User's Guide for Program AFT.
Contents
1. Abs E lt Tal Here the constant Tal is specified by a user 2 3 Limitations as function of M We consider main shocks in magnitude range M lt M lt M2 This interval can be subdivided into intervals by k points c M lt c lt lt Ck lt Moa Limitations of type Abs on magnitude depth distance and time namely Mal Ma2 Hal Ha2 Ral and Tal may be common notation Mono for all M or be different notation Poly for different intervals For example consider the following limitations on Ma for M co lt M lt c z Mal 1 lt M lt Ma2 1 for o lt M lt o Mal 2 lt Ma lt Ma2 2 eeoeerentarueseeveseeroneneoertreeveneoenearaeueveese for Ck S M lt Ck 1 Mo Mal k 1 lt M lt Ma2 k 1 Here ci ci 1 are magnitude intervals with different limitations and Mal i Ma2 i are corresponding limits The number k of points of division should be less than 10 2 4 Menu Control window in this window means some inconsistence in the selected values of the parameters If there is OK in the window one may finish parameter selection Enter the Control window to get explanations in the first case or to start execution in the second Type window In this window one may select whether full amount of information will be displayed during the program execution Type ON or just the necessary minimum Type OFF Print and Protocol windows If in the Print window you2. current window is highlighted It can be entered to change values Some windows can be opened to enter the next level menu The headers of such windows are enclosed in brackets e g lt Magnitude gt e To move cursor around the screen or inside the windows use arrows Home End PgUp and PgDn keys e To enter current window press Enter e To accept value s in the window and to leave the window press Enter If cursor remains in the window it means that selected value is of wrong type or out of range e If you do not need some parameter of the string type replace it by i e press SpaceBar in that window e To open the window and to enter the menu of the next level use function key F2 To select files use F9 To abort the program use F10 The keys which can be currently used are shown in the bottom line of the screen e To accept all the values in current menu and leave it returning to the previous level press Esc When it is possible the hint Ese Exit appears at the bottom of the screen e In some windows values can be toggled by pressing or In this case will appear in the bottom line of the screen 1 3 PROFILE file The set of selected values of parameters can be stored in a separate file called here profile The parameters are rather numerous since the program is flexible and offers a wide variety of possibilities At the same time some computations may differ only in few parameters while the
3. rest remain the same A profile is created in order to avoid the repetition in choosing the values of the parameters Default values of parameters will be suggested if you do not use any profile Several profiles may exist under different names However the extension of a profile should be AFT Il DESCRIPTION OF THE PROGRAM 2 1 Introductory notes As mentioned above the input of the program is a catalog of earthquakes in the standard 20 bytes format Output is a catalog of main shocks It is stored on a disk in the same format In the catalogs of main shocks created by the program AFT mb is magnitude ms is the number of aftershocks divided by 100 ml mp 0 The names of the catalogs should have the extension DAT Optional printout file has the name AFT PRI The program separates earthquakes into main shocks and aftershocks Everywhere in these notes M is the magnitude of the main shock An earthquake 1s identified as an aftershock of a preceding main shock if the following conditions are satisfied e its magnitude does not exceed M e the distance between their epicenters does not exceed R M e time difference does not exceed T M e modulus of difference in depth does not exceed H M Here 7 M R M and H M are empirical functions If the conditions are satisfied for several preceding main shocks the earthquake is assigned to the latest among the strongest main shocks For details of this definition of aftershocks see K
4. select value ON then the file for printout will contain complete output If you select OFF in the Print window then you have an option to create a smaller printout with information about the set of the selected parameters To do this choose the value ON in the window Protocol The program selects from the input catalog a subcatalog for which the separation of earthquakes into main shocks and aftershocks is carried out This selection is determined by the time magnitude and depth intervals and the area The time interval is determined by windows Time from and Time to Definition of the input magnitude is made by window lt Magnitude gt The following options can be selected in this window mb ms ml mp the magnitude mb ms ml mp will be chosen only from input catalog without any transformation Limitation for the selection has to be specified for this magnitude only by entering using function key F2 the menu of the next level common common magnitude M is calculated in one of the following ways a M max f mb flms fm fimp b M min f mb f ms fim fmp c according to priority in sense of specified preferences For example suppose the priority is mb mp ml ms Then M f mb if mb is not 0 M f mp if mb 0 and mp is not 0 M f ml if mb mp O and ml is not 0 M f ms if mb mp ml 0 and ms is not 0 Another example if priority mb mb mb mb is indicated then the program deals with input magnitude mb only H
