJ button at the bottom of the ANSS Anchorage Alaska International Airport ANSS Anchorage Alaska Police Headquarters box displaying the Station ANSS Anchorage Alaska State Fish amp Game SC Alaska Taps Pump Station 07 names Alaska Taps Pump Station 08 PSC Alaska Taps Pump Station 09 Alaska Taps Pump Station 10 1 sc Alaska Taps Pump Station 11 The Station Summar Pa e Alaska Taps Pump Station 12 i is reachable from the Event UA Anchorage Alaska K2 01 z Page any Map or the Select one of the above then Go to Station Summary Page Stations page It displays Retum to top2. The COSMOS VDC User Manual Table of Contents I Introduction II Searching for Data A Using the Earthquakes page B Using the Stations page C Using the Map D Search with Metadata Parameters Basic Advanced III Previewing Data A Acceleration B Response spectra IV Downloading Data Strong Motion Data Files Metadata Parameters SIIRRSSE S Hll ale sla I Introduction The COSMOS Strong Motion Virtual Data Center or VDC is affiliated with COSMOS the Consortium for Strong Motion Observation Systems a consortium of government agencies private organizations universities and private individuals who have a common interest in promoting earthquake safety and education The VDC s role in promoting safety and education is to provide easy and free access to strong motion earthquake data from a large and growing number of sources The data are available for download as text files containing raw as digitized acceleration recordings processed acceleration velocity displacement and Fourier and response spectra though not all for each earthquake especially older ones You may also download tables of metadata parameters such as peak ground acceleration and s wave velocity for all stations reporting a given earthquake The VDC has various interfaces which allow you to select data by earthquake by recording station via a map interface or by searching metadata parameters You may also preview the acceleration and th
3. data Once you log in you are redirected to the Download Bin page but the page now shows buttons for each downloadable file as shown in Fig 17 When there is a long button with multiple data types listed it means that all of those are bundled in the same file as is true for the Parkfield data from CSMIP below When there are multiple buttons as for the USGS data it means that each of these exist as a separate file Download Bin About Zipping data Zip the checked files y Start over with a new bin Earthquake California Strong Motion Instrumentation Program stations Parkfield Parkfield Ground f ey ee ee een mee 1a CAD 09 IICA a m Oooo Acceleration Velocity Displacement Fourier Response _ uTo eT Ed Z A level aul one 3 gt Eas l ii U e a A O a 3 A ra E eS a s W m fs ce w Uncorrected _ Acceleration _ Velocity L Displacement _ Fourier Response _ i eee oo 5 Tote co Eee oo Bees oo a coo ges eo Uncorrected _ Acceleration _ l Velocity Bie Displacement O f Fourier Response p Uncorrected z Acceleration G Velocity O Displacement C Fourier O d Response 5 H Return to an old bin bins kept for six months 1 2005 06 26 10 13 27 863444 T trace s 2 2005 06 23 06 31 20 479723 1 trace s 3 2005 06 22 06 16 56 166979 1 trace s Fig 17 Downloading Files from the Download Bin Individual files If you click on
4. metadata on this station and all of the earthquakes Fig 4 The Stations Page recorded by this station As on the Event page ANSS Anchorage Alaska you may click on View Dowl Engineers Warehouse Map to display on a Agency Number 8024 clickable map symbols Longitude 149 8853 for this station and all of jee es the events listed on this Se ee ee ce page Following the link to the Summary page for this earthquake directs you to the C Add all data on this page to the download bin Go to Download Bin View Map Oo Nenana Mountain Alaska 2002 10 23 1127 UTC H tral dist 280 1 km corresponding Event iii Summary page for this earthquake Plot Acceleration page Spectra Log Lin Add this station record to the download bin Component Up PGA cmis s 3 40 PGV cm s 0 80 C Add this to bin Fr om th e S t a t 1on Component 90 PGA cm s s 6 50 PGV cm s 2 40 M Add this to bin Summary page you may Component 360 PGA cmis s 7 00 PGV cm s 2 40 Add this to bin also preview the data using the Plot Acceleration and Log and Linear spectra plot links Please see Section II for details smp N Return to top Go to Bin Fig 5 The Station Summary Page You may select from this page all traces on the page all traces for a given earthquake or individual traces to be added to you Download Bin for downloading See Section IV for further details on downloading C Using the
5. previous page Component Up Ground level PGA 372 28 cm s s Period i 71 ag aol d 10 i a z pa T a a a E z 5 g p m i rT a E z t 2 10 S Pa Fig 11 Configuration Header and Acceleration from the Logarithmic Response Spectra page Logarithmic The page that displays the logarithmic scaled response spectra allows you to choose from the available damping values units for displaying the acceleration and the maximum period plotted as shown in Fig 11 Default values are 5 damping cm s s for the units and the maximum period available in the file 13 enone Linear The linear scaled Station Parkfield CA Fault Zone 3 Reconfigure Plots response spectra plots are eee Owner California Strong Motion Instrumentation tein mary Station Latitude amp Longitude 35 8030 120 3340 de signed e specially for Earthquake Parkfield CA 2004 09 28 1715 UTC iii jiii at en gineers In addition to picentral Distance 3 9 km Max Period 5 sec Processing Info CSMIP t the options available on Scale Factor for Data 1 Use the back Se to return to the Cala iat the Logarithmic version you may scale the data UBC 1997 Help T and configure a design S spectrum and overlay it O IBC 2000 or Ground motion Help Over the response iii spectrum Sp Generic design spectrum Help Max 2 5 Fy r a aaan Up PGA 372 28 cm s s pectral Acceleration
