Below are the seismograms of the 2 Illinois earthquakes recorded by Weston Observatory's BC-ESP EQ1 seismograph on April 18th, 2008.
For a Tectonic summary of Illinois click here [1].
Below are the seismograms of the 2 Illinois earthquakes recorded by Weston Observatory's BC-ESP EQ1 seismograph on April 18th, 2008.
For a Tectonic summary of Illinois click here [1].
Links:
[1] http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2008qza6.php#summary