AS-1 Teaching Modules 1



Larry Braile

Professor, Purdue University

September, 2010


AS-1 teaching modules status -- modules have links below (htm, doc and pdf formats):


1.  Using AmaSeis:  Using the AmaSeis seismogram viewer and downloading seismograms from the Internet – A Tutorial (This is primarily a resource for using the AS-1 seismograph and the AmaSeis software.)




2.  Accessing Earthquake Information:  Using the Internet to access information about earthquakes (a tutorial, includes examples of earthquake catalog searches and online S minus P location mapping).




3.  MagCalc:  Earthquake Magnitude Calculator for the AS-1 Seismograph (This is an online tool [and resource with examples] for calculating magnitudes from AS-1 seismograms.)




4.  Calculating Magnitudes: Calculating Magnitudes from AS-1 Seismograms (Electronic Version)  (Instructions, data and examples of calculating magnitudes with AS-1 seismograms.)




5.  EQ Location and Magnitude Calculation: Earthquake location using the S minus P method and magnitude determination (Lesson and data for earthquake location using the S minus P method and magnitude calculation for AS-1 seismograms.)





6.  How Often?:  How often do Earthquakes Appear on the Seismograph?  (Explores the question of how often should one expect to see events on the AS-1 seismograph and how often earthquakes occur.  Examples of how often large events occur and analysis of earthquake statistics are included.)






7. AS-1 Results:  (Displays results of earthquake monitoring using the AS-1 seismograph.  Discussions and illustrations include cataloging, using the S minus P times to determine epicentral distance, and results of measuring magnitudes from AS-1 seismograms.)






8.  PowerPoint Presentations: (PowerPoint files containing information on AS-1 seismograph resources, information and activities.)





Photograph of the AS-1 seismometer.

9.  Links to other AS-1 information: (Links to related AS-1 seismograph information for installation, calibration, operation and ideas for classroom use.  These are early (originally developed in 2001-2) documents on installation and operation of the AS-1 seismograph, but they have been recently updated to add more up-to-date information and fix links, etc.)





10.  Interpreting Seismograms – A Tutorial for the AS-1 Seismograph: (This tutorial is intended as a resource for the interpretation of seismograms recorded by educational seismographs.  The tutorial provides a description of the main features of the Earth that affect seismic wave propagation and therefore controls the character of seismic signals recorded on seismographs.  A catalog of selected seismograms is also presented to illustrate the variation in signal properties with distance, magnitude, and depth of focus.)




11. Fun With Filtering: The November 14, 2007 M7.7 Northern Chile Earthquake – Fun with Filtering (This tutorial illustrates the use of filtering of seismograms to learn more about earthquakes and wave propagation in the Earth and better understand the characteristics of signals contained in seismograms.  Sometimes, filtering a seismogram is similar to searching for clues, like being a detective, to try to determine what happened to produce the signals observed on the seismogram!  Also, nine activities involving filtering are provided for practice and learning.)  



12.  S Wave:  Identifying the S arrival on AS-1 seismograms and estimating distance using the S minus P method

 (Discussion, suggestions and examples of identification of the S wave on AS-1 seismograms.  Links to 20 WLIN sac-file seismograms are provided for exploration and practice.)




13.  WLIN Seismograph Data – AS-1 seismograph data for the West Lafayette, Indiana station can be downloaded (see link to instructions) and used on your computer (whether or not you have an AS-1 seismograph).  In the one year files, the days with no significant events (see earthquake list – EqList.xls) have been deleted to reduce file size for efficient download and storage.  The data can be viewed and analyzed using the AmaSeis software (obtain from Alan Jones website).  A tutorial for the AmaSeis software is also available (see UsingAmaSeis).  A tutorial for interpreting seismograms is also available.


Earthquake List:

Alan Jones Website:

Using AmaSeis:

Interpreting Seismograms:

WLIN Data for 2003 (September only):

WLIN Data for 2004:

WLIN Data for 2005:

WLIN Data for 2006:

WLIN Data for 2007:

WLIN Data for 2008:

WLIN Data for 2009:

WLIN Data for 2010: (through Sept. 13, 2010)


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[1]                     Last modified Sept. 14, 2010

The web page for this document is:  

Funding for this development provided by IRIS and the National Science Foundation.

γ Copyright 2004-10.  L. Braile.  Permission granted for reproduction for non-commercial uses.