High Resolution Simultaneous Tomographic Inversion for Attenuation and Velocity Structure at Loma Prieta, Using Local Earthquakes

本研究将使用来自永久和新的NSF/IRIS pascal仪器的地震数据，对与洛马普里塔地震序列相关的5000多次余震进行地震数据采集，以获得沿圣安德烈亚斯断层附近55 X 45公里区域的高分辨率（数百米量级）P波和s波速度和衰减的层析成像图像。最初，将检查单独的反演，并将其与已知的地质和地球物理观测相关联。将开发结合速度、衰减和重力的联合反演，要求得到的模型反映通过独立的地球物理观测所知道的模型。这项研究是国家减少地震危害计划的一个组成部分。

This research is to use seismic data from permanent and the new NSF/IRIS PASSCAL instruments for over 5000 aftershocks associated with the Loma Prieta earthquake sequence to derive high resolution (on the order of hundreds of meters) tomographic images of P- and S-wave velocity and attenuation along a 55 X 45 km region near the San Andreas fault. Initially, separate inversions will be examined and correlated with known geologic and geophysical observations. A joint inversion, incorporating velocity, attenuation and gravity will be developed requiring the resulting models to reflect what is known about the model through independent geophysical observations. This research is a component of the National Earthquake Hazard Reduction Program.