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《Progress in Geophysics》 2012-06
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The role of pore pressure in earthquake triggering and process of swarm earthquakes and aftershocks

CHEN Tao,LIU Yao-wei,YANG Duo-xing,ZHANG Lei,FANG Zhen,XU Li-qing (Key Laboratory of Crustal Dynamics,Institute of Crustal Dynamics,CEA,Beijing 100085,China)  
Pore pressure of fluid in earth's crust is one of the key roles in earthquake triggering and process of swarm earthquakes and aftershocks.This paper reviews different mechanics of earthquake triggering when pore pressure elevate and decline,discuss the linear pore pressure diffusion and non-linear pore pressure diffusion which related to the dynamic process of swarm earthquakes and aftershocks.By applying pore pressure diffusion mechanism we analyzed typical spatiotemporal characteristics of swarm earthquakes and aftershocks sequences.We summarized the dynamic process and hydraulic diffusivities of swarm earthquakes,fluid-injection induced seismicity,reservoir induced seismicity,volcano seismicity and aftershocks.We discuss the role of pore pressure in Wenchuan MS 8.0 earthquake and aftershocks,and physical meaning of hydraulic diffusivity.Finally existing problems and works need doing in the future have been presented.Comprehensive analysis in this field will help us to deepen analysis of dynamic mechanism of earthquake triggering and process of swarm earthquakes and aftershocks,it is meaningful to understand the role of fluid in earthquake preparation.
【Fund】: 强震短临跟踪监测设备的实用化研发项目(ZDJ2011-02);; “十一五”国家科技支撑项目“汶川地震断裂带科学钻探——断裂带深部流体行为及其在地震过程中的作用(WFSD-10)”共同资助
【CateGory Index】: P315
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