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ORIGINAL RESEARCH article
Front. Phys.
Sec. Interdisciplinary Physics
Volume 12 - 2024 |
doi: 10.3389/fphy.2024.1458844
This article is part of the Research Topic Physics and Mechanics Underlying Geomaterial Instability View all articles
Shallow Crustal Structure Detection Of The Upper Crust At Anqiu-Juxian Fault In The Tanlu Fault Zone
Provisionally accepted- 1 Nanjing Tech University, Nanjing, China
- 2 Earthquake Administration of Jiangsu Province, Nanjing, Liaoning Province, China
Within the Tan-Lu Fault Zone, the largest active tectonic belt in eastern China, the Anqiu-Juxian Fault exhibits the most recent activity period, evident surface traces, and highest seismic hazard, making it a Holocene active fault. This study utilized the vertical component continuous data observed by 100 short-period temporary stations from August 1-21, 2023, and extracted 1,944 Rayleigh wave group velocity dispersion curves within the period of 0.2-4 s. Using the direct surface wave tomography method, we calculated a high-resolution 3-D shear-wave velocity structure at depths of 0.2-1.25 km within the study area. Our results are summarized as follows: (1) The development of faults F1, F2, and F5 in the Tan-Lu Fault Zone highly correlated with the shear-wave velocity anomalies at depths > 0.8 km. Specifically, fault F5 comprised two boundary faults, F5-1 and F5-2, which together controlled a Cenozoic depression covered by a thick, low-velocity sediment layer. (2) The complex velocity structure characteristics in the Suqian area revealed that the influence of faults on the sedimentary layers in the Suqian area was not expressed as an overall uplift or subsidence of the block but rather as differential subsidence. (3) Near Sankeshu, the F5 fault formed a small pull-apart basin. The latest activity in this pull-apart basin has shifted to the fault in the center of the basin, indicating that the pull-apart basin has entered the extinction stage.
Keywords: Tanlu fault zone, Anqiu-Juxian Fault, Ambient noise tomography, Shallow crustal structure, Shear-wave velocity
Received: 03 Jul 2024; Accepted: 27 Aug 2024.
Copyright: © 2024 Huang, Fan, Fu, Zhang, Zheng, Liu, Zhang, Ren, Wang, Liu and Qian. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Xiaoping Fan, Nanjing Tech University, Nanjing, China
Wei Fu, Nanjing Tech University, Nanjing, China
Peng Zhang, Nanjing Tech University, Nanjing, China
Tuo Zheng, Nanjing Tech University, Nanjing, China
Yunze Liu, Nanjing Tech University, Nanjing, China
Tiantian Zhang, Nanjing Tech University, Nanjing, China
Shiyu Ren, Nanjing Tech University, Nanjing, China
Qinghui Wang, Nanjing Tech University, Nanjing, China
Zhiwen Liu, Nanjing Tech University, Nanjing, China
Ting Qian, Earthquake Administration of Jiangsu Province, Nanjing, Liaoning Province, China
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