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Abstract
We use radar interferograms and GPS observations to constrain models of magma accumulation and faulting at Sierra Negra volcano, Galápagos, 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.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Deformation and stress-change modeling at Sierra Negra volcano, Galapagos, from ENVISAT INSAR and GPS observations |
| Issue | 649 SP |
| Year Published | 2008 |
| Language | English |
| Contributing office(s) | Volcano Hazards Program |
| Larger Work Title | European Space Agency, (Special Publication) ESA SP |
| Conference Title | Fringe 2007 Workshop |
| Conference Location | Frascati |
| Conference Date | 26 November 2007 through 30 November 2007 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |