郯庐断裂带安丘-莒县断层上地壳浅部构造探测

IF 1.9 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Qilong Huang, Xiaoping Fan, Wei Fu, Peng Zhang, Tuo Zheng, Yunze Liu, Tiantian Zhang, Shiyu Ren, Qinghui Wang, Zhiwen Liu, Ting Qian
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引用次数: 0

摘要

在中国东部最大的活动构造带--郯庐断裂带中,安丘-莒县断裂活动期最晚、地表痕迹最明显、地震危险性最高,属于全新世活动断层。本研究利用 2023 年 8 月 1-21 日 100 个短周期临时台站观测到的垂直分量连续数据,提取了 0.2-4 秒内的 1944 条瑞利波群速度频散曲线,采用直接面波层析成像方法,计算了研究区内 0.2-1.25 km 深的高分辨率三维剪切波速度结构。我们的研究结果总结如下1)郯庐断裂带 F1、F2 和 F5 断层的发育与深度 &gt;0.8 km 的剪切波速度异常高度相关。具体地说,断层 F5 包括两个边界断层 F5-1 和 F5-2,它们共同控制着一个新生代洼地,该洼地被厚厚的低速沉积层所覆盖。2)宿迁地区复杂的速度结构特征表明,断层对宿迁地区沉积层的影响并不表现为区块的整体抬升或下沉,而是表现为不同程度的下沉。3) 在三棵树附近,F5 断层形成了一个小的拉隔盆地。该拉开盆地的最新活动已转移到盆地中心的断层上,表明该拉开盆地已进入消亡阶段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shallow crustal structure detection of the upper crust at Anqiu-Juxian Fault in the Tanlu fault zone
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 &gt;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.
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来源期刊
Frontiers in Physics
Frontiers in Physics Mathematics-Mathematical Physics
CiteScore
4.50
自引率
6.50%
发文量
1215
审稿时长
12 weeks
期刊介绍: Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.
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