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

PI计划利用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速率。确定洛杉矶以北莫哈韦沙漠侧翼的千年滑动率，将为那里的大地测量数据的解释提供一个关键的约束。圣戈尼奥山口两侧断层的滑动速率将限制该地区几条断层的相对重要性。在复杂的抑制作用下，断层滑动和褶皱的速率和时间将检验一种新的逆挤压变形模式。他们会通过限制整个晚第四纪的变形演化来做到这一点。对活动变形的定量理解也将为未来大地震的正演模型提供基础，这些大地震涉及圣安德烈亚斯断层这一不祥的历史休眠部分。

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.