Ground-motion parameters of the southwestern Indiana earthquake of 18 June 2002 and the disparity between the observed and predicted values
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Abstract
The M 4.5 southwestern Indiana earthquake of 18 June 2002 triggered 46 blast monitors in Indiana, Illinois, and Kentucky. The resulting flee-field particle velocity records, along with similar data from previous earthquakes in the study area, provide a clear standard for judging the reliability of current maps for predicting ground motions greater than 2 Hz in southwestern Indiana and southeastern Illinois. Peak horizontal accelerations and velocities, and 5% damped pseudo-accelerations for the earthquake, generally exceeded ground motions predicted for the top of the bedrock by factors of 2 or more, even after soil amplifications were taken into consideration. It is suggested, but not proven, that the low shear-wave velocity and weathered bedrock in the area are also amplifying the higher-frequency ground motions that have been repeatedly recorded by the blast monitors in the study area. It is also shown that there is a good correlation between the peak ground motions and 5% pseudo-accelerations recorded for the event, and the Modified Mercalli intensities interpreted for the event by the U.S. Geological Survey.
Suggested Citation
Street, R., Wiegand, J., Woolery, E., Hart, P., 2005, Ground-motion parameters of the southwestern Indiana earthquake of 18 June 2002 and the disparity between the observed and predicted values: Seismological Research Letters, v. 76, no. 4, p. 512-530, https://doi.org/10.1785/gssrl.76.4.512.
ISSN: 1938-2057 (online)
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Ground-motion parameters of the southwestern Indiana earthquake of 18 June 2002 and the disparity between the observed and predicted values |
| Series title | Seismological Research Letters |
| DOI | 10.1785/gssrl.76.4.512 |
| Volume | 76 |
| Issue | 4 |
| Year Published | 2005 |
| Language | English |
| Publisher | Seismological Society of America |
| Description | 19 p. |
| First page | 512 |
| Last page | 530 |
| Country | United States |
| State | Illinois, Indiana, Kentucky |