南卡斯卡迪亚板块边缘附近 ETS 行为的沿走向变化

C. Nuyen, David Schmidt
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摘要

卡斯卡迪亚俯冲带全线的偶发性震颤和滑动(ETS)都有详细记录。我们探讨了 ETS 发生情况在俯冲带最南端边缘的变化情况,那里的几何复杂性和板块窗口可能会改变板块界面的条件。这项研究利用震颤和全球导航卫星系统时间序列数据,确定了 2016.5-2022 年间卡斯卡迪亚南部发生的 19 次最大 ETS 事件,并记录了接近板块边缘事件的源属性。这些事件的分布式滑移模型显示,沿大地壳的累积断层滑移在北纬 40.5 度附近达到最大值,大型 ETS 事件在该位置可容纳高达 85% 的板块汇聚。然而,ETS断层滑动和震颤在北纬40°附近终止,距离俯冲板块南侧边缘约50公里。在考虑了一系列解释之后,我们提出,俯冲板块复杂的几何形状和逐渐升温改变了 ETS 行为,不允许地震滑动发生在卡斯卡迪亚最南端深度低于 35 千米的板块界面上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Along-strike changes in ETS behavior near the slab edge of Southern Cascadia
Episodic tremor and slip (ETS) is well-documented along the entire length of the Cascadia subduction zone. We explore how the occurrence of ETS varies at the southernmost edge of the subduction zone, where geometric complexity and a slab window likely alter conditions along the plate interface. This work uses tremor and GNSS time series data to identify nineteen of the largest ETS events in southern Cascadia between 2016.5-2022 and document source properties for events approaching the slab edge. Distributed slip models for these events show that cumulative fault slip along the megathrust reaches a maximum near 40.5° N latitude and that large ETS events accommodate up to 85% of plate convergence at this location. However, ETS fault slip and tremor terminate near 40° N latitude, some 50 km before the southern lateral edge of the subducting plate. After considering a range of explanations, we propose that the complex geometry and progressive heating of the subducting plate modifies ETS behavior and does not allow seismic slip to occur along the plate interface in southernmost Cascadia below 35 km depth.
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