See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/302027312 SEISAN tutorial Research · May 2016 DOI: 10.13140/RG.2.1.1139.8005 CITATIONS READS 0 1,767 1 author: Mehdi Maheri Institute for Advanced Studies in Basic Sciences 6 PUBLICATIONS 14 CITATIONS SEE PROFILE All content following this page was uploaded by Mehdi Maheri on 07 May 2016. The user has requested enhancement of the downloaded file. SEISAN Tutorial Mehdi Maheri Winter, 2014 Aims of this class ● Learning some Linux commands ● Physical understanding of seismic phases ● Locating earthquakes with different types ● Calculating magnitude ● Some statistical aspects 2 What is SEISAN ● Seismic analysis system ● Set of programs ● Simple database → Analyzing earthquakes data 3 Why SEISAN? ● It's Open Source software ● It runs under all operating systems Sun Solaris, Linux, MacOSX, windows95/98/NT/2000/vista/7 ● It is simple ● Making a lot of data bank is easy ● With SEISAN it is possible using local and global earthquakes to enter phase readings, locate events, edit events, determine spectral parameters, seismic moment, ... 4 We use SEISAN in Linux ✔ Like Windows, in Linux we have tree style of directories: 5 Linux & commands ● Knowledge about Linux OS ● Terminal ● Commands for navigation: ls & cd 6 ● Open terminal ● Run command “ ls “ 7 Navigate to “ seisan_new “ directory and view it's contains by “ ls “ command ● ● There are directories that we have to work with them. 8 Structure of SEISAN ● In SEISAN we have important directories: 9 Directories description 10 Aliases for seisan There are some aliases command for seisan to make a simple way to navigate in seisan directories. 11 Start! ● ● ● ● There is a data base, see data files. What's the structure of data? It's one earthquake that recorded in many stations, what's the numbers at the end of files? What do IRSC and INSN mean ? Actually, this is simple example of data base and we have always many earthquakes. 12 Seisan commands ● In PRO directory we can see all commands that we use in seisan: Don't touch files in PRO and LIB directories Before modifying any file, make a backup file 13 mulplt: See waveforms ● In WAV directory run command “ mulplt “ and select waveform file Enter waveform file → Press enter → 14 ● In new window press “ o “ to see all waveforms in file ● Click on “ menu “ at top right side of this window 15 Now we can see waveform of earthquake that is recorded in first station ● We can zoom in and out by clicking from left to right and vice versa. ● Press “ r “ to refresh waveform 16 Two important key: f & t ● ● By pressing “ f “ we can go forward and see next traces, to backward we have to press “ shift + b “ (remember: first refresh trace then navigate to forward or backward) Press “ t “ to toggle from single trace to view all trace. 17 ● As said before, this file contains 30 trace, actually 10 station (not always!). Why?? 18 Lets go forward We can select any trace by clicking on it's station name and zoom in. ● Select closest station to earthquake, How? ● We can peak many seismic phase in one trace. Name some phases?! ● Go forward and peak Pg phase: marking it by mouse and pressing “ 4 “ key. For deleting a phase mark it by mouse and press “d” key. (refresh!) ● 19 ● ● Peak some phase in some station Maybe you are tired and want to take a rest! Press “q” to quit from software. 20 Is it OK? ● Now you want to come back and continue working! Do as you learned. ● What do you see? ● Is it OK? ● What does “ mulplt “ do? ● We must register all data and make a data bank for our works! 21 MENU in mulplt ● ● ● ● In MENU we can see one section by name “ Regis p “ in the left side. This section register the file that you choose before. It means that we must run “ mulplt “ for all data files and register them one by one! But there is another pretty good way!! 22 Making data bank ● ● ● You know that waveform files are in WAV directory Initially you must make data bank for requested events. What does data bank mean? 23 Making data bank ● Command that makes a place to keep your work is: “ makerea “ → Enter base name in UPPERCASE ● ● Giving start and end time Time interval depends on your study, don't limit yourself! 24 Don't remember ● ● ● Time interval depends on your study, don't limit yourself! In next step type “ REA “ and press enter to make all directories and s-files of requested events Now we can register our data in seisan. 25 Registering events ● ● First, select waveforms that you want to register by command “ dirf waveform_files “ There is quick way to run one command for many file, Wildcards . What is wildcards?? 26 Registering events ● ● Then enter data base name that you chose in making data base: “ MOSHA “ for this example !!! Important: this name must be same of data base name. Then enter operator name in 4 character. → Operator name 27 eev command ● In this step, seisan command that we should use is “ eev year-month-date “ → ● Everything is OK, now you can start working. Seisan command line ● By pressing Enter you can move between files, examine numbers (1-3). 28 Registering events ● ● To view waveforms type “ po” in seisan command line and press enter. Locate event! 29 View publication stats