6. the buttons with the data type listed on them your browser will display the file on the screen and you may then save it on your own disk Multiple files If you click on the Zip the checked files button at the top left of the page the VDC will collect these and zip and tar them for delivery as a one or more compressed files with up to 30 data files per compressed file You may uncheck any files you do not want to download before clicking on the Zip the checked files button These zipped files will also contain a file with a list of the Internet addresses whence these files were accessed Warning If you receive a message that the zip file you have downloaded via Netscape is corrupted use another browser or reset the zip file extension to tgz Netscape sometimes adds an additional tar extension to the name Previous Searches Note that below the Download Bin is a list of links to previous searches referenced by date and including the number of traces from each search Clicking on one of these links will restore the Download Bin for that day s searches to the screen In that case your current search will be stored under the current date Metadata Parameters To download metadata parameters see Section II D above The Advanced Search under Search with Metadata Parameters 17
7. 005 06 12 1542 UTC If you click on the link Region South Californi 1 Event Latitude between 90 amp 90 33 5330 Dig Summar Pa for this E L itude be 180 amp 180 116 5780 en Bed ceed ike Station you will be Pref dM itude 5 2 Moment Magnitude 5 2 directed to a page that Local Magnitude 5 6 is Mechanism strike slip gives further metadata References l l for that station ump within page to T Choose a Station including if available the owner s station page as well as all earthquakes that this station has recorded C Add all data on this page to the download bin Go to Download Bin View Map O Anza CA Tripp Flats Training Camp Hypocentral dist 23 0 km USGS station 5222 P i USGS Arapa corrected acceleration velocity amp displacement Fr om the Event p age Summary Page for this Station Plot Acceleration e Spectra Loa Lin you may also preview C Add all of this station s data to the download bin Go to Bin the data using the Plot Component 360 PGA cmis s 498 00 PGV cm s 9 75 M Add this to bin Acceler ation and Log Component 90 PGA cmis s 546 00 PGV cm s 13 30 C Add this to bin and Linear Spectra plot Component Up PGA cmis s 284 00 PGV cm s 5 01 Add this to bin links Please see Section II for details Fig 3 The Event page From the Event page you may also select to be added to your download bin for downloading the data files
8. Event page doesn t show S Wave Boe velocity you won t see the actual value Region Parameters Option 2 returns an html table of actual values for all fields you selected on the Advanced Search page and meeting the criteria of L Station Name the fields for which you entered Z Location constraints When values are missing in the database there will be an empty cell in the table __ California Geology S wave Velocity Top 30m m s Station Parameters eee Option 3 returns the same Owner station page uri information as the second option but as a tab delimited file If you save the browser page that is returned as an RTF file you can import it into Excel or a database J Fig 8 Part of the Advanced Search page For the second two options you should choose all fields for which you want to receive data even if you are not going to use them to narrow the search For example if you want to find all of the stations at the Parkfield 2004 09 28 earthquake with PGA gt 100 cm s s you will want to select peak ground acceleration and earthquake name or date to 10 allow you to narrow the search to that earthquake and establish a range of PGA values but you also might select station location auxiliary location station latitude and longitude so that you can see what stations you have selected Advanced Parameters Page After selecting fields of interest from this Advanced Sear
9. Map ou can reach the World Map using the links at the top of each page or you can reach a subset of the map from the map links on Event or Station summary pages When you enter from the eee ines 10000 km Event or Station ations Summary page and are requesting information for a California or Enter new latitude and longitude ranges Nevada earthquake Or Latitude 60 00 to 79 00 station the site 9 automatically selects a Create New Map Reset Coordinates more detailed map showing fault lines Click on the map to zoom in or to select a station or earthquake Zoom Out Longitude 180 to 180 Number of earthquakes shown 500 You may use the map in several ways Fig 6 The World Map 1 Enter Latitude and Longitude If you know the latitude and longitude ranges you may enter those in the box below the map and then click the Create New Map Maps do not display less than 1 5 degrees however 2 Click on an Icon If you click on a given icon solid diamond for earthquake and open box for station and you will be directed to the corresponding Event page or Station Summary page 3 Click on open space You may click on any area of the map not covered by an icon The program zooms in and draws a new map centered on the point you clicked You may reverse this by clicking on the Zoom Out button Since maps are generated dynamically there may be a slight delay in response 4 Click on an earthq
