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.

中文翻译：

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加拉帕戈斯群岛塞拉内格拉火山的动态地震触发反应轨迹演变

动态地震触发的倾向被认为取决于局部应力状态和应力扰动的幅度。然而，这种依赖性的性质尚未在单个地壳体积内得到证实。在这里，我们展示了在加拉帕戈斯群岛的 Sierra Negra 火山，随着岩浆库的膨胀提高了应力状态，动态触发地震的强度增加。远震表面波中短期地震活动的扰动也随着峰值动态应变而增加。随着快速共同沉降以及应力和背景地震活动率的降低，等效动态应变不再触发可检测的地震活动。