Article(id=1322567114590897039, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322567020940481144, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2025.06.194, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1749398400000, receivedDateStr=2025-06-09, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793254172226, onlineDateStr=2026-10-29, pubDate=1776182400000, pubDateStr=2026-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793254172226, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793254172226, creator=13701087609, updateTime=1793254172226, updator=13701087609, issue=Issue{id=1322567020940481144, tenantId=1146029695717560320, journalId=1281212831689347082, year='2026', volume='46', issue='4', pageStart='392', pageEnd='521', issueExtLink='null', onlineDate='null', pubDate='1776182400000', pubDateStr='2026-04-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793254149899, creator='13701087609', updateTime=1793254149899, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=443, endPage=450, ext={EN=ArticleExt(id=1322567115069047696, articleId=1322567114590897039, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Focal Mechanisms and Stress Field Characteristics in Western Yunnan Region, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

We collect the focal mechanisms of M≥3.0 earthquakes in western Yunnan region from 2013 to 2024, use the superimposed stress field method to carry out regional tectonic stress inversion, and investigate the spatiotemporal evolution characteristics of focal mechanism consistency before and after M≥5.0 earthquakes. The results show that the focal mechanism in the study area is mainly slip-type, supplemented by normal fault type. The plunge angles of P-axis and T-axis are small, and the fault plane is mostly high dipping. The stress type in the study area is slip-type. The compressive stress is mainly in the direction of NE to NNE, with a better consistency, while the tension stress is dominant in the direction of SEE. The dip angles of compressive stress and tension stress are small and close to the horizontal in western Yunnan. The study area is mainly characterized by horizontal stress and is subject to horizontal compression in the NE to NNE direction and tension in the SEE direction. The M≥5.0 earthquakes occurred in areas with low variance of stress tensor or their edges, and the stress tensor variance experienced the process of decreasing from the peak before the earthquake. The continuous decrease or low level of stress tensor variance may be closely related to the risk of moderate earthquakes in the western Yunnan, but the relationship between them is not unique, and can be comprehensively analyzed by combining with other parameters, such as the low b-value. The research findings provide a reference for analyzing seismic source characteristics, studying tectonic stress, and tracking seismic activity in the study area.

, authors=Jian LI1, Jianwen YANG1, *, Jia CHEN1, Jun WANG1, Qiong GAO1, Chengzhu ZI1, Meifang DUAN1, authorsList=Jian LI, Jianwen YANG, Jia CHEN, Jun WANG, Qiong GAO, Chengzhu ZI, Meifang DUAN, authorCompany=null, correspAuthors=Jianwen YANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=All rights reserved. Unauthorized reproduction is prohibited., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322567117627573153, articleId=1322567114590897039, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=小滇西地区震源机制及应力特征分析, columnId=1281933709121138897, journalTitle=大地测量与地球动力学, columnName=地球动力学, runingTitle=null, highlight=null, articleAbstract=

收集2013-2024年云南小滇西地区M≥3.0地震震源机制解, 采用叠加应力场方法反演区域构造应力及M≥5.0地震前后震源机制一致性时空演化特征。结果表明, 研究区震源机制以走滑型为主, 正断型为辅, P轴、T轴倾伏角较小, 断层面多为高倾角; 小滇西地区应力类型为走滑型, 压应力方位以NE-NNE向为主, 一致性较好, 张应力以SEE向为优势方向, 压应力和张应力倾伏角较小且接近水平, 研究区以水平应力为主, 受NE-NNE向水平挤压和SEE向拉张作用; 小滇西地区M≥5.0地震发生在应力张量方差低值区或其边缘, 且震前经历了应力张量方差由峰值趋势下降的过程, 研究区应力张量方差持续下降或处于较低水平可能与中强地震危险性密切相关, 但二者关系不唯一, 可联合低b值等其他参数综合跟踪分析。本文研究结果可为研究区地震震源特征分析、构造应力研究及震情跟踪提供参考。

, authors=李见1, 杨建文1, *, 陈佳1, 王军1, 高琼1, 字承柱1, 段美芳1, authorsList=李见, 杨建文, 陈佳, 王军, 高琼, 字承柱, 段美芳, authorCompany=null, correspAuthors=杨建文, authorNote=

李见, 工程师, 主要从事地震震源机制及地震监测研究, E-mail:

