| Abstract: | The 10 June 1987 southeastern Illinois earthquake (mbLg=5.2) was located about 200 km east of St Louis, Missouri, caused minor damage in the epicentral area, had a contiguous felt area of about 433 000 km2, and had a total felt area over 1 million km2. Within 47 hours after the main shock, a 15-station aftershock monitoring network (later expanded to 21 instruments) was installed that recorded more than 100 aftershocks in the folllowing 4-day period. Results from the 56 aftershocks that were well located indicate a compact, cylindrically shaped aftershock volume about 1.7 km long, 0.8 km wide, and with a vertical distribution between about 9 and 12 km in depth. Composite focal mechanism solutions of the aftershocks suggest that the predominant mode of faulting is reverse slip, but some strike-slip type motion occurred similar to the mechanism for the main shock as determined from teleseismic data. The maximum principal compressive stress (P axes) is oriented E-ESE and is subhorizontal in plunge. -from Authors |
| Genre: | Article |
| ProdID: | 70016626 |
| Citation Author: | Langer, C. J.; Bollinger, G. A. |
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| Citation End Page: | 445 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin - Seismological Society of America |
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| Citation Number Of Pages: | 23 |
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| Citation Search Results Text: | The southeastern Illinois earthquake of 10 June 1987: the later aftershocks; 1991; Article; Journal; Bulletin - Seismological Society of America; Langer, C. J.; Bollinger, G. A. |
| Citation Start Page: | 423 |
| Citation Volume: | 81 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | The southeastern Illinois earthquake of 10 June 1987: the later aftershocks; 1991; Article; Journal; Bulletin - Seismological Society of America; Langer, C. J.; Bollinger, G. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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