标题： 活动主逆冲断层与流体通道：地震噪声揭示了卡斯卡迪亚潜没带的隐藏动力学 显示英文标题

标题： Active Protothrusts and Fluid Highways: Seismic Noise Reveals Hidden Subduction Dynamics in Cascadia

摘要： 构造累积、断层滑动和流体运移之间的复杂相互作用影响了浅层俯冲带的动力学。 利用卡斯卡迪亚海底观测站长达十年的连续背景地震数据，我们识别出俯冲动力学存在明显的区域性变化。 北部卡斯卡迪亚表现出完全锁定的巨型断层，伴有持续的应变累积，而中部卡斯卡迪亚则显示出原型断层上的慢滑事件以及上盘断层系统中的快速流体运移。 通过卸载区和阿尔文峡谷断层的有效流体传输可能调节地震行为，但不会导致巨型断层上的慢滑事件，并且可能稳定大地震，促进破裂终止。 显示英文摘要

摘要： Complex interactions between strain accumulation, fault slip, and fluid migration influence shallow subduction zone dynamics. Using a decade of continuous ambient seismic data from Cascadia seafloor observatories, we identified distinct regional variations in subduction dynamics. Northern Cascadia exhibits a fully locked megathrust with persistent strain accumulation, while central Cascadia displays a slow slip event on protothrusts and rapid fluid migration along fault systems in the overriding plate. Effective fluid transport through the decollement and the Alvin Canyon Fault likely modulates the earthquake behavior but does not cause slow slip events on the megathrust and likely stabilizes large earthquakes, promoting rupture arrest.