Seismic Indicators of Time-Varying Deep Deformation along the Central San Andreas Fault

沿着圣安德烈斯中央断层的时变深部形变的地震指标了解大深度板块边界断层带的时变形变场对于了解活动构造、断层-断层相互作用和大地震的发生具有重要意义。然而，由于范围有限，很难获得沿垂直走滑板块边界（如圣安德烈亚斯断层）的大规模时变深部变形的测量结果，大地测量的覆盖范围和采样频率以及基本贸易-为了更清楚地了解沿着断层深部瞬态变形的作用，在加州中部的安德烈亚斯断层（SAF）板块边界，分析了来自深断层带变形的新地震指标的数据，并与变形和中到大地震发生的大地测量进行了比较。新的地震指标分为两类：1）重复性微地震（用于推断深大断层地震滑动信息）和（2）深部非火山地震活动（深部次地震孕育岩石圈中幕式慢滑动事件的指示）。该项目将产生一个大的-沿SAF中部沿着175公里的地震活动的规模目录，目前还不存在，这将可能用于相关的研究。建议的活动也将包括一个研究生的博士论文的组成部分，将是本科生毕业论文的主要组成部分。结果将通过K-12图尔斯之旅和伯克利地震实验室的年度公众开放日向公众传播，并在会议和出版物上向科学界传播。研究结果也将纳入高年级本科课程加州地震（eps 130）。两名本科生也通过独立的研究课程（eps 199）参与了该项目的研究和正在进行的研究。项目活动将通过公众教育、学生教育和培训以及通过提供关于SAF板块边界沿着发生的复杂过程和该地区滑动亏损积累的时变方面的信息来造福社会，所有这些都是准确评估该地区活动构造所造成的地震危险的关键投入。

0544730NadeauSeismic Indicators of Time-Varying Deep Deformation along the Central San Andreas FaultUnderstanding the time-varying deformation field of plate bounding fault zones at great depthis important for understanding active tectonics, fault-fault interactions and the occurrence oflarge earthquakes. However, measurements of large-scale time-varying deep deformation alongvertical strike-slip plate boundaries such as the San Andreas Fault have been difficult to obtain,due to the limited extent, coverage and sampling frequency of geodetic measurements and thefundamental trade-offs and assumptions required to infer deep deformation on vertical faults from measurements of surface motion.To more clearly understand the role of deep transient deformation along the San AndreasFault (SAF) plate boundary in central California, data from new seismic indicators of deep faultzone deformation are analyzed and compared to geodetic measurements of deformation andmoderate to large earthquake occurrence. The new seismic indicators are of two types: 1)characteristically repeating microearthquakes (used to inferred deep-fault aseismic slipinformation) and 2) deep non-volcanic tremor activity (indicators of episodic slow-slip events inthe deep sub-seismogenic lithosphere).This project will produce a large-scale catalog of tremor activity along 175km of the central SAF that does not currently exist and that will likely be of use for relatedresearch. The proposed activity will also comprise a component of a graduate student's Ph.D.dissertation and will be a major component of an undergraduates senior thesis. Results will bedisseminated to the public through K-12 tours and annual public open houses of the BerkeleySeismological Lab and to the scientific community scientific community at meetings and inpublication . Results will also be incorporated into an upper-division undergraduate course onCalifornia Earthquakes (eps 130). Two undergraduates are also participating in the preliminaryand ongoing research through an independent research course (eps 199). Project activities willbenefit society through public education, education and training of students and by providinginformation on the complex processes occurring along the SAF plate boundary and the timevaryingaspects of slip-deficit accumulation in the region, all of which are critical inputs for theaccurate assessment of the seismic hazard posed by the active tectonics of this region.