exploring planet earth [email protected] braile updated october 2011 the as-1 seismometer and...
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![Page 1: Exploring Planet Earth braile@purdue.edu braile Updated October 2011 The AS-1 Seismometer and AmaSeis Software – An Effective Educational](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d2b5503460f94a002dc/html5/thumbnails/1.jpg)
Exploring Planet Earth
[email protected]/~braile
Updated October 2011
The AS-1 Seismometer and AmaSeis Software – An Effective Educational Seismograph
Larry BraileDepartment of Earth and
Atmospheric Sciences
Purdue University
IRIS Seismographs in Schools Program
http://www.iris.edu/hq/sis
http://web.ics.purdue.edu/~braile/new/AS1AmaSeis2008.ppt
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The AS-1 Seismometer
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The AS-1 Seismometer• Inexpensive (~$500); easy to set up and use
• Demonstrate how a seismograph works
• “Make your own earthquake”
• Monitor earthquakes – local (~M3+), regional (~M5+), worldwide (~M6.5+)
• Connects to IRIS data archiving and analysis software (written by Alan Jones) on Windows computer; maintain EQ catalog
• Display, filter and analyze seismograms
• Calculate epicenter-to-station distance from S-P times; calculate magnitude
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24-Hour Screen Display
Extracted Seismogram
(developed by Alan Jones, SUNY Binghamton, NY)
IRIS AmaSeisSoftware
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January 22, 2003, M7.8, Colima, Mexico earthquake recorded on an AS-1 seismograph and AmaSeis software at West Lafayette, IN. Distance = 26.01 degrees. Seismogram was filtered from 0.001 – 0.1 Hz.
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Maintaining a catalog of recorded earthquakes is a convenient and educational exercise associated with educational seismograph operation. Data entries require observation and analysis of seismograms, retrieving information from the internet and performing simple calculations.
Monitoring Earthquakes
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Determine distance from S-P time
Using the AmaSeis travel time curve tool to determine the epicenter-to-station distance from the S-P arrival times. January 22, 2003, M7.8, Colima, Mexico earthquake recorded on an AS-1 seismograph and AmaSeis software at West Lafayette, IN; Distance = 26.01 degrees.
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Drawing an arc on the globe for Oaxaca EQ for TUC station.
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Comparison of calculated earthquake to station distance and distance estimated from S – P times
N = 169; Standard Deviation = 1.89 degrees
http://web.ics.purdue.edu/~braile/edumod/MagCalc/AS1Results.htm
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Calculating Magnitude
Inputs: Distance (degrees), Amplitude (digital units from AmaSeis screen; converted to displacement by the calculator), and wave period (seconds).
Online Earthquake Magnitude Calculator for the AS-1 Seismograph
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MS Magnitudes: N = 270; Standard Deviation = 0.25 magnitude units.mb Magnitudes: N = 520; Standard Deviation = 0.26 magnitude units.mbLg Magnitudes: N = 34; Standard Deviation = 0.35 magnitude units.
Comparison of AS-1 and USGS Magnitudes
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Comparison of AS-1 and USGS Mw Magnitudes
AS-1 mb, MS and mbLg magnitudes correlate well with M (Mw, moment magnitude) except for the largest earthquakes
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Exploring Planet Earth
AS-1 Seismograph Resources
AS-1 Seismograph Information (Links):http://web.ics.purdue.edu/~braile/indexlinks/as1.htm
View Near Real Time Seismograph Displays:http://www.iris.edu/amaseis/schools/
Teaching Modules and Tutorials:http://web.ics.purdue.edu/~braile/edumod/as1lessons/as1lessons.htm
WLIN Seismograph Earthquake List:http://web.ics.purdue.edu/~braile/edumod/as1lessons/InterpSeis/EqList.xls
WLIN Earthquake data for download (as large as 50MB):http://web.ics.purdue.edu/~braile/new/2004.zip also, 2005.zip, 2006.zip, 2007.zip, 2008.zip, 2009.zip, 2010.zip
Instructions for downloading 2003 (etc.) data to the AmaSeis folder on your computer:http://web.ics.purdue.edu/~braile/edumod/as1lessons/UsingAmaSeis/download2003.htm