SGER: A Pilot Study on Imaging Bimaterial Interfaces Along the North Anatolian Fault With Fault Zone Head Waves

拟议的试点研究与记录北安那托利亚断层的微震活动和断裂带波形有关，该断层在1944年的M=7.3地震中破裂，部分正在蠕动。主要目标是成像断裂带结构中的双物质界面，并在较小程度上澄清沿该断裂带部分的微地震活动模式。通过对北安那托利亚断层破坏不对称性的详细地质观测，头波的分析将为预测整个研究区域的速度对比意义提供检验。这些结果将有助于提高对北安那托利亚断层的长期演化、内部组织和地震潜力的理解。大断层上地震传播方向的可能统计偏好问题对伊斯坦布尔、旧金山和洛杉矶等大城市的地震震动危险性估计具有深远的影响。对记录的局部微震活动模式的分析将有助于对大型大陆走滑断层爬行剖面的认识。该研究将与土耳其伊斯坦布尔Kandilli天文台的Mustafa Aktar教授小组合作完成，并将成为南加州大学研究生和Kandilli学生/研究员教育的一部分。该SGER由国际科学与工程办公室、ANESA项目和GEO/EAR的地球物理项目共同资助。

The proposed pilot study is associated with recording microseismicity and fault zone waveforms along a section of the North Anatolian fault that ruptured in the M=7.3 1944 earthquake and is partially creeping. The main goals are to image bimaterial interfaces in the fault zone structure, and to a lesser extent also to clarify the microseismicity patterns along that section of the fault. The analysis of head waves will provide a test for the predicted sense of the velocity contrast across the study area based on the detailed geological observations of damage asymmetry across the North Anatolian fault.The results will contribute to developing improved understanding of the long-term evolution, internal organization and seismic potential of the North Anatolian fault.The issue of possible statistical preference of earthquake propagation directions on large faults can have profound implications for estimates of seismic shaking hazard in large metropolitan areas like Istanbul, San Francisco and Los Angeles. Analysis of the recorded local microseismicity patterns will contribute to the understanding of creeping sections of large continental strike-slip faults. The study will be done in collaboration with the group of Prof. Mustafa Aktar from the Kandilli Observatory in Istanbul, Turkey, and will form parts of the education of USC graduate student and Kandilli student/researcher. This SGER is jointly funded by the Office of International Science and Engineering, ANESA program, and the Geophysics program in GEO/EAR.