Internal structure of the San Jacinto fault zone in the trifurcation area southeast of Anza, California, from data of dense seismic arrays
Internal structure of the San Jacinto fault zone in the trifurcation area southeast of Anza, California, from data of dense seismic arrays
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加利福尼亚州安扎东南部三分叉区圣哈辛托断层带的内部结构，来自密集地震台阵数据
DOI：
10.1093/gji/ggx540
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发表时间：
2017
影响因子：
2.8
通讯作者：
Vernon, F L
中科院分区：
文献类型：
--
作者：
Qin, L;Ben-Zion, Y;Qiu, H;Share, P-E;Ross, Z E;Vernon, F L
We image the internal structure of the San Jacinto fault zone (SJFZ) in the trifurcation area southeast of Anza, California, with seismic records from dense linear and rectangular arrays. The examined data include recordings from more than 20 000 local earthquakes and nine teleseismic events. Automatic detection algorithms and visual inspection are used to identifyPandSbody waves, along withP- andS-types fault zone trapped waves (FZTW). The location at depth of the main branch of the SJFZ, the Clark fault, is identified from systematic waveform changes across lines of sensors within the dense rectangular array. Delay times ofParrivals from teleseismic and local events indicate damage asymmetry across the fault, with higher damage to the NE, producing a local reversal of the velocity contrast in the shallow crust with respect to the large-scale structure. A portion of the damage zone between the main fault and a second mapped surface trace to the NE generatesP- andS-types FZTW. Inversions of high-qualityS-type FZTW indicate that the most likely parameters of the trapping structure are width of ∼70 m,S-wave velocity reduction of 60 per cent,Qvalue of 60 and depth of ∼2 km. The local reversal of the shallow velocity contrast across the fault with respect to large-scale structure is consistent with preferred propagation of earthquake ruptures in the area to the NW.
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DOI：
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