Magnitude 4.6 ILLINOIS
Friday, April 18, 2008 at 15:14:16 UTC
Record Section
The record section below shows seismograms recorded on seismographic stations spanning the contiguous United States. The seismograms are plotted as a function of distance with stations close to the earthquake at the top and more distant stations plotted at the bottom. Zero time corresponds to the origin time of the earthquake. The station name is plotted to the right. For large earthquakes, you can see several seismic arrivals that travel different paths through the earth. Each trace is normalized to its maximum amplitude.
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
