| Abstract: | We use radar interferograms and GPS observations to constrain models of magma accumulation and faulting at Sierra Negra volcano, Gala??pagos, during the years before its 2005 eruption. The data have shown ???5 m of pre-eruption uplift and multiple trapdoor faulting events on an intra-caldera fault system. We find the pattern of uplift to be consistent with an inflating sill at 2.2 km depth under the caldera. Our deformation modeling and stress-change calculations suggest that the inflating sill triggered faulting on an inward-dipping thrust fault and that the faulting in turn relieved the pressure within the sill. This sill-fault interaction tends to thicken the sill and limit its lateral extent within the area bounded by the fault.. |
| Genre: | Conference Paper |
| ProdID: | 70009725 |
| Citation Author: | Jonsson, S.; Chadwick, W. W.; Poland, M.; Geist, D. |
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| Citation Issue: | 649 SP |
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| Citation Language: | English |
| Citation Larger Work Title: | European Space Agency, (Special Publication) ESA SP |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Deformation and stress-change modeling at Sierra Negra volcano, Gala??pagos, from ENVISAT INSAR and GPS observations; 2008; Conference Paper; European Space Agency, (Special Publication) ESA SP; Jonsson, S.; Chadwick, W. W.; Poland, M.; Geist, D. |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Deformation and stress-change modeling at Sierra Negra volcano, Gala??pagos, from ENVISAT INSAR and GPS observations; 2008; Conference Paper; European Space Agency, (Special Publication) ESA SP; Jonsson, S.; Chadwick, W. W.; Poland, M.; Geist, D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
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