Recent advances in imaging crustal fault zones: a review

查看全文 作　　者：Hongfeng [1]Yang

机构地区：[1]Earth System Science Programme, The Chinese University of Hong Kong

出　　处：《Earthquake Science》索引2015年第28卷第2期,共12页

基　　金：supported by the startup fund (Grant 4930072);Direct Grant for Research (Grant 4053114) from the Chinese University of Hong Kong 摘　　要：Crustal faults usually have a fault core and surrounding regions of brittle damage, forming a low-velocity zone(LVZ) in the immediate vicinity of the main slip interface. The LVZ may amplify ground motion, influence rupture propagation, and hold important information of earthquake physics. A number of geophysical and geodetic methods have been developed to derive high-resolution structure of the LVZ. Here, I review a few recent approaches, including ambient noise cross-correlation on dense across-fault arrays and GPS recordings of fault-zone trapped waves. Despite the past efforts, many questions concerning the LVZ structure remain unclear, such as the depth extent of the LVZ. High-quality data from larger and denser arrays and new seismic imaging technique using larger portion of recorded waveforms, which are currently under active development, may be able to better resolve the LVZ structure. In addition, effects of the alongstrike segmentation and gradational velocity changes across the boundaries between the LVZ and the host rock on rupture propagation should be investigated by conducting comprehensive numerical experiments. Furthermore, high-quality active sources such as recently developed large-volume airgun arrays provide a powerful tool to continuously monitor temporal changes of fault-zone properties, and thus can advance our understanding of fault zone evolution. 关键词：地震成像技术断裂带地壳故障区域气枪阵列脆性破坏滑动界面地面运动

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Recent advances in imaging crustal fault zones: a review

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