[1]段美芳,陈 佳,贾漯昭,等.2017年漾濞MS5.1和2021年漾濞MS6.4地震前后构造应力场动态变化特征[J].华南地震,2026,46(05):12-19.[doi:10.13512/j.hndz.2026.05.02]
　DUAN Meifang,CHEN Jia,JIA Luozhao,et al.Dynamic Characteristics of the Tectonic Stress Field Before and After the 2017 Yangbi MS5.1 Earthquake and the 2021 Yangbi MS6.4 Earthquake[J].,2026,46(05):12-19.[doi:10.13512/j.hndz.2026.05.02]
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2017年漾濞MS5.1和2021年漾濞MS6.4地震前后构造应力场动态变化特征()

华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
46
期数:
2026年05期
页码:
12-19
栏目:
地震科学研究
出版日期:
2026-09-07

文章信息/Info

Title:
Dynamic Characteristics of the Tectonic Stress Field Before and After the 2017 Yangbi MS5.1 Earthquake and the 2021 Yangbi MS6.4 Earthquake
文章编号:
1001-8662（2026）05-0012-08
作者:
段美芳1; 2; 陈 佳1; 2; 贾漯昭3; 杨建文1; 2; 李 见1; 2; 高 琼1; 2
1.中国地震科学实验场大理中心，云南 大理 671000;2.云南大理滇西北地壳构造活动中国地震局野外科学观测研究站，云南 大理 671000;3.河南省地震局，郑州 450018
Author(s):
DUAN Meifang1; 2; CHEN Jia1; 2; JIA Luozhao3; YANG Jianwen1; 2; LI Jian1; 2; GAO Qiong1; 2
1.Dali Center of China Earthquake Science Experimental Site, Dali 671000, China;2.Northwestern Yunnan Crustal Tectonics Observatory of China Earthquake Administration, Dali 671000, China;3.Henan Earthquake Agency, Zhengzhou 450018, China
关键词:
FOCMEC方法; 2017年漾濞MS5.1地震; 2021年漾濞MS6.4地震; 震源机制; 构造应力场
Keywords:
FOCMEC method;  2017 Yangbi MS5.1 earthquake;  2021 Yangbi MS6.4 earthquake;  Focal mechanism; Tectonic stress field
分类号:
P315.7
DOI:
10.13512/j.hndz.2026.05.02
文献标志码:
A
摘要:
基于FOCMEC方法计算了2008—2025年漾濞地区129个2.0≤ML<3.5地震的震源机制解，结合收集到的412个ML≥3.5地震的震源机制结果，采用阻尼应力张量方法反演了漾濞2017年MS5.1和2021年MS6.4地震发生前后的区域应力场，并分析了其动态演变特征。结果表明：研究区地震以走滑型为主，正断型次之，区域构造应力场总体表现为NS向挤压和EW向拉张，具有明显的走滑性质；2017年漾濞MS5.1地震前（2008年1月1日至2017年2月26日），应力分布相对分散；2017年漾濞MS5.1地震后至2021年漾濞MS6.4地震前（2017年2月28日至2021年5月20日），应力明显集中，应力形因子R值均低于0.5，反映了强烈的挤压作用与强震孕育条件；2021年漾濞MS6.4地震后（2021年5月22日至2025年7月31日），应力集中度下降，应力形因子R值低于0.5，但较主震前有所升高，表明挤压作用减弱，应力有所释放；漾濞2017年MS5.1和2021年MS6.4地震发生前后主压应力方向总体均呈NNW—SSE向，但主震均发生在局部应力方向转为近NS或NNE向的过渡区。综合分析认为，应力场方向发生偏转与局部应力集中增强，可作为识别该地区未来中强震潜在危险区的一个重要标志。
Abstract:
Based on the FOCMEC method, the study calculates the focal mechanism solutions of 129 earthquakes with 2.0≤ML<3.5 in the Yangbi area from 2008 to 2025 were calculated. Combined with the focal mechanism results of 412 earthquakes with magnitudes of ML≥3.5 collected, the damped stress tensor inversion method is adopted to invert the regional stress field before and after the 2017 Yangbi MS5.1 and 2021 Yangbi MS6.4 earthquakes, and the dynamic evolution characteristics were analyzed. The results show that: The earthquakes in the study area are mainly strike-slip type, followed by normal fault type. The regional tectonic stress field is generally characterized by north-south(NS) compression and east-west(EW) tension, with obvious strike-slip properties. Before the 2017 MS5.1 earthquake in Yangbi (from January 1, 2008 to February 26, 2017), the stress distribution was relatively dispersed;from the 2017 MS5.1 earthquake to the 2021 MS6.4 earthquake (from February 28, 2017 to May 20, 2021), obvious stress concentration was observed, and the stress shape factor R value was all below 0.5, indicating intense tectonic compression and favorble seismogenic conditions for strong earthquakes. After the 2021 MS6.4 earthquake in Yangbi (from May 22, 2021 to July 31, 2025), the stress concentration decreased, and the stress shape factor R value was below 0.5 but higher than before the main shock, suggesting weakened tectonic compression and partial stress released. The direction of the principal compressive stress before and after the 2017 MS5.1 and 2021 MS6.4 earthquakes in Yangbi was generally NNW-SSE, but the main shocks occurred in the transition zone where the local stress direction turned to nearly NS or NNE. Comprehensive analysis indicates that the stress field deflection and enhanced local stress concentration can be used as an important indicator for identifying potential dangerous areas for future moderate to strong earthquakes in this region.

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备注/Memo

备注/Memo:
收稿日期：2026-01-26
基金项目：云南省地震局青年基金（2024K09）；中国地震局星火计划攻关项目（XH25016A）；云南省地震科技创新团队（CXTD202506）联合资助。
作者简介：段美芳（1994-），女，工程师，主要从事震源机制及应力场研究工作。E-mail: duanmeifangfang@163.com
更新日期/Last Update: 2026-09-20