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ORIGINAL RESEARCH article
Front. Phys.
Sec. Interdisciplinary Physics
Volume 12 - 2024 |
doi: 10.3389/fphy.2024.1502248
This article is part of the Research Topic Physics and Mechanics Underlying Geomaterial Instability View all 5 articles
Velocity Structure of Crust and Mid-Strong Earthquake Preparation Characteristics in the Huoshan Region, East China
Provisionally accepted
Tiantian Hu
1
Xiaoping Fan
2*
Yicheng He
3*
Longshuai Yang
4
Congjie Yang
3
Pengcheng Jiang
1
Zhiwen Liu
2
Ziyan Xia
2
Menghui Xu
2
Yuhan Wu
2- 1 Nanjing Shanhai Engineering Technology Co., Ltd, Nanjing, China
- 2 Nanjing Tech University, Nanjing, Jiangsu Province, China
- 3 Jiangsu Earthquake Agency, Nanjing, China
- 4 East-China Metallurgical Institute of Geology and Exploration, Heifei, China
The Huoshan region, located on the northern margin of the Dabie Orogenic Belt at the junction of the North China Plate and the Yangtze Plate, is one of the most seismically active and concentrated areas in the Dabie Orogenic Belt and adjacent regions. Utilizing the travel time data from 4,427 seismic events observed by 202 stations, we investigated the deep medium structure of the Huoshan region using the double-difference tomography method. The results reveal the medium structure and characteristics of mid-strong earthquake preparation in the region. The crustal medium in the study area exhibits significant lateral heterogeneity. The Dabie Orogenic Belt shows notably high velocity, whereas the North China Plate and the Yangtze Plate display relatively lower velocities. The Tan-Lu Fault Zone exhibits segmentation characteristics; with the crustal medium velocity south of Lujiang being relatively high, north of Jiashan being relatively low, and between Lujiang and Jiashan being intermediate. The epicenters of mid-strong earthquakes are located on the gradient zones of velocity and Poisson's ratio. The source regions of these earthquakes show significant anomalies of high Poisson's ratio and low S-wave velocity, which may indicate the presence of fluids. These anomalies possibly reflect the intrusion of deep materials along the fault zone, which could be the driving force for the preparation of mid-strong earthquakes.
Keywords: Huoshan region, Seismogenic environment, double-difference tomography, Deep fluids, Crustal structure
Received: 26 Sep 2024; Accepted: 06 Nov 2024.
Copyright: © 2024 Hu, Fan, He, Yang, Yang, Jiang, Liu, Xia, Xu and Wu. 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, 211816, Jiangsu Province, China
Yicheng He, Jiangsu Earthquake Agency, Nanjing, China
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