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Magnitude 5.2 - ILLINOIS

2008 April 18 09:37:00 UTC

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Earthquake Details

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Magnitude5.2
Date-Time
Location38.450°N, 87.890°W
Depth11.6 km (7.2 miles) set by location program
RegionILLINOIS
Distances
  • 7 km (5 miles) NNE (13°) from Bellmont, IL
  • 9 km (6 miles) E (88°) from Bone Gap, IL
  • 11 km (7 miles) N (350°) from Keensburg, IL
  • 60 km (38 miles) NNW (331°) from Evansville, IN
  • 206 km (128 miles) E (95°) from St. Louis, MO
Location UncertaintyError estimate not available
ParametersNST=111, Nph=111, Dmin=36.4 km, Rmss=0 sec, Gp= 61°,
M-type=moment magnitude (Mw), Version=A
Source
  • Center for Earthquake Research and Information, Memphis, Tennessee, USA
Event IDus2008qza6
  • This event has been reviewed by a seismologist.
  • Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.

Earthquake Summary

Small globe showing earthquakeSmall map showing earthquake

Earthquake Summary Poster

  • The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 35 km (20 miles) SW of Vincennes, Indiana and 205 km (125 miles) SW of INDIANAPOLIS, Indiana at 3:36 AM MDT, Apr 18, 2008 (4:36 AM CDT in Illinois). The magnitude and location may be revised when additional data and further analysis results are available.

  • Felt Reports

    Reports of minor structural damage in West Salem, Illinois and Louisville, Kentucky. Felt over a wide area of the central United States with felt reports as far west as Kansas, as far north as the Upper Peninsula of Michigan and as far south as Georgia.

    Tectonic Summary

    EARTHQUAKES IN THE WABASH VALLEY SEISMIC ZONE
    These earthquakes occurred in the Wabash Valley Seismic zone. The earthquakes in this zone are scattered over a large area of southeastern Illinois and southwest Indiana. The zone had at least eight prehistoric earthquakes over the past 20,000 years with estimated magnitudes ranging from about 6.5 to 7.5, based on geologic evidence. Earthquakes of the size of the recent quake (Mw 5.2) can produce smaller aftershocks over the following days. A few might be large enough to be felt. Typically, earthquakes of this size (Mw 5.2) can cause light damage within a few tens of miles from the epicenter. Central and eastern US earthquakes generally shake areas about 10 times as large as those that occur in California. It is not surprising that this earthquake was felt as far south as Florida.

    The Wabash Valley Seismic zone is adjacent to the more seismically active New Madrid seismic zone on the seismic zone's north and west. The recent earthquake is also within the Illinois basin - Ozark dome region that covers parts of Indiana, Kentucky, Illinois, Missouri, and Arkansas and stretches from Indianapolis and St. Louis to Memphis. Moderately frequent earthquakes occur at irregular intervals throughout the region. The largest historical earthquake in the Illinois Basin region (magnitude 5.4) damaged southern Illinois in 1968. Moderately damaging earthquakes strike somewhere in the region each decade or two, and smaller earthquakes are felt about once or twice a year.

    Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).

    FAULTS
    Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most bedrock in the Illinois basin - Ozark dome region was formed as several generations of mountains rose and were eroded down again over the last billion or so years.

    At well-studied plate boundaries like the San Andreas fault system in California, scientists can often determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. The Illinois basin - Ozark dome region is far from the nearest plate boundaries, which are in the center of the Atlantic Ocean, in the Caribbean Sea, and in the Gulf of California. The region is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even the known faults are poorly located at earthquake depths. Accordingly, few earthquakes in the region can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in the Illinois basin - Ozark dome region is the earthquakes themselves.

    Earthquake Information for Illinois

    Interview with Seismologist, Harley Benz, USGS Golden, CO