| Abstract: | The depth to the brittle-ductile transition in the crust is often defined by the intersection of a shear resistance relation in the brittle upper crust that increases linearly with depth and a power law relation for ductile flow in the lower crust that depends strongly on T. Transient variation of this depth caused by a magmatic intrusion at a depth near the regional transition can be modelled by a heat conduction model for a rectangular parallelepiped superimposed on a linear geothermal gradient. When parameters appropriate for the southeastern US are used, a moderate-sized intrusion is found to decrease the transition depth by as much as 7 km; significant variations last approx 10 m.y. Since the base of the seismogenic zone is identified with the brittle-ductile transition, these results imply that intrusions of late Tertiary age or younger could be important sources of clustered seismicity. -A.W.H. |
| Genre: | Article |
| ProdID: | 70014764 |
| Citation Author: | Gettings, M. E. |
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| Citation End Page: | 216 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Variation of depth to the brittle-ductile transition due to cooling of a midcrustal intrusion.; 1988; Article; Journal; Geophysical Research Letters; Gettings, M. E. |
| Citation Start Page: | 213 |
| Citation Volume: | 15 |
| Citation Year: | 1988 |
| Type: | citation/reference |
| Text: | Variation of depth to the brittle-ductile transition due to cooling of a midcrustal intrusion.; 1988; Article; Journal; Geophysical Research Letters; Gettings, M. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1988 00:00 -0600 |
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