期刊
GEOLOGY
卷 34, 期 12, 页码 1025-1028出版社
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G22826A.1
关键词
inflation; intrusion; geodesy; global positioning system; inferometric synthetic aperture radar
类别
The results of geodetic monitoring since 2002 at Sierra Negra volcano in the Galapagos Islands show that the filling and pressurization of an similar to 2-km-deep sill eventually led to an eruption that began on 22: October 2005. Continuous global positioning system (CGPS) monitoring measured > 2 m of accelerating inflation leading up to the eruption and contributed to nearly 5 m of total uplift since 1992, the largest precursory inflation ever recorded at a basaltic caldera. This extraordinary uplift was accommodated in part by repeated trapdoor faulting, and coseismic CGPS data provide strong constraints for improved deformation models. These results highlight the feedbacks between inflation, faulting, and eruption at a basaltic volcano, and demonstrate that faulting above an intruding magma body can relieve accumulated strain and effectively postpone eruption.
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