Abstract Aquifers and fault zones may interact through groundwater flow and stress redistribution, yet their spatiotemporal relationship remains enigmatic. Here we quantify changes in water storage and associated stress along the Wasatch Fault Zone in Salt Lake Valley, recently shaken by a M5.7 earthquake on March 18th, 2020. Ground deformation mapped by Sentinel-1 SAR imagery (2014-2019) reveals an elongated area with ∼50-mm seasonal uplift corresponding to 0.03-0.06-km3 water storage cycles. Phase shifts across active faults in both water level and deformation suggest control by the low-permeability structures. The seasonal stress changes on the adjoining faults from poroelastic volume strain are two orders of magnitude larger than those from hydrological surface loading, but both are small compared to the annual increase of tectonic loading at seismogenic depths. Historic seismic events, limited in number, do not exhibit statistically significant annual periodicity and hydrological modulation of microseismicity or triggering of the recent M5.7 event is not evident.

中文翻译：

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美国犹他州盐湖谷的含水层变形和活动断层作用

摘要 含水层和断层带可能通过地下水流和应力重新分布相互作用，但它们的时空关系仍然是个谜。在这里，我们量化了盐湖谷瓦萨奇断层带的储水变化和相关应力，该断层最近在 2020 年 3 月 18 日受到 M5.7 地震的影响。 Sentinel-1 SAR 图像（2014-2019）映射的地面变形揭示了延长的区域，季节性隆起约 50 毫米，对应于 0.03-0.06 平方公里的储水循环。水位和变形中活动断层的相移表明受低渗透结构的控制。多孔弹性体积应变引起的相邻断层上的季节性应力变化比水文表面载荷引起的季节性应力变化大两个数量级，但与地震发生深度的构造载荷的年增长相比，两者都较小。历史地震事件数量有限，不表现出统计上显着的年度周期性，微地震的水文调制或最近 M5.7 事件的触发不明显。