10. PGA ce S gt Fig 12 Linear Response Spectra page The Help links next to the design spectra choices show plots describing the corresponding input variables as shown in Fig 13 Hax 2 5 C T C Hax To 86 2 T Spectral Acceleration tg m a Period t seconds Fig 13 The Design Spectra help plot for the UBC 1997 standard 14 IV Downloading Data Strong Motion Data Files Find data to download To download data files through the VDC you must first select them using one of the search mechanisms described above The results of your search will be displayed on one of three pages the Event page the Station Summary page or the Station Event page as shown in Fig 14 On each of these pages there are 3 areas from which you may select files to download 1 the Add all data on this page checkbox on the left near the top of the page 2 the Add all of this station s data checkbox on the left above the individual component descriptions and 3 the Add this to bin checkbox on the right of each individual component Check whichever is appropriate for your interests then click on the Go to Download Bin button near the top of the page or one of the Go to Bin buttons on the right of each station block Anza CA 2005 06 12 1542 UTC Reglon Southern California Event Latitude between 90 amp 90 33 5230 Event Longitude between 180 amp 180 115 5780 Event Depth km 14 10 Pre
11. a list of stations with links to their respective Stations Summary pages with their latitude longitude and distance Fig 7 Basic Search page showing parameters that will be returned Earthquake only You may also choose to return only earthquake information For example if you enter Parkfield into the earthquake name and nothing else under the default condition you will get a list of all stations for all Parkfield quakes listed in the database but if you select the button for Return earthquake information only you will receive a list of just the earthquakes whose names include the string Parkfield with links to the Event pages for those earthquakes Station only if you choose the Station only option the page will return a list of stations with latitude longitude and distance similar to that returned if you have selected more than 60 stations This is a quick way to see what stations are available for an earthquake Potential Problems Incomplete data not all parameters are present for every trace registered in the metadata database e g earthquake mechanism and closest distance to the fault are not present for all traces Currently only about 1 4 of the earthquakes have a mechanism listed and about 1 5 have closest distance to the fault Therefore if you choose these you will only be selecting from the set of traces for which those values have been entered into the database Event name The search compar
12. ce pga pov hypocentral distance Clickable Map response spectra at 1 3 1 3 sec 5 of all stations damping and events from calling page Station Event Page Event Page Display all stations for this event this station region region name station location date station owner data owners no of stations Stations page Earthquakes page Fig 1 VDC Search Options A Using the Earthquakes page You can search by earthquake in several ways but perhaps the easiest is on the Selecting a region at the top of this page will get you to the appropriate earthquake list more quickly or you can scroll down to the region you are looking for Earthquakes within each Region Jump within page to Choose a region Alaska Earthquake most recent event Is first Magnitude Stations Owners Zip archives Nelchina Alaska 2004 08 25 0222 UTC oud My a USGS USGS cor Rampart Alaska 2003 04 02 1639 UTC 5 0 ML 1 USGS USGS cor Denali Alaska 2002 11 03 2213 UTC 7 9 My ACOE ANSS APSC UA USGS APSG unc USGS cor Nenana Mountain Alaska 2002 10 23 1127 UTC 6 7 My 38 ANSS AFSC UA USGS USGS cor Fig 2 The Earthquakes page Earthquakes within a given region are listed in order of date most recent first Also listed are the preferred magnitude the number of stations for which there are data files the owners of that data and optionally a set of links to compressed collections zips of files for that earthquake This is a
