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 提议使用 10Be 和 26Al 测量偏移地貌表面的暴露年龄来确定南加州几个地点的圣安德烈亚斯断层的滑动率。确定洛杉矶以北、莫哈韦沙漠侧翼的千年滑移率，将为那里的大地测量数据的解释提供一个关键的约束。圣戈尔戈尼奥山口跨步两侧断层的滑移率将限制该地区几条断层的相对重要性。在复杂的约束步距内，断层滑动和褶皱的速率和日期将测试新的压变形模型。他们将通过限制整个第四纪晚期的变形演化来做到这一点。对活动变形的定量理解也将为涉及圣安德烈亚斯断层这段不祥的历史休眠部分的未来大地震的正演模型提供基础。