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arXiv 2409.03330physics.geo-phphysics.flu-dyn
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注入诱发慢滑移事件的最大尺度与震级

Maximum size and magnitude of injection-induced slow slip events

Alexis Sáez, François Passelègue, Brice Lecampion

AI总结:

基于破裂物理推导了任意注入流量历史下无震破裂最大尺度及无震滑移事件最大震级的标度关系,揭示断层带储水系数、背景应力和注入体积是关键控制因素。

摘要:

流体注入可诱发无震滑移,由此产生的应力变化可能比孔隙压力扩散传播得更快,从而可能在距注入井相当远的地方触发地震活动。因此,约束这些无震破裂的最大范围对于更好地划定注入活动在地震危险性方面的影响区域具有重要意义。本文基于破裂物理推导了一个标度关系,用于描述无震破裂的最大尺度,并考虑了具有任意流量历史的流体注入情况。此外,基于越来越多的证据表明这些作业过程中的矩释放通常以无震成分为主,我们推导了无震滑移事件最大震级的标度关系。我们的理论预测与从实验室到实际案例的广泛事件尺度范围内的观测结果一致,表明断层带储水系数、背景应力状态和注入流体体积是注入诱发慢滑移事件最大尺度和震级的关键决定因素。

英文摘要:

Fluid injections can induce aseismic slip, resulting in stress changes that may propagate faster than pore pressure diffusion, potentially triggering seismicity at significant distances from injection wells. Constraining the maximum extent of these aseismic ruptures is thus important for better delineating the influence zone of injections concerning their seismic hazard. Here we derive a scaling relation based on rupture physics for the maximum size of aseismic ruptures, accounting for fluid injections with arbitrary flow rate histories. Moreover, based on mounting evidence that the moment release during these operations is often predominantly aseismic, we derive a scaling relation for the maximum magnitude of aseismic slip events. Our theoretical predictions are consistent with observations over a broad spectrum of event sizes, from laboratory to real-world cases, indicating that fault-zone storativity, background stress state, and injected fluid volume are key determinants of the maximum size and magnitude of injection-induced slow slip events.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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