Triggering of volcano seismic activity and eruptions by tides, atmosphere pressure, rainfall, and earthquakes have been in constant debate. However, there is limited evidence concerning the triggering of very‐long‐period signals (VLPs), which are closely linked to volcano conduit dynamics. Persistent and repetitive VLP event beneath the Aso volcano, historically termed long‐period tremor (LPT), manifests episodic pressurization and depressurization events in a crack‐like shallow conduit. Here we show that LPT activity display no appreciable spectral peaks associated with major diurnal/semidiurnal tidal constituents or barometric pressure. Instead, passing surface waves of ∼0.01 m/s from the 2011 Tohoku earthquake elevated LPT activity and preferentially increased the likelihood of depressurization events. We suggest that the hydrothermal reservoir near the LPT source behaves like a confined (unconfined) aquifer against short‐period (long‐period) stress. A high stress rate of ∼10² Pa/s is sufficient to enhance the permeability of the conduit plug/wall and preferentially promotes depressurization events.

中文翻译：

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阿苏火山重复的超长周期地震信号对周期性载荷的响应

引发火山地震活动和潮汐，大气压力，降雨和地震爆发的争论一直在争论不休。但是，关于触发很长周期信号（VLP）的证据有限，这与火山管道动力学密切相关。阿苏火山下方的持续性和重复性VLP事件，历史上称为长周期震颤（LPT），在类似裂缝的浅管道中表现出间歇性的增压和减压事件。在这里，我们显示LPT活动没有显示与主要的昼间/半昼间潮气成分或大气压力相关的明显光谱峰。取而代之的是，自2011年东北地震以来，约0.01 m / s的地表波通过提高了LPT的活动性，并优先增加了降压事件的可能性。我们建议，LPT源附近的热液储层的行为类似于承压（无侧限）含水层，以抵抗短期（长期）应力。约10的高应力率²  Pa / s足以增强导管塞/壁的渗透性，并优先促进降压事件。