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火山体内产生地震活动的物理过程非常复杂,目前仍然没有被完全理解。我们在实验室内用来自埃特纳火山(意大利)的玄武岩做了变形和破碎实验并报道了实验结果。该实验用一组围绕样品的传感器监测,以完成全波形记录及微震事件定位和分析。充满液体的孔隙和损伤区快速破裂后减压激发了许多低频事件,类似于长周期火山地震活动。低频事件与孔隙流体的减压有关,位于破裂样本的损伤区;这些事件都具有一个弱剪切滑动分量(双力偶),与发生在活火山下的流体驱动事件相一致。
The physical processes that generate seismicity in volcanoes are complex and are still not fully understood. We performed experiments on deformation and fragmentation of basalt in the laboratory from Mount Etna (Italy) and reported experimental results. The experiment uses a group of sensors surrounding the sample to monitor and record full waveform and microseismic event location and analysis. Fluid-filled pores and the rapid rupture of the damaged zone depressurize many low-frequency events, similar to long-period volcanic activity. Low-frequency events are associated with the decompression of pore fluids and are located in the damaged zone of the ruptured sample; all have a weak shear slip component (dual couple) consistent with fluid-driven events occurring under active volcanoes.