, correspAuthorsNote=
杨建文, 高级工程师, 主要从事地震学研究, E-mail:
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F1:大盈江断裂;F2:龙陵-瑞丽断裂;F3:畹町断裂;F4:柯街断裂;F5:南汀河断裂;F6:澜沧江断裂;F7:怒江断裂

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Crust velocity model used in CAP inversion

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地壳厚度/km VP/km·s-1 VS/km·s-1
1.25 4.30 2.10
16.75 5.92 3.43
18.00 6.49 3.60
9.00 6.93 3.74
50.00 7.96 4.35
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CAP反演使用的地壳速度模型

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地壳厚度/km VP/km·s-1 VS/km·s-1
1.25 4.30 2.10
16.75 5.92 3.43
18.00 6.49 3.60
9.00 6.93 3.74
50.00 7.96 4.35
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Statistics of focal mechanisms in the study area

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应力类型 倾角 数量/个 占比/%
P轴/(°) B轴/(°) T轴/(°)
正断型(NF) ≥52° ≤35° 15 12.9
正走滑型(NS) ≥40°且<52° ≤20° 4 3.4
走滑型(SS) <40°
≤20°
≥45° ≤20°
≥20°且<40°
74 64.0
逆走滑型(TS) ≤20° ≥40°且<52° 6 5.2
逆断层型(TF) ≤35° ≥52° 5 4.3
不确定型(UD) ≥25°且≤45° ≥25°且≤45° ≥25°且≤45° 14 12.1
≥40°且≤50° ≥40°且≤50°
), ArticleFig(id=1322567125307343843, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322567114590897039, language=CN, label=表2, caption=

研究区震源机制统计结果

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应力类型 倾角 数量/个 占比/%
P轴/(°) B轴/(°) T轴/(°)
正断型(NF) ≥52° ≤35° 15 12.9
正走滑型(NS) ≥40°且<52° ≤20° 4 3.4
走滑型(SS) <40°
≤20°
≥45° ≤20°
≥20°且<40°
74 64.0
逆走滑型(TS) ≤20° ≥40°且<52° 6 5.2
逆断层型(TF) ≤35° ≥52° 5 4.3
不确定型(UD) ≥25°且≤45° ≥25°且≤45° ≥25°且≤45° 14 12.1
≥40°且≤50° ≥40°且≤50°
), ArticleFig(id=1322567125458338788, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322567114590897039, language=EN, label=Tab. 3, caption=

The best stress tensor inversion results in the study area

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最大主应力S1 中间主应力S2 最小主应力S3 应力形因子φ 应力类型
方位/(°) 倾伏角/(°) 方位/(°) 倾伏角/(°) 方位/(°) 倾伏角/(°)
20.3 2.2 -88.8 83.2 110.5 6.4 0.62 走滑型
), ArticleFig(id=1322567125529641957, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322567114590897039, language=CN, label=表3, caption=

研究区最优应力张量反演结果

, figureFileSmall=null, figureFileBig=null, tableContent=
最大主应力S1 中间主应力S2 最小主应力S3 应力形因子φ 应力类型
方位/(°) 倾伏角/(°) 方位/(°) 倾伏角/(°) 方位/(°) 倾伏角/(°)
20.3 2.2 -88.8 83.2 110.5 6.4 0.62 走滑型
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小滇西地区震源机制及应力特征分析
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李见 1 , 杨建文 1, * , 陈佳 1 , 王军 1 , 高琼 1 , 字承柱 1 , 段美芳 1
大地测量与地球动力学 | 地球动力学 2026,46(4): 443-450
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大地测量与地球动力学 |地球动力学 2026 , 46 (4) : 443 -450
小滇西地区震源机制及应力特征分析
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李见1 , 杨建文1, * , 陈佳1, 王军1, 高琼1, 字承柱1, 段美芳1
作者信息
  • 1 云南省地震局, 昆明, 650224
通讯作者:
杨建文, 高级工程师, 主要从事地震学研究, E-mail:
作者简介:

李见, 工程师, 主要从事地震震源机制及地震监测研究, E-mail:

