Subsurface Geometry of Active Faults in the Southern San Andreas System

南圣安地列斯系统活动断层的地下几何结构

• 批准号: 9005302
• 负责人: John Louie
• 金额: $ 5万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005302&HistoricalAwards=false
• 关键词: Subsurface; Geometry; Active; Faults; Southern

This research is an extension of an ongoing project to image the subsurface geometry of active faults associated with the San Andreas system in southern California. The geometry of mapped active faults will be found by pre-stack migration of existing seismic reflection datasets. The imaged faults will be related to regional deep crustal structures and tested for evidence of Poisson's ratio variations from amplitude-versus-offset trends, suggesting tectonically-active zones of weakness. Data from the EDGE and Calcrust projects will be used to investigate the Santa Maria Basin and Tehachapi Mountains areas. This research is a component of the National Earthquake Hazard Reduction Program.

这项研究是一个正在进行的项目的延伸，该项目旨在对南加州圣安德烈亚斯系统相关的活动断层的地下几何形状进行成像。通过对已有地震反射数据集的叠前偏移，可以得到活动断层的几何形状。成像断层将与区域深部地壳结构相关，并测试泊松比变化的证据，从振幅与偏移趋势，表明构造活动区的弱点。EDGE和Calcrust项目的数据将用于调查圣玛丽亚盆地和德哈查皮山脉地区。这项研究是国家减少地震危害计划的一个组成部分。