防灾与环境

高邮—宝应Ms4.9地震发震构造三维精细建模

  • 王金艳 ,
  • 汪晴慧 ,
  • 朱程程 ,
  • 张浩
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  • 1.江苏省地震局,南京 210014;
    2.南京工业大学 交通运输工程学院,南京 210009
王金艳(1982—),女,吉林抚松人,硕士,高级工程师,主要从事地震地质、三维构造建模等领域研究工作。E-mail: 117001305@qq.com

收稿日期: 2025-09-15

  网络出版日期: 2026-09-07

基金资助

中国地震局地震科技星火计划攻关项目(XH24013B);江苏省地震局局长科学基金(202402)

Three-Dimensional High-Resolution Modeling of the Seismogenic Tectonics Associated with the Gaoyou-Baoying Ms 4.9 Earthquake

  • Wang Jinyan ,
  • Wang Qinghui ,
  • Zhu Chengcheng ,
  • Zhang Hao
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  • 1. Jiangsu Earthquake Agency, Nanjing 210014, P.R. China;
    2. School of Transportation Engineering, Nanjing Tech University, Nanjing 210009, P.R. China

Received date: 2025-09-15

  Online published: 2026-09-07

摘要

2012年7月20日江苏高邮—宝应Ms 4.9地震发生于中国东部弱震区,其发震构造尚存争议。构建震源区精细三维断裂模型对理解发震机制与区域地震危险性具有重要意义。以高邮—宝应震区为研究对象,综合运用断裂地表迹线、震源机制解、小震精定位、浅层及深地震反射剖面等多源数据,采用基于离散光滑插值(DSI)的隐式函数建模方法,通过多轮迭代与敏感性分析,解决了多源数据权重分配与空间耦合等关键问题,构建了该区高精度三维发震断裂模型。结果表明:主震及余震序列集中分布于一条NNE走向、SEE倾向、倾角介于69°~85°的右旋走滑断裂的“S”形弯曲段落,该断裂面向深部逐渐变陡,最终收敛于上地壳结晶基底顶面,切割深度约20 km;综合分析确认发震构造为高邮凹陷西北边界的杨汊苍—桑树头断裂;建立了多源数据差异化权重约束策略与定量化残差控制流程,显著提升了模型收敛性与可靠性;将隐式函数与DSI算法相结合的方法,具有较强的可重复性与推广性。研究成果为高邮—宝应地震的发震机制判定提供了关键构造模型,可为中国东部类似震区的深部构造探测和地震危险性分析提供参考。

本文引用格式

王金艳 , 汪晴慧 , 朱程程 , 张浩 . 高邮—宝应Ms4.9地震发震构造三维精细建模[J]. 地下空间与工程学报, 2026 , 22(4) : 1498 -1509 . DOI: 10.20174/j.JUSE.2026.04.37

Abstract

On July 20, 2012, the Gaoyou-Baoying Ms 4.9 earthquake occurred in a seismically weak area of eastern China, and its seismogenic structure remains controversial. Constructing a detailed three-dimensional fault model of the source region is crucial for understanding the seismogenic mechanism and assessing regional seismic hazards. This study focuses on the Gaoyou-Baoying seismic zone and, for the first time, integrates multi-source data including surface fault traces, focal mechanism solutions, precisely relocated aftershocks, shallow and deep seismic reflection profiles. Using an implicit-function modeling approach based on the Discrete Smooth Interpolation (DSI) algorithm, along with multiple rounds of iteration and sensitivity analysis, this study effectively addresses key issues such as weight allocation for multi-source data, and spatial coupling was effectively addressed, resulting in the construction of a high-precision 3D seismogenic fault model. The model reveals that the mainshock and aftershock sequences are concentrated along an S-shaped segment of a right-lateral strike-slip fault with an NNE strike, SEE dip, and dip angles ranging between 69° and 85°. The fault steepens with depth and ultimately converges at the top of the upper crustal crystalline basement, with a cutting depth of approximately 20 km. Comprehensive analysis confirms that the seismogenic structure is the Yangchacang-Sangshutou fault at the northwestern boundary of the Gaoyou Sag. This study establishes a differentiated weight constraint strategy for multi-source data and a quantitative residual control process, significantly improving model convergence and reliability. The innovative integration of implicit functions and the DSI algorithm offers strong reproducibility and generalizability, providing not only a key tectonic model for determining the seismogenic mechanism of the Gaoyou-Baoying earthquake but also a new technical approach and scientific basis for deep structural exploration and seismic hazard assessment in similar seismic zones of eastern China.

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