Focal Mechanisms and Stress Field Characteristics in Western Yunnan Region
Jian LI1 , Jianwen YANG1, * , Jia CHEN1, Jun WANG1, Qiong GAO1, Chengzhu ZI1, Meifang DUAN1
Affiliations
  • 1 Yunnan Earthquake Agency, Kunming 650224, China
出版时间: 2026-04-15 doi: 10.14075/j.jgg.2025.06.194
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收集2013-2024年云南小滇西地区M≥3.0地震震源机制解, 采用叠加应力场方法反演区域构造应力及M≥5.0地震前后震源机制一致性时空演化特征。结果表明, 研究区震源机制以走滑型为主, 正断型为辅, P轴、T轴倾伏角较小, 断层面多为高倾角; 小滇西地区应力类型为走滑型, 压应力方位以NE-NNE向为主, 一致性较好, 张应力以SEE向为优势方向, 压应力和张应力倾伏角较小且接近水平, 研究区以水平应力为主, 受NE-NNE向水平挤压和SEE向拉张作用; 小滇西地区M≥5.0地震发生在应力张量方差低值区或其边缘, 且震前经历了应力张量方差由峰值趋势下降的过程, 研究区应力张量方差持续下降或处于较低水平可能与中强地震危险性密切相关, 但二者关系不唯一, 可联合低b值等其他参数综合跟踪分析。本文研究结果可为研究区地震震源特征分析、构造应力研究及震情跟踪提供参考。

小滇西地区  /  震源机制  /  构造应力  /  震源机制一致性

We collect the focal mechanisms of M≥3.0 earthquakes in western Yunnan region from 2013 to 2024, use the superimposed stress field method to carry out regional tectonic stress inversion, and investigate the spatiotemporal evolution characteristics of focal mechanism consistency before and after M≥5.0 earthquakes. The results show that the focal mechanism in the study area is mainly slip-type, supplemented by normal fault type. The plunge angles of P-axis and T-axis are small, and the fault plane is mostly high dipping. The stress type in the study area is slip-type. The compressive stress is mainly in the direction of NE to NNE, with a better consistency, while the tension stress is dominant in the direction of SEE. The dip angles of compressive stress and tension stress are small and close to the horizontal in western Yunnan. The study area is mainly characterized by horizontal stress and is subject to horizontal compression in the NE to NNE direction and tension in the SEE direction. The M≥5.0 earthquakes occurred in areas with low variance of stress tensor or their edges, and the stress tensor variance experienced the process of decreasing from the peak before the earthquake. The continuous decrease or low level of stress tensor variance may be closely related to the risk of moderate earthquakes in the western Yunnan, but the relationship between them is not unique, and can be comprehensively analyzed by combining with other parameters, such as the low b-value. The research findings provide a reference for analyzing seismic source characteristics, studying tectonic stress, and tracking seismic activity in the study area.