5. Ninth Workshop on Non Linear Dynamics and Earthquake Prediction 1 13 October 2007 User s Guide for Program AFT A Soloviev International Institute of Earthquake Prediction Theory and Mathematical Geophysics Russian Academy of Sciences 84 32 Profsouznaya st Moscow 117997 Russian Federation www mitp ru I COMMON NOTATIONS The program is written in Turbo Pascal and C for PC compatible computers It is intended to be used for e identification of main shocks and aftershocks in a catalog e creation of a catalog of main shocks The programming skill is not required from users Some experience with computers would be helpful To users The program is modified from time to time according to the experience of its applications Any suggestions or information on results obtained will be kindly appreciated Please send both to Dr A A Soloviev International Institute of Earthquake Prediction Theory and Mathematical Geophysics Russian Academy of Sciences 84 32 Profsouznaya st Moscow 117997 Russian Fedration Phone 7 495 333 45 13 Fax 7 495 333 41 24 E mail soloviev mitp ru 1 1 Catalogs The program operates on catalogs of earthquakes stored as non text binary files i e the so called MITPAN standard 20 bytes binary format see description below Records in a catalog should be ordered by ascending time Catalogs in this format can be prepared from data reported in other formats by using CompiCat http www mitp r
6. eilis Borok V I L Knopoff and I M Rotwain Nature 1980 283 259 263 For each main shock the following statistics are given in the printout e The number of aftershocks b e i during the time interval e z after the main shock here e 1 lt e 2 lt lt ey lt TM j lt 5 e The weighted sum Sigma sg counted for these aftershocks The value of b e 1 divided by 100 is recorded in ms position of the output catalog After a strong earthquake i e main shock with M gt Mo the count of b e i and sg is terminated for all preceding main shocks However the identification of aftershocks is carried on 2 2 Parameters for definition of aftershocks Limitations on magnitude of the aftershock M may be of the following types Abs Mal lt M lt Ma2 Rel M dM1 lt M lt M dM2 No no limitation Here M is the magnitude of the main shock and the constants Mal Ma2 dM1 dM2 are specified by a user Limitations on depth of the aftershock H may be of the same types Abs Hal lt dH lt Ha2 e Rel H dHI1 lt H lt H dH2 e No no limitation Here H is the depth of the main shock and the constants Hal Ha2 dH1 dH2 are specified by a user Limitations on the distance R between epicenters may be of the types Abs and No only e Abs R lt Ral e No no limitation Here the constant Ral is specified by a user Limitations on time T between the main shock and its aftershock may be of the type Abs
7. ere f m A m B values of the coefficients in fmb Ams Aml and f mp may be different Method Max Min Priority of calculation of the common magnitude has to be specified in window Select by entering using function key F2 the menu of the next level The coefficients A and B for recalculation of magnitudes and limitations Magn from Magn to for the common magnitude are specified in the same window The depth interval is determined by windows Depth from and Depth to Area for selection of earthquakes lt Area gt The program selects the earthquakes with epicenters from an area specified in geographic coordinates The boundaries are included This area can be Rectangle lt Area gt Rectangle Rectangle is specified by the intervals of latitude and longitude It may cross longitude 180 lt Area gt Polygon Over Polygon lt Area gt Polygon Polygon is specified by coordinates of its vertices their total number should not exceed 20 and should not contain a pole It may cross longitude 180 lt Area gt Rectangle Over If a rectangle or a polygon crosses longitude 180 then it should not cross longitude 0 Coordinates of an area have to be entered in the next level menu Open window lt Area gt to view and change them In the Polygon option program allows to view it by pressing F8 The value of Sigma for each main shock may be displayed during execution of the program Type Sigma ON One may limit the d
8. isplaying of the main shock to those with the number of aftershocks exceeding some threshold Min Number To set all the parameters for aftershock selection and identification described above move the cursor to the window lt Functions gt and press Enter or F2 Specified value s Window Number of magnitude intervals k Number of Lines Mi C1 C2 Ck Mo Interval boundaries of magnitude intervals c d and f for calculation of Sigma c 10 c d f Mo Strong For each magnitude interval Mal Ma2 dM1 dM2 Magnitude Hal Ha2 dH1 dH2 Depth Ral Distance Tal Time e l e 5 Timel Time5 time interval boundaries
9. u soft ecp doc mainindex html Each earthquake in the catalog is described by a vector T LA LO DEP mb ms ml mp where T is the origin time LA and LO are latitude and longitude of the epicenter in degrees and decimals Western longitude and Southern latitude are negative DEP is the focal depth in kilometers mb ms ml mp are four magnitudes 0 usually corresponds to unknown value of magnitude The records in a file with the catalog are specified as follows The first 4 bytes of the first record contain an integer which is the total number of records in the file the number of earthquakes plus 1 For all other records time of the earthquake in minutes A D oo rq latitude degrees multiplied by 100 integer 2 longitude degrees multiplied by 100 integer 2 depth km integer 2 magnitude mb multiplied by 100 integer 2 magnitude ms multiplied by 100 integer 2 magnitude ml multiplied by 100 integer 2 magnitude mp multiplied by 100 integer 2 macroseismic intensity integer 2 not used usually in these programs The earthquakes in a catalog should be in ascending order by time 1 2 Menu The program has the user interface based on the window menus We call a menu a set of windows on a screen Each window is a box with a header and with one or several values inside A value may be numerical logical or text variable User can move around the menu and select any window he needs The
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