Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress

Injection‐Induced Seismicity Size Distribution Dependent on Shear Stress
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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.
H?ring M. O.
中科院分区:
地球科学1区
文献类型:
--
作者:
Mukuhira Y.;Fehler M. C.;Ito T.;Asanuma H.;H?ring M. O.

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与天然地震活动一样,注入引起的诱发地震活动也表现出幂律大小分布,其梯度b值用于地震危险性分析。尽管众所周知的结果是b值与天然地震的差应力呈负相关,但由于差应力对于注入诱发地震活动几乎是恒定的,因此b值变化没有类似的相关性,因此我们使用断层方向和原地应力信息研究了b值对作用于现有裂缝的相对剪应力的依赖性。沿沿着现有高剪切应力断裂发生的地震活动的b-值明显低于与低剪切应力断裂相关的b-值。我们研究了b值对微小变化的差应力的依赖性,但这种关系并不清楚。注采诱发地震b值与断层上的相对剪应力有关,这是对注采诱发地震b值变化的一种新的物理解释。
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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