| Abstract: | The M 4.5 southwestern Indiana earthquake of 18 June 2002 triggered 46 blast monitors in Indiana, Illinois, and Kentucky. The resulting free-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. |
| Genre: | Article |
| ProdID: | 70029487 |
| Citation Author: | Street, R.; Wiegand, J.; Woolery, E. W.; Hart, P. |
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| Citation End Page: | 530 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Seismological Research Letters |
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| Citation Number Of Pages: | 19 |
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| Citation Search Results Text: | Ground-motion parameters of the southwestern Indiana earthquake of 18 June 2002 and the disparity between the observed and predicted values; 2005; Article; Journal; Seismological Research Letters; Street, R.; Wiegand, J.; Woolery, E. W.; Hart, P. |
| Citation Start Page: | 512 |
| Citation Volume: | 76 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Ground-motion parameters of the southwestern Indiana earthquake of 18 June 2002 and the disparity between the observed and predicted values; 2005; Article; Journal; Seismological Research Letters; Street, R.; Wiegand, J.; Woolery, E. W.; Hart, P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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