CAREER: Re-evaluating the evolution of the southern San Andreas Fault along its restraining bend from Holocene to Mid-Quaternary timescales via 36Cl/10Be burial and cosmogenic...

这项研究将重新评估构成圣安德烈亚断层系统南部的各个断层的地震危险性，特别是与新发现的圣安德烈亚斯断层系统的一个断层有关的潜在危险。调查将记录和描述这条新发现的断层在多个时间尺度上的运动量，以更好地了解其相对于该地区其他断层的位移历史和演化。为了实现这一目标，将开发一种新的测年技术--36Cl/10Be埋葬测年。这项研究的社会影响很大，因为研究结果将有助于完善地震风险模型，预测加州未来地震及其复发的可能性。这项关于发震断层的研究随后将被整合到一个面向本科生的地点指导计划中，以促进圣何塞州立大学(SJSU)的本科生地质学研究经历(PURE)。该项目将为学生提供调查故障过程及其相关危险的机会。在20万至70万年的沉积物中进行36Cl/10Be埋藏测年技术的开发和应用将扩大地球科学家量化地质过程的能力和能力，例如在大多数地质史上缺失的一个时间尺度上全世界侧向断层、褶皱和逆冲带的变形速率和沉积序列。因此，将断层和断裂带的连续位移史量化到第四纪中期，将为了解大陆走滑断层，特别是圣安德烈亚斯断层的行为提供新的见解。这些数据对于理解断层系统的演化至关重要。多个地点和时间尺度的详细野外和地质年代学数据提供了重要的约束和边界条件，可用于板块边界应变、断层、动态地震破裂模型、地震模型和地震危险性评估模型。该项目的资金由EAR构造计划和地球观测组织极端事件预测和抵御极端事件(PREEVENTS)计划提供。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This study will re-evaluate the seismic hazard potential of individual faults that make up the southern San Andrea Fault system, in particular the potential hazard associated with a newly identified fault of the San Andreas Fault system. The investigation will document and characterize the amount of movement along this newly identified fault over multiple timescales, to better understand its displacement history and evolution relative to other faults in the region. To accomplish this end goal, the application of a new dating technique, 36Cl/10Be burial dating, will be developed. The societal impact of this study is high because the results will help refine earthquake hazard models that forecast the potential of future earthquakes and their recurrence in California. This study of seismogenic faults will then be integrated into a place-based mentoring program for undergraduate students, Promoting Undergraduate Research Experiences (PURE) in Geology at San Jose State University (SJSU). The program will provide opportunities for students to investigate fault processes and their associated hazard. The development and application of the 36Cl/10Be burial dating technique in sediment over the 200,000 to 700,000 year age range will expand the capability and capacity of earth scientists to quantify geologic processes, such as rates of deformation of lateral faults, fold and thrust belts and sedimentary successions worldwide over a timescale missing in most geologic histories. Accordingly, quantifying the continuous displacement history of faults and fault zones into mid-Quaternary timescales will provide new insights into the behavior of continental strike slip faults, in particular the San Andreas Fault. Such data are critical to understanding the evolution of fault systems. Detailed field and geochronologic data at multiple locations and timescales provide important constraints and boundary conditions that can be applied to geophysical models of plate boundary strain, faults, dynamic earthquake rupture models, seismologic models and models assessing seismic hazard. Funding for the project is provided by the EAR Tectonics Program and the GEO Prediction of and Resilience against Extreme Events (PREEVENTS) Program.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.