A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galapagos
A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galapagos
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DOI：
10.1130/g22826a.1
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发表时间：
2006-12-01
期刊：
影响因子：
5.8
通讯作者：
Meertens, Charles M.
中科院分区：
文献类型：
--
作者：
Chadwick, William W., Jr.;Geist, Dennis J.;Meertens, Charles M.
自2002年以来对加拉帕戈斯群岛内格拉山脉火山进行的大地测量监测结果表明，一个类似于2公里深的岩床的填充和加压最终导致了2005年10月22日开始的喷发。持续的全球定位系统（CGPS）监测测量到超过2米的加速膨胀导致喷发，并促成了自1992年以来近5米的总抬升，这是玄武岩破火山口有史以来最大的间接膨胀。这种异常的隆起部分是由重复的活板门断层作用所调节的，同震CGPS数据为改进的变形模型提供了强有力的约束。这些结果突出了膨胀，断层和喷发之间的反馈在玄武质火山，并表明，故障以上的侵入岩浆体可以减轻累积的应变，有效地推迟喷发。
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.