The Ocean's Impact on Slow Slip Events

The Ocean's Impact on Slow Slip Events
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海洋对慢滑移事件的影响

DOI:
10.1029/2020gl087273
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发表时间:
2020
影响因子:
5.2
通讯作者:
Chiswell S. M.
Chiswell S. M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Gomberg J.;Baxter P.;Smith E.;Ariyoshi K.;Chiswell S. M.

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我们使用模拟海底压力和Hikurangi俯冲带中SSE的新目录来测试海洋海底压力施加应力的假设,该应力改变了浅海底和近海岸断层上瞬态慢滑事件(SSE)的开始或终止。我们表明,海底压力可以用研究区域~100 km范围内的平均时间历史来表示。我们占SSE的不确定性和统计上影响SSE的过程的多样性,通过估计拒绝零假设的概率,即SSE启动或终止压力是那些预期的已知(建模)海底压力的随机采样,低概率表明一些因果关系。没有海洋压力的变化对SSE启动的影响是可检测的,但建议与它们的终止相关。SSE滑动削弱了断层,使其对微小的应力变化更敏感,这可能解释了结果。
We test the hypothesis that ocean seafloor pressures impart stresses that alter the initiation or termination of transient slow slip events (SSEs) on shallow submarine and near‐coastal faults, using simulated seafloor pressures and a new catalog of SSEs in the Hikurangi subduction zone. We show that seafloor pressures may be represented by an average time history over the ~100‐km dimensions of the study area. We account for SSE uncertainties and the multiplicity of processes that affect SSEs statistically by estimating the probabilities of rejecting the null hypothesis that SSE initiation or termination pressures are those to be expected by chance sampling of known (modeled) seafloor pressures, with low probabilities indicating some causal connection. No impact of ocean pressure changes on SSE initiation is detectable, but a correlation with their terminations is suggested. SSE slip that weakens the fault and makes it more sensitive to small stress changes may explain results.
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发表时间: 2017-10-01
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