western Yunnan region  /  focal mechanism  /  tectonic stress  /  focal mechanism consistency
李见, 杨建文, 陈佳, 王军, 高琼, 字承柱, 段美芳. 小滇西地区震源机制及应力特征分析. 大地测量与地球动力学, 2026 , 46 (4) : 443 -450 . DOI: 10.14075/j.jgg.2025.06.194
Jian LI, Jianwen YANG, Jia CHEN, Jun WANG, Qiong GAO, Chengzhu ZI, Meifang DUAN. Focal Mechanisms and Stress Field Characteristics in Western Yunnan Region[J]. Journal of Geodesy and Geodynamics, 2026 , 46 (4) : 443 -450 . DOI: 10.14075/j.jgg.2025.06.194
云南地处青藏高原东南缘、印度板块与欧亚板块碰撞带东侧,受青藏高原东流物质推挤、华南地块NW-NNW向应力及印度板块向东经缅甸的侧向挤压力等多种力源作用,其中印度板块的侧向挤压力直接作用于云南西部地区,尤其是澜沧江断裂以西区域[1-5]。小滇西地区被界定为澜沧江断裂、南汀河断裂以西至国界以内区域[6],该区恰处于印度板块侧向挤压力较强的地带,多动力耦合作用致使小滇西地区构造变形及地震活动十分强烈。21世纪以来研究区地震趋于活跃,2013—2024年共发生M≥3.0地震116次,其中M≥5.0地震4组7次,分别为2014年盈江6.1级(包括5.6级前震及5.1级余震)、2015年沧源5.5级及昌宁5.1级、2021年盈江5.0级和2023年芒市5.0级地震。区内地质构造复杂,发育有NS向的怒江断裂、柯街断裂以及NE向的大盈江断裂、龙陵-瑞丽断裂、畹町断裂等主要断裂。
地震震源机制解是地震学研究的核心内容之一,包含地震矩震级、矩心深度、断层节面Ⅰ与节面Ⅱ参数及P、T轴方位与倾伏角等关键信息。基于震源机制解,可从震源层面深入了解地震破裂方式及发震断层的力学性质,系统分析小滇西地区地震震源机制特征,对探究该区地震孕育机制具有重要意义[7]。同时,地震震源机制解蕴含地球深部信息,大量中小地震震源机制解的优势结果可反映区域构造应力场特征[8-12]。目前基于云南及周边应力场反演结果的研究主要聚焦于云南及其邻区较大区域的震源机制和应力场,针对小滇西局部地区的研究相对较少且震源机制资料选取时间相对较早,同时该区构造应力研究结果有所差别[12-13]。此外,部分学者通过震源机制解反演小滇西地区中强震震源机制一致性参数时空演化特征,但主要关注小滇西地区2014年盈江6.1级地震,缺乏其余5.0~5.9级地震相关研究。鉴于此,本文收集云南小滇西地区M≥3.0地震震源机制解,系统分析区域地震震源机制整体特征,采用叠加应力场反演方法探究构造应力特征及M≥5.0地震前后震源机制一致性参数的时空演化,剖析区域构造应力变化与中强地震的内在联系。
本文收集2013—2024年小滇西地区共计116次M≥3.0地震的震源机制数据,数据来源于中国地震科学实验场大理中心(下关地震监测中心站)小孔径测震台网,该数据在云南地区震源机制相关研究中被广泛使用[4, 7, 9]。震源机制结果采用CAP方法计算得到, 该方法无需大量地震台站,且速度模型对反演结果影响较小,在震源机制研究中具有较高的可靠性[14-15]。反演前对波形进行重采样,采样间隔为0.08 s,去除仪器响应和坐标旋转,对所有数据进行去均值和去倾处理,去除仪器漂移影响,同时分别对Pnl波、面波进行带通滤波。反演的断层面参数、搜索步长、深度步长等参数及地震台站分布参考李见等[16]的设置,使用的速度模型为人工地震测深研究得到的一维速度模型[9, 15](表 1)。震源机制解分类参照Zoback[17]的分类标准,并结合陈佳等[7]的研究成果,根据P、T、B轴倾角范围划分为6类:正断型、正走滑型、走滑型、逆走滑型、逆断型和不确定型,具体分类标准及研究区震源机制统计结果见表 2。
