SGER: Response of Alum Rock springs to the magnitude 5.6 Alum Rock earthquake on October 30, 2007

对地震的水文反应，如蒸汽流量的增加或威尔斯水位的变化，并不罕见。 水文响应是重要的，因为它们提供了独特的洞察水文和构造过程在空间和时间尺度上的耦合，否则很难研究。水文响应地震的起源一直是有争议的主题，在很大程度上是因为有许多模型来解释观测和几乎没有测量适合区分假设。 2007年10月30日，加州的阿卢姆罗克斯普林斯附近发生5.6级地震。 PI在过去5年中对这些泉水进行了监测，以便为地震后流量和水成分的变化提供基准。 在地震后的前5天，他记录了三倍的排放量。 明矾罗克斯普林斯沿着海沃德断层的沿着流出。 它们排出的水是当地大气降水和从深处排出的原生沃茨的混合物。PI将使用地震后3个月内收集的水样的稳定同位素分析，以测试增加排放的来源的拟议模型。 因为每个泉水的泉水在地球化学上是不同的，所以应该有可能记录断层带管道的变化。 还可以确定从泉水中流出的多余水的来源是在深层还是在浅层地下。该项目提供了一个跨学科的机会，了解断层带的结构和演化。 特别是，它将提供新的（可能是唯一的）的作用，流体在断层带过程的限制。 PI将把对泉水的监测与加州大学伯克利分校的课程相结合，包括新生研讨会、本科生地球动力学和研究生课程。 调查结果也将与泉水所在的明矾岩公园的管理人员进行沟通。 该公园是当地居民和K-12学生实地考察的热门目的地。 温泉是公园的主要景点，这项工作可用于更新解释性标志和展示。

Hydrologic responses to earthquakes, such as increases in steam flow or changes in the water level in wells, are not uncommon. Hydrologic responses are important because they provide unique insight into the coupling of hydrologic and tectonic processes at spatial and temporal scales that are otherwise difficult to study.The origin of hydrologic responses to earthquakes has been the subject of controversy, in large part because there are many models to explain observations and almost no measurements suitable for distinguishing between hypotheses. On October 30, 2007 a magnitude 5.6 earthquake occurred near the Alum Rock springs, California. The PI monitoring these springs for the past 5 years in order to provide a benchmark for post-seismic changes in discharge and water composition. Over the first 5 days following the earthquake he documented a three-fold increase in discharge. The Alum Rock springs discharge along one strand of the Hayward fault. They discharge water that is a mixture of local meteoric water and connate waters expelled from depth.The PI will use stable isotope analyses of water samples collected over a 3 month time period following the earthquake in order to test proposed models for the origin of the increased discharge. Because the spring water at each spring is geochemically distinct it should be possible to document changes in fault zone plumbing. It will also be possible to determine whether the source of the excess water flowing from the springs originates at depth, or in the shallow subsurface. This project offers an interdisciplinary opportunity to understand fault zone structure and evolution. In particular it will provide new (and probably unique) constraints on the role of fluids in fault zone processes. The PI will integrate the monitoring of the springs with courses taught at UC Berkeley, including freshman seminars, undergraduate-level geodynamics, and graduate level classes. The results will also be communicated with the managers of Alum Rock Park where the springs are located. The park is a popular destination for local residents and K-12 student field trips. The springs are the main draw of the park and this work can be used to update interpretative signs and displays.