Slip Rates on the Southern San Andreas Fault: Implications for Neotectonic, Seismic and Geodetic Models

南圣安德烈亚斯断层的滑动率：对新构造、地震和大地测量模型的影响

• 批准号: 0125741
• 负责人: Kerry Sieh
• 金额: $ 2.4万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0125741&HistoricalAwards=false
• 关键词: Slip; Rates; Southern; San; Andreas

The PI proposes to determine the slip rate of the San Andreas Fault at several sites in southern California using 10Be and 26Al measurements of the exposure ages of offset geomorphic surfaces. Determination of a millennial slip rate north of Los Angeles, on the flank of the Mojave Desert, would provide a critical constraint to the interpretation of geodetic data there. Rates of slip across the fault on each side of the San Gorgonio Pass stepover would constrain the relative importance of the several strands of the fault in that region. Within the complex restraining stepover, rates and dates of fault slip and folding would test a new model of transpressional deformation. They would do this by constraining the evolution of deformation there throughout the late Quaternary period. A quantitative understanding of active deformation would also provide a basis for forward models of future large earthquakes involving this ominously historically dormant section of the San Andreas Fault.

PI建议，使用10BE和26个测量偏移地球表面的暴露年龄来确定南加州几个地点的San Andreas断层的滑移速率。确定洛杉矶以北的千禧一代滑移率，在莫哈韦沙漠的侧面，将对那里的大地测量数据的解释产生关键的限制。 San Gorgonio Pass Stepover两侧的断层的滑动速率将限制该区域中断层几个链的相对重要性。在复杂的限制步骤中，故障滑移和折叠的速率和日期将测试新的转换变形模型。他们将通过限制整个第四纪晚期的变形演变来做到这一点。对主动变形的定量理解也将为未来大地震的前向模型提供基础，涉及圣安德烈亚斯断层的这一历史上不祥的处于休眠状态。