基于收集的震源机制解,绘制小滇西地区2013—2024年M≥3.0地震震源机制空间分布图(图 1),并开展分类统计分析(表 2)。结果表明,地震主要沿NE向的大盈江断裂、龙陵-瑞丽断裂、畹町断裂以及NS向的怒江断裂、柯街断裂分布,远离断裂区域地震分布较少或为地震空区(如大盈江断裂与龙陵-瑞丽断裂之间基本无M≥3.0地震),研究区地震活动可能主要受区域主体断裂控制。走滑型地震在研究区分布均匀且数量最多,约占64.0%;正断型与正走滑型约占16.3%,主要集中于龙陵-瑞丽断裂、畹町断裂交会处及柯街断裂、澜沧江断裂交会处附近,小滇西地区紧邻云南滇西北地区,延续了滇西北地区的拉张型应力特征[7];逆断型与逆走滑型约占9.5%,主要集中于研究区中西部,东部分布较少;不确定型震源机制解约占12.1%。研究区89%的地震震源深度集中在10 km以内,指示区域地震活动主要受控于浅表构造变形。研究区所有地震震源机制解节面Ⅰ、Ⅱ倾角均大于30°,其中节面Ⅰ、Ⅱ倾角大于60°的地震事件分别为84个和89个,分别约占总事件的72%和77%(图 2),表明小滇西地区大部分地震为倾角大于60°的高倾角地震,与云南地区多数断层接近垂直展布、破裂面较陡的特征相符,这种地质条件有利于形成走滑型地震[7],研究区震源机制解以走滑型为主且大部分为高倾角地震可能与区域断层破裂面较陡的地质条件密切相关。对小滇西地区地震震源机制解P、T轴倾伏角及方位进行统计分析,并绘制玫瑰图(图 3)。可以看出,小滇西地区地震震源机制解P轴优势方位为NE向至近NS向,与NE向的大盈江断裂、龙陵-瑞丽断裂以及NS向的柯街断裂展布方向一致,进一步印证了地震活动受区域主体断裂控制,T轴优势方位为NWW向至近EW向。P、T轴倾伏角小于30°的震源机制解分别为84个和86个,分别约占总事件的72%和74%;P、T轴倾伏角大于45°的震源机制解分别为19个和9个,分别约占总事件的16%和8%。由此可见,小滇西地区大部分地震震源机制解P、T轴倾伏角较小,区域地震震源应力作用以水平为主。
在云南地区构造应力场反演方面,采用的方法主要可归纳为两类:一类是阻尼参数法[2, 5, 12],通过引入适宜的阻尼因子,可较好地呈现区域应力场宏观特征;另一类是线性叠加反演法[4, 18-19],该方法既可反演区域整体应力特征,又能揭示震源机制一致性时空演化,进而分析其与M≥5.0中强地震的关系,探讨地震前后区域应力变化。鉴于小滇西地区地震活动频繁,需在获取整体构造应力特征的同时,进一步分析震源机制一致性时空演化与中强震活动的关系,这对震情跟踪具有重要意义,故本文选择线性叠加反演法开展研究。该方法包含2种实施路径:一是区域最优应力张量反演,可获得表征区域整体特征的3个主应力(压应力轴、张应力轴和中间应力轴)方位及应力形变因子等关键参数,反映区域应力场整体特征[4];二是分网格应力张量方差反演,通过将研究区按特定经纬度划分网格,利用各网格点周边一定数量震源机制解进行反演,进而揭示区域应力张量方差及最大主压应力的空间分布规律。其中,应力张量方差作为衡量震源机制一致性的关键指标,其数值大小可直观反映震源区应力场与区域构造应力场的一致性程度,方差越小,表明区域震源机制越一致,应力场越均匀;方差越大,说明区域震源机制一致性越差,应力场时空演化越不均匀[4, 19]。线性叠加反演法由Michael等[20]率先提出,经Wiemer[21]完善,目前已集成至MATLAB软件的ZMAP软件包中。
将收集的小滇西地区116次M≥3.0地震震源机制解采用线性叠加反演法进行最优应力张量反演,表 3为反演得到的最大主应力S1、中间主应力S2、最小主应力S3、应力形因子φ及区域整体应力类型,95%置信区间下的主应力轴及其下半球等面积投影见图 4。由表 3和图 4可知,研究区应力体系以走滑型为主。根据走滑应力体系的力学特征,该体系可产生正断型、正走滑型、逆断型、逆走滑型和走滑型多种震源机制[22],与研究区震源机制解以走滑型为主,含部分正断型及少量逆断型的特征吻合。在走滑型应力背景下,小滇西地区震源机制伴有较多正断型及正走滑型震源机制,可能与以下因素有关:研究区受印度板块NE向挤压和缅甸弧NE向俯冲作用,地块向南逃逸[23],逃逸过程可能存在局部拉张;红河断裂东西两侧地壳厚度(东侧高于西侧)及速度结构存在差异,研究区位于红河断裂西侧,其东北部正断型震源机制接近红河断裂,构造差异可能引起局部应力扰动,造成局部拉张[24];小滇西地区延续了滇西北地区的拉张型应力特征[7]。此外,腾冲火山位于研究区内,火山区附近张应力可能也是正断型震源机制解较多的因素之一[12]。