The April 18, 2008 Illinois earthquake: an ANSS monitoring success
Seismological Research Letters
By: Robert B. Herrmann, M. Withers, and H. Benz
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
The largest-magnitude earthquake in the past 20 years struck near Mt. Carmel in southeastern Illinois on Friday morning, 18 April 2008 at 09:36:59 UTC (04:37 CDT). The Mw 5.2 earthquake was felt over an area that spanned Chicago and Atlanta, with about 40,000 reports submitted to the U.S. Geological Survey (USGS) “Did You Feel It?” system. There were at least six felt aftershocks greater than magnitude 3 and 20 aftershocks with magnitudes greater than 2 located by regional and national seismic networks. Portable instrumentation was deployed by researchers of the University of Memphis and Indiana University (the first portable station was installed at about 23:00 UTC on 18 April). The portable seismographs were deployed both to capture near-source, high-frequency ground motions for significant aftershocks and to better understand structure along the active fault. The previous similar-size earthquake within the Wabash Valley seismic zone (WVSZ) of southeastern Illinois and southwestern Indiana was a magnitude 5.0 in June 1987. The seismicity associated with the WVSZ is thought to occur in a complex horst and graben system of Precambrian igneous and metamorphic units at depths between 12 and 20 km. Paleoliquefaction evidence suggests several major shaking events have occurred within the past 12,000 years (Munson et al. 1997).
Suggested Citation
Herrmann, R., Withers, M., Benz, H., 2008, The April 18, 2008 Illinois earthquake: an ANSS monitoring success: Seismological Research Letters, v. 79, no. 6, p. 830-843, https://doi.org/10.1785/gssrl.79.6.830.
ISSN: 1938-2057 (online)
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The April 18, 2008 Illinois earthquake: an ANSS monitoring success |
| Series title | Seismological Research Letters |
| DOI | 10.1785/gssrl.79.6.830 |
| Volume | 79 |
| Issue | 6 |
| Year Published | 2008 |
| Language | English |
| Publisher | Seismological Research Letters |
| Publisher location | El Cerrito, CA |
| Contributing office(s) | National Earthquake Information Center |
| Description | 14 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Seismological Research Letters |
| First page | 830 |
| Last page | 843 |
| Country | United States |
| State | Illinois |