Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress
Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress
复制标题
取决于剪切应力的注入诱发地震活动大小分布
DOI:
10.1029/2020gl090934
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发表时间:
2021
影响因子:
5.2
通讯作者:
H?ring M. O.
中科院分区:
文献类型:
--
作者:
Mukuhira Y.;Fehler M. C.;Ito T.;Asanuma H.;H?ring M. O.
Like natural seismicity, induced seismicity caused by injection also shows a power law size distribution, and its gradientb‐value is used for seismic hazard analysis. Despite the well‐known result thatb‐value is negatively correlated with differential stress for natural earthquakes, there is no similar correlation forb‐value variations because the differential stress is nearly constant for injection‐induced seismicity, we thus investigate theb‐value dependence on the relative shear stress acting on existing fractures, using the fault orientation and in situ stress information. The seismicity occurring along existing fractures having high shear stress has significantly lowerb‐values than does that associated with lower shear stress fractures. We examine theb‐value dependency on slightly changing differential stress, but the relationship is not clear. Theb‐value for injection‐induced seismicity is dependent on relative shear stress on faults, which is a novel physical explanation for theb‐value variations of induced seismicity.
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DOI:
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发表时间:
2015
期刊:
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Journal of Geophysical Research: Solid Earth
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