13. ch page you are directed to the next page the Advanced Parameters page which has text boxes or drop down lists for all of the fields Again you only need to fill in values for fields that you want to constrain If a field has minimum and maximum values you do not necessarily have to enter both You might for example enter just the minimum if you are only interested in earthquakes with a magnitude gt 6 For dates however there are default values as shown and so both beginning and end date are required if you choose that field All dates and times for searches are UTC At the bottom of the Advanced Parameters page are buttons for the 3 types of output you can generate from the Advance Search see above Potential Problems See the Simple Search section above for potential problems related to earthquake name and incomplete data Station identification Station name refers to a station code usually 3 4 characters used for some older stations Agency Number is the code assigned by the owner usually a 5 digit code for CGS or USGS stations If you want information on the city state or country choose location instead The name of a dam will also be listed in the location field Auxiliary location is a general field that may include building name or street intersection e g Hollywood amp Vine geotechnical array name e g Lake Hughes Array 4 or description e g fire station airport hospital Geology Geology is a text field
14. e response spectra before downloading the data files The VDC does not provide access to all recorded earthquake data Intended primarily as a resource for earthquake engineers seismologists risk assessment professionals and others concerned with the effects of damaging earthquakes the VDC is restricted to strong motion data principally from earthquakes of magnitude 5 0 or larger in earthquake prone areas and 4 5 or larger in other areas Nor is the data available in real time most data are reviewed by station owners corrected to bring the mean value to zero and band pass filtered Using feedback from users and from semiannual meetings with the COSMOS VDC Working Group we continue to improve the VDC in order to enhance its value to the user community We encourage you to submit recommendations for enhancements The COSMOS VDC gratefully acknowledges the NSF CMS 0201264 the USGS the California Geological Survey the Southern California Earthquake Center and COSMOS for their support and continued oversight and the continuing valuable support of the many agencies and organizations that have made their data available for your use We urge you to keep in mind that the data you obtain through the VDC is provided through the generous support of these data providers If you use any data for research that results in a publication please cite the owners of the data and the COSMOS VDC Starting out The web site for the VDC is fattp db c
15. es the entire string entered to the earthquake name as it is listed in the database the earthquake list on the Earthquakes Page contains the name as it exists in the Cosmos database Note that this name includes the date in UTC time e g Parkfield CA 2004 09 28 1715 UTC The search does not work like Google where you can enter separate words and it will search for them independently Spaces are also part of the search string so if you put in an extra space you won t get the results you are expecting The best strategy is to choose the shortest string that will cover the earthquakes you want e g palm instead of palm springs It is also better avoid any punctuation or accent marks Names are not case sensitive Station identifier This initiates a search of several fields in the database including ones that contain the city state country if not U S building name address and owner s station code for the station For example you may be able to find the station you want by entering just the street name You may also enter words to generate searches for structure type like dam or array to find dams and geotechnical arrays and bldg or story to find buildings not all buildings have number of stories listed and not all buildings have bldg in the name so you might want to try both Earthquake magnitude This initiates a search of the preferred magnitude field usually the one reported by NEIC whethe
16. f Fig 9 Choosing to Preview Data on the Station Summary page Acceleration Station Parkfield CA Fault Zone 3 Station Owner California Strong Motion Instrumentation Program Station Latitude amp Longitude 35 8020 120 3340 Earthquake Parkfield CA 2004 09 28 1715 UTC Epicentral Distance 3 9 km Use the back button on your browser to return to the previous page Component Up Ground level CH Sec sec l oo lint g 15 seconds Fig 10 Acceleration plot 12 B Response Spectra You may preview Response Spectra by choosing the Log or Lin link for logarithmic or linear scaled plots respectively on the Events page the Station Summary page or the Station Event page as shown in Fig 9 Currently only data processed by the owner is available as response spectra approximately 1 2 of all files available through the VDC Both versions of the Response Spectra plots show spectra for acceleration velocity and displacement for each sensor at the selected station Response Spectra Station Parkfield CA Fault Zone 3 Reconfigure Plots station Owner California Strong Motion Instrumentation ee Program m Damping 35 Station Latitude amp Longitude 35 8030 120 3340 Accleration Units cm s s Earthquake Parkfield CA 2004 08 28 1715 UTC E Epicentral Distance 3 9 km Max Period 12 sec Processing Info CSMIP Redraw Use the back button on your browser to return to the l
