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Crustal thickness beneath the Tanlu fault zone and its tectonic significance based on two-layer h-κstacking

Earthquake Science 2021年第1期34卷 47-63页

作者： Lingli Li Weisen Shen Siyuan Sui huajian Yao Ziwen Bao Anhui Earthquake Agency Hefei 230031China Stony Brook University New York 11794USA School of Earth and Space Science University of Science and Technology of ChinaHefei 230026China

Tanlu fault zone(TLFZ)is the largest active fault zone in eastern *** is characterized by complex tectonic evolution and multiple faults and marks the boundary between the North and South China *** indepth understanding of the distinct crustal structures of both parts of the TLFZ will provide valuable insights into the lithospheric and crustal thinning in eastern China,extensive magmatism since the Mesozoic,and formation mechanisms of metallogenic belts along the Yangtze *** this study,a two-layer h-κstacking approach was adopted to estimate the thicknesses of the sediment and crystalline crust as well as the corresponding vP/vS ratios based on high-quality teleseismic P-wave receiver functions recorded by permanent and temporary stations in and around the *** geological units in the study region were delineated,especially the crustal structures beneath extensive sedimentary basins on both sides of the *** following conclusions can be drawn:(1)The crustal thickness in and around the TLFZ greatly varies depending on the *** the northern segment,the crust is relatively thin beneath the eastern part of the Songliao Basin,a broad uplift of the Moho can be observed,and the Moho descends from south to *** crust below the central and southern segments becomes thinner from west to *** thickness of the crust is less than 30 km toward the eastern side of the boundary between the Jiangsu and Anhui provinces,that is,significantly thinner than in other *** terms of the vP/vS ratios,high anomalies were detected in the central-southern segments of the TLFZ,indicating the upwelling of deep mantle magma via deep faults.(2)Positive isostatic gravity anomalies were observed in the eastern part of the northern segment of the TLFZ and in the eastern part of the Suwan *** crustal thickness is smaller than that obtained from the Airy model of *** suggests that the lower crust in this area may have experienced intensive tra

关键词： sediment layer P-wave receiver function crustal thickness Tanlu fault zone two-layer h-κstacking

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