Steep-Dip Seismic Reflection Imaging of the Shallow San Andreas Fault

PI建议对美国地质勘探局在加利福尼亚州帕克菲尔德附近收集的5公里地震反射和折射数据进行补充数据分析。1998年的帕克菲尔德调查使用了适合于陡倾构造（如近垂直的圣安德烈亚斯断层）反射成像的采集参数，实验数据图证明了预期类型的断层面反射的存在。PI将采用叠前偏移来创建第一个地震反射图像，其中包括一个主要的近垂直走滑断层作为反射面。该方案产生的图像将直接约束地壳上1公里断裂带的位置和潜在的内部性质。

The PI proposes to perform supplemental data analyses on a 5-km line of combined seismic reflection and refraction data collected by the USGS near Parkfield, California. The 1998 Parkfield survey used acquisition parameters appropriate for imaging reflections from steeply dipping structures, such as the near-vertical San Andreas Fault, and data plots from the experiment demonstrate the existence of the expected type of fault-plane reflections. The PI will employ prestack migration to create the first-ever seismic reflection image that includes a major near-vertical strike-slip fault as a reflector. The image to be produced by this proposal will directly constrain location and potentially internal properties of the fault zone in the upper 1 kilometer of the crust.