17. ferred Magnitude 5 2 Moment Magnitude 5 2 Local Magnitude 5 6 Mechanism strike slip References Jump within page to _ Choose a Station C Add all data on this page to the download bin Go to Download Bin J View Map ol Anza CA Tripp Flats Training Camp Hypocentral dist 23 0 km USGS station 5222 Processing by USGS Data Available corrected acceleration velocity amp displacement summary Page for this Station Plot Acceleration Spectra Log Lin Add all of this station s data to the download bin Go to Bin Component 360 PGA emisis 498 00 PGW cm s 9 75 C Add this to bin Component 0 PGA emisis 546 00 PGY cm s 13 30 C Add this to bin Component Up PGA cmi si s 284 00 PGV cm s 5 01 C Add this to bin Fig 14 Selecting Files to Download from the Event page 15 Review selections When you select one of the Go to Download Bin checkboxes from a search result page you are directed to the Download Bin shown in Fig 15 From this Download Bin Proceed to download data Start over with a mew bin California Strong Motion Instrumentation Program stations Parkfield CA 2004 08 28 1715 UTC Parkfield CA Ground level Faut zome 3 Fig 15 The Download Bin page you may delete unwanted files using the Delete links at the right or delete all files from this selection by clicking on the Start over with a new bin link Once you are satisfied with the selection click on
18. into which the VDC has placed whatever the recording station has offered for a description of site geology so sometimes you might see deep alluvium and other times you might see a NEHRP code As a consequence it is not very useful as a search parameter but still may contain useful information Use S wave velocity at 30 m instead for a search parameter Text fields enter the shortest possible string that matches the data you want and don t use punctuation or diacritical marks Do not use characters to represent wild cards like Numeric Fields Numbers use American notation and are entered without commas Do not include other symbols e g gt or lt or units in the numeric fields 11 III Previewing data A Acceleration You may preview time series acceleration plots from the Events page the Station Summary page or the Station Event page by selecting the Plot Acceleration link on one of these pages as shown in Fig 9 The acceleration plots are currently only available in cm s s scaling Parkfield CA 2004 09 28 1715 UTC Closest dist to fault 2 1 km Summary page for this earthquake Plot Acceleration Spectra Log Lin C Add this station record to the download bin Component Up PGA emisis 372 28 PGV cm s 11 51 C Add this to bin Component 90 PGA emisis 363 31 PGW cm s 22 49 C Add this to bin Component 300 PGA emisis 382 46 PGW cm s 19 70 C Add this to bin Reium to too Go to Bin
19. osmos eq org Notice the links at the top of the VDC home page which are repeated at the bottom of the page These links to various search interfaces and informational pages are on every VDC page so you can quickly navigate around the website Note too the links to the which provides information about COSMOS activities and publications and the Frequently Asked Questions page which may answer questions that crop up in your use of the VDC II Searching for Data There are multiple ways to search for data through the VDC and each is interconnected as shown in Fig 1 You may for example search for all of the stations for a given earthquake use the results displayed on the Event page select one of those stations then go to the Station summary page which displays all the earthquakes which that station recorded Or you may use the Clickable map to find all stations and earthquakes within a given area then select successively each of the events and stations contained on it to go to their respective Event and Station Summary pages Search Page Advanced Search Page earthquake name Event name date mechanism latitude longitude depth station name location strike dip rake magnitude range magnitudes mechanism pga range Display all stations Station name location hypocentral distance and earthquakes that s wave velocity geology data owner match search criteria Instrument latitude longitude type placement owner s code Tra
20. quick way to download a number of files at once if you want all of the files for an earthquake Currently only files distributed by the USGS and the two Japanese networks K Net and Kik Net are available as zip files but we are planning to add zips for all Cosmos housed data soon The suffixes cor and unc refer to corrected and uncorrected data Earthquake Name The earthquake name as it is stored at the VDC is listed on the left This may not be the name with which you are familiar so the date and time are part of the name Later if you want to search by metadata parameter you will want to use this text string or a subset of it if you want to enter a value for earthquake name Clicking on the earthquake name will direct you to the Event page which displays all of the stations available for that earthquake along with earthquake metadata The Event Page The References link on the Event page will take you to a page listing sources for earthquake metadata links to on line shakemaps or moment tensor solutions or other information of interest about the earthquake Below the earthquake source parameters is a drop down list of stations on this page This is a Short cut for going to a particular station of interest If you click the View Map link you will see all of these stations and the earthquake displayed as symbols on a map California earthquakes and stations are displayed on a map that also displays known fault lines Anza CA 2
