Dynamic earthquake triggering response tracks evolving unrest at Sierra Negra volcano, Galápagos Islands.
Dynamic earthquake triggering response tracks evolving unrest at Sierra Negra volcano, Galápagos Islands.
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动态地震触发反应跟踪塞拉内格拉火山演变的动荡,Galápagos群岛。
DOI:
10.1126/sciadv.abh0894
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发表时间:
2021-09-24
期刊:
影响因子:
13.6
通讯作者:
Möllhoff M
中科院分区:
文献类型:
--
作者:
Bell AF;Hernandez S;McCloskey J;Ruiz M;LaFemina PC;Bean CJ;Möllhoff M
Dynamically triggered earthquakes track pre-eruptive unrest evolution at Sierra Negra volcano, Galápagos Islands. The propensity for dynamic earthquake triggering is thought to depend on the local stress state and amplitude of the stress perturbation. However, the nature of this dependency has not been confirmed within a single crustal volume. Here, we show that at Sierra Negra volcano, Galápagos Islands, the intensity of dynamically triggered earthquakes increased as inflation of a magma reservoir elevated the stress state. The perturbation of short-term seismicity within teleseismic surface waves also increased with peak dynamic strain. Following rapid coeruptive subsidence and reduction in stress and background seismicity rates, equivalent dynamic strains no longer triggered detectable seismicity. These findings offer direct constraints on the primary controls on dynamic triggering and suggest that the response to dynamic stresses may help constrain the evolution of volcanic unrest.
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