| Abstract: | The Hengill-Grensdalur area in Iceland generates frequent small non-double-couple earthquakes with explosive volumetric components. We collected high quality three-component digital recordings of 4,000 earthquakes on a purpose-designed, 32-station network in 1991, and determined focal mechanisms for 100 of the best-recorded earthquakes by inverting amplitude ratios. Many of the mechanisms are consistent, within the errors, with simultaneous shear and tensile faulting, with tensile faults parallel to the local spreading ridge, and shear faulting similar to that in the South Iceland transform-fault zone. Some events cannot be explained by this model, however, and require other processes, such as crack closing and partial compensation of tensile cracks by fluid flow. |
| Genre: | Article |
| ProdID: | 70019438 |
| Citation Author: | Julian, B. R.; Miller, A. D.; Foulger, G. R. |
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| Citation End Page: | 746 |
| Citation Issue: | 7 |
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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: | Non-double-couple earthquake mechanisms at the Hengill-Grensdalur volcanic complex, southwest Iceland; 1997; Article; Journal; Geophysical Research Letters; Julian, B. R.; Miller, A. D.; Foulger, G. R. |
| Citation Start Page: | 743 |
| Citation Volume: | 24 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Non-double-couple earthquake mechanisms at the Hengill-Grensdalur volcanic complex, southwest Iceland; 1997; Article; Journal; Geophysical Research Letters; Julian, B. R.; Miller, A. D.; Foulger, G. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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