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Earth science and Earth science teaching


Title: Earth science and Earth science teaching Getting the message out Last modified by: Lawrence W Braile Created Date: 5/17/2003 12:40:59 PM – PowerPoint PPT presentation

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Title: Earth science and Earth science teaching

The AS-1 Seismometer and AmaSeis Software An
Effective Educational Seismograph
Larry Braile Department of Earth and Atmospheric
Sciences Purdue University IRIS Seismographs in
Schools Program http//
08.ppt Updat
ed October 2011
Exploring Planet Earth
The AS-1 Seismometer
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

(developed by Alan Jones, SUNY Binghamton, NY)
IRIS AmaSeis Software
24-Hour Screen Display
Extracted Seismogram
Monitoring Earthquakes
  • 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.
  • .

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.
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.
Drawing an arc on the globe for Oaxaca EQ for TUC
Comparison of calculated earthquake to station
distance and distance estimated from S P times
N 169 Standard Deviation 1.89 degrees
Calculating Magnitude
Online Earthquake Magnitude Calculator for the
AS-1 Seismograph
Inputs Distance (degrees), Amplitude (digital
units from AmaSeis screen converted to
displacement by the calculator), and wave period
Comparison of AS-1 and USGS Magnitudes
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 Mw Magnitudes
AS-1 mb, MS and mbLg magnitudes correlate well
with M (Mw, moment magnitude) except for the
largest earthquakes
AS-1 Seismograph Resources
AS-1 Seismograph Information (Links) http//web.i
Teaching Modules and Tutorials http//web.ics.pur
View Near Real Time Seismograph
Displays http//
WLIN Seismograph Earthquake List http//web.ics.p
WLIN Earthquake data for download (as large as
50MB) http//
zip also,,,,,,
Instructions for downloading 2003 (etc.) data to
the AmaSeis folder on your computer http//web.ic
Exploring Planet Earth