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
Möllhoff M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bell AF;Hernandez S;McCloskey J;Ruiz M;LaFemina PC;Bean CJ;Möllhoff M

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动态触发的地震跟踪加拉帕戈斯群岛塞拉内格拉火山喷发前的动乱演变。动态地震的触发倾向被认为取决于局部应力状态和应力扰动的幅度。然而,这种依赖的性质还没有在单一的地壳体积内得到确认。在这里,我们展示了在加拉帕戈斯群岛的内格拉火山,随着岩浆储集层的膨胀提高了应力状态,动态触发的地震的强度增加了。远震面波中短期地震活动的扰动也随动应变峰值增大而增大。随着胁迫下沉和应力和背景地震活动率的降低,等效的动态应变不再触发可检测到的地震活动。这些发现提供了对动态触发的主要控制的直接约束,并表明对动态压力的反应可能有助于限制火山动乱的演变。
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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