21. r it is moment surface local or some other magnitude e g body wave duration but not seismic moment in that order of preference Since these values are sometimes revised over time be sure to enter a range of values large enough to cover the ones you are interested in The database only contains a few earthquakes with magnitudes lt 4 5 The Advanced Search The Advanced Search page allows you to search virtually all of the parameters stored at the VDC and returns results in three different formats 1 A Station Event page just like the result returned from the Simple Search 2 An html table of all parameters selected and matching those for which you entered values 3 A tab delimited table of all parameters selected and matching those for which you entered values Option shows all of the stations that met the criteria selected but Select the database parameters that you wish to search on Search Help Note Parameters marked with an asterisk may not be present for all traces not necessar ily what tho Se values Event Parameters are Event Latitude between 30 amp 90 For example if you select S wave C Event Longitude between 180 amp 180 velocity at 30m available for C Event Depth km about 1 2 of all stations and enter C Preferred Magnitude some range of values it will Advanced Search Choose Parameters return the stations that meet those 5 Local Magnitude criteria but since the Station
22. rrow the search Closest Distance to Fault km from Note Not all records wil nave this value Hypocentral Distance km from Return earthquake station and accelerogram information Return station information only _ Return earthquake information only Station Owner O Any F e For example there is no point in cau enter a min and max magnitude Se on Seman of O and 10 respectively since that would cover all earthquakes Advanced National Seismic System Alyeska Pipeline Service Co cD pD Ce Oi Bogazici University Kandili Observatory Turkey Canada California Division of Water Resources Central America O California Institute of Technology z China 3 California Strong Motion Instrumentation Program 3 Eastem and Central United States in the database When you have Centro de Investigaciones Geotechnicas Greece entered the values you wish _ Department of Geophysics and Geodesy Santiago Crile J Hawai kR Dept of Earthquake Eng Indian Inst of Technology Roorkee India 3 click on the Search button at the Geological Survey of Canada O G IRIGM Universite Joseph Fourier Grenoble France A bottom of the page Full information default The default search returns an html page similar to the Event or Station summary page but showing all earthquakes and all stations that matched the conditions you entered If the search returns more than 60 stations you will just see
23. the Proceed to download data link User Login Before proceeding to the download bin please log in mall address F Log ind The email you provide will be used to send you announcements of new data available through the COSMOS VDC and a quarterly newsletter To unsubscribe from these lists reply to the email with the subject line set to UNSUBSCRIBE NEW or UNSUBSCRIBE NEWSLETTER respectively You may resubscribe by sending an email to webmasteriidb cos mos eg org with the subject line set to SUBSCRIBE NEW or SUBSCRIBE NEWSLETTER Fig 16 The User Login page Log in Next you are directed to the User Login page shown in Fig 16 You must enter your email address and then click the Log In button The VDC does not sell or give away any information you submit here but does use this email to issue New Event notices and in some cases the VDC has used these email addresses to advise users that data recently downloaded by them has been modified You may opt out of the New Event notices at any time by returning a New Event notice with Unsubscribe New in the title or writing to webmaster cosmos eq org You will notice that you may also go directly to the Login page from the links at the top of the page Once you have submitted an email address your search list is preserved for 6 months If you leave the site and return you may log in with that same email address and recover the results of previous searches 16 Download
24. uake name If you are displaying a map that shows fewer than 50 earthquakes these earthquakes will be listed below the latitude and longitude box Clicking on the earthquake name will direct you to the corresponding Event page Clicking on the highlight button next to the earthquake name will redraw the map and highlight the corresponding earthquake and the stations that record it in a different color D Search with Metadata Parameters There are two types of searches available the Basic Search and the Advanced Search both accessed via the links at the top of the VDC pages The Basic Search Basic Search To search on database parameters not found on this page use the advanced search Search Help Note Leave blank any fields that do not apply to your search Event Name e g North Palm Springs Station Identifier Station location or number assigned by the station owner Earthquake Mechanism Note Not all earthquakes will nave a Known mechanism Enter minimum and or maximum values Earthquake Magnitude from Peak Ground Accel cm s s from he Basic Searchjis a way to quickly search by the most commonly used parameters You can select using earthquake name mechanism and magnitude station owner hypocentral distance and closest distance to the fault instrument peak ground acceleration and region You do not need to enter values for all of these options only the ones on which you want to na
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