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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volcanic strain change prior to an earthquake swarm observed by groundwater level sensors in Meakan-dake, Hokkaido, Japan
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Volcanic strain change prior to an earthquake swarm observed by groundwater level sensors in Meakan-dake, Hokkaido, Japan

机译：日本北海道Meakan-dake地下水位传感器观测到的地震群之前的火山应变变化

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摘要

We installed and operated a low-cost groundwater level observation system at intermittent hot spring wells in order to monitor volcanic strain signals from the active Meakan-dake volcano in eastern Hokkaido, Japan. Data are sampled at 1 Hz and are transmitted to the data center in real time. Evaluation of the water level time series with theoretical predictive tidal strain and coseismic static strain changes has suggested that the wells penetrate to the artesian aquifer and act as a volumetric strain sensor. An active earthquake swarm with more than 400 events occurred at the shallower part of the volcano from January 9 to 11, 2008. Three independent wells recorded pre- to co-swarm groundwater drops simultaneously, which represented a decrease in volumetric strain. The total volumetric strain change during the three active days was estimated to be from 6 to 7 × 10~(-7). The observed data, including changes in volumetric strain, absence of deformation in the GPS coordinates, and activation of deep low-frequency earthquakes, might imply possible deflation of a source deeper than 10 km, and these preceding deeper activities might induce an earthquake swarm in a shallower part of the Meakan-dake volcano.
机译：为了监视来自日本北海道东部现役Meakan-dake火山的火山应变信号，我们在间歇性温泉井中安装并运行了低成本的地下水位观测系统。数据以1 Hz采样，并实时传输到数据中心。用理论预测的潮汐应变和同震静态应变变化对水位时间序列进行评估表明，这些井可渗透到自流含水层中，并充当体积应变传感器。从2008年1月9日至11日，火山的较浅部分发生了活跃的地震群，发生了400多个事件。在记录前到共群地下水下降的同时，记录了三个独立的井，这表示体积应变减小。在三个工作日内，总的体积应变变化估计为6到7×10〜（-7）。所观测到的数据，包括体积应变的变化，GPS坐标中不存在变形以及深低频地震的激活，可能暗示着深度超过10 km的震源可能发生放气，而这些较深的活动可能会诱发一个地震群。 Meakan-dake火山的较浅部分。

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