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Volume 34 Issue 4
Aug.  2021
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Li LL, Yao HJ, Luo S, Li JH, Wang XL, Ni HY, and Bao ZW (2021). A multi-scale 3-D crust velocity model in the Hefei-Chao Lake area around the southern segment of Tanlu Fault Zone. Earthq Sci 34(4): 344–357, doi: 10.29382/eqs-2021-0020
Citation: Li LL, Yao HJ, Luo S, Li JH, Wang XL, Ni HY, and Bao ZW (2021). A multi-scale 3-D crust velocity model in the Hefei-Chao Lake area around the southern segment of Tanlu Fault Zone. Earthq Sci 34(4): 344–357, doi: 10.29382/eqs-2021-0020

A multi-scale 3-D crust velocity model in the Hefei-Chao Lake area around the southern segment of Tanlu Fault Zone

doi: 10.29382/eqs-2021-0020
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  • Corresponding author: hjyao@ustc.edu.cn
  • Received Date: 30 Apr 2021
  • Accepted Date: 10 Aug 2021
  • Rev Recd Date: 26 Jul 2021
  • Publish Date: 10 Oct 2021
  • Regional high-precision velocity models of the crust are an important foundation for examining seismic activity, seismogenic environments, and disaster distribution characteristics. The Hefei-Chao Lake area contains the main geological units of Hefei Basin, with thick sediments and the Chao Lake depression. Several major concealed faults of the southern NNE-trending Tanlu Fault Zone cross this area. To further explore the underground distribution characteristics of the faults and their tectonic evolutionary relationship with adjacent tectonic units, this study used ambient noise data recorded by a seismic array deployed in Hefei City and Chao Lake, constructing a 3-D velocity model at the depth of 1–8 km. Then a multi-scale high-resolution 3-D velocity model of this area was constructed by this new upper crustal velocity model with the previous middle and lower crustal model. The new model reveals that a high-velocity belt is highly consistent with the strike of the Tanlu Fault Zone, and a low-velocity sedimentary characteristic is consistent with the Hefei Basin and Chao Lake depression. The distribution morphology of high and low velocity bodies shows that the sedimentary pattern of Hefei-Chao Lake area is closely related to the tectonic evolution of the Tanlu Fault Zone since the Mesozoic. This study also identifies multiple low-velocity anomalies in the southeastern Hefei City. We speculate that strong ground motion during the 2009 Feidong earthquake (magnitude of 3.5) was related to amplification by the thick sediments in the Hefei Basin. We also discuss further applications of multi-scale high-resolution models of the shallow layer to strong ground motion simulations in cities and for earthquake disaster assessments.


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