最大主应力S1方位角为20.3°(NNE向),最小主应力S3方位角为110°(SEE向);最大主应力S1倾伏角为2.2°,最小主应力S3倾伏角为6.4°,压应力和张应力倾伏角较小且接近水平,小滇西地区以水平应力为主。应力形因子为0.62,3个主应力轴呈明显簇状分布,约束较好,说明反演结果可靠。由此推断,小滇西地区受NNE向水平挤压和SEE向拉张作用,构造活动主要受走滑断层控制,与区域走滑型震源机制解占比较高的结果一致。为进一步分析研究区压应力空间变化,将小滇西地区按0.1°×0.1°进行网格化处理,对于每个网格节点,选取周围至少4个地震震源机制解开展反演,得到研究区压应力方位空间分布(图 5)。结果表明,小滇西地区压应力方位以NE-NNE向为主,整体一致性较好。西部柯街断裂东西两侧区域(如柯街断裂、南汀河断裂及澜沧江断裂围合区域)震源机制数量不足,反演结果可靠性较低,图 5已剔除相应结果,后续对该区域的研究可能还需使用其他方法获得更多小震级震源机制解进行分析。综合判断,小滇西地区压应力空间分布以NE-NNE向为优势方位,这与研究区最优应力张量反演结果相互印证,进一步验证了本文结论的可靠性。此外,钱晓东等[1]、孙业君等[2]及盛书中等[5]的研究结果显示,云南地区应力场方向在空间上具有连续性,由北向南最大水平压应力方向呈顺时针旋转特征,在NE向大盈江断裂、龙陵-瑞丽断裂、畹町断裂以及NS向怒江断裂、柯街断裂交会的小滇西地区,最大水平压应力逐渐转变为NE-NNE向,研究区自东北向西南,压应力方位呈NE-NNE向变化趋势,与前人研究结果一致。
将小滇西地区按0.1°×0.1°进行网格化,选择每个网格节点周围(0.1°以内)至少4个地震震源机制解进行反演,获得研究区压应力方位空间分布,同时进一步反演得到区域应力张量方差空间分布,结果如图 6所示。从空间分布来看,小滇西地区应力张量方差呈现出显著的空间分异性。大盈江断裂两侧及其与怒江断裂交会区附近,应力张量方差普遍小于0.05,形成大范围的低值聚集区,该区震源机制高度一致,应力场较为均匀,区域应力积累,应力水平较高,可能存在潜在地震危险性,有必要加强该区破坏性地震危险性研究。研究区西南部应力张量方差高达0.35,表明该区震源机制一致性较差,应力场紊乱不均匀,与该区存在多种类型震源机制、应力变化复杂的特征对应。南汀河断裂、柯街断裂及澜沧江断裂附近,应力张量方差分布较为零散,高低值交错。刘自凤等[19]对2014年盈江6.1级地震震区应力张量空间分布进行反演,尽管其使用的网格化窗口等参数与本文存在差异,但结果接近,均显示震区附近存在集中的方差低值, 进一步验证了本文反演结果的可靠性。
为揭示小滇西地区应力张量方差与中强地震活动之间的内在联系,本文将2013—2024年小滇西地区5.0级及以上地震事件投影至应力张量空间分布图进行耦合分析。结果表明,除2023年芒市5.0级地震发生于应力张量方差低值区边缘(方差值约0.1)外,其余5.0级及以上地震均发生在应力张量方差低值区,应力张量方差小于0.1。以往研究[4, 19, 25]表明,大多中强地震发生在应力张量方差低值区及其边缘,与本文研究结果基本一致。但本文研究结果显示部分应力张量方差低值区(如大盈江断裂两侧应力张量方差大范围低值区)并无5.0级及以上地震发生,表明二者关系并非简单的线性对应,仍需结合更多震例数据进行深入研究。中强震发生前区域应力变化是一个复杂的过程。为进一步分析小滇西地区5.0级及以上地震发生前后区域应力变化,将小滇西地区震源机制解按10个地震事件为窗长,4个地震事件为步长进行滑动反演计算,得到小滇西地区应力张量方差随时间的动态演化曲线(图 7)。可以看出,小滇西地区应力张量方差波动明显,存在3次下降过程,具体来看:2013年应力张量方差自峰值首次下降至谷值后回升,2014年盈江6.1级地震(研究期间最大震级地震)发生于谷值附近,其方差值低于0.05,为5次中强震的最低值,震后应力张量方差持续波动上升;2015年沧源5.5级、昌宁5.1级地震则发生在应力张量方差波动上升阶段,方差值小于0.1;2018年应力张量方差升至峰值后开始第2轮下降,2021年盈江5.0级地震发生于应力张量方差降至谷值并转折回升阶段,应力张量方差也在0.1以下,该时段仅发生此次中强震,无其他5.0级或更大震级地震,地震发生时应力张量方差变化相对平缓连续;2023年应力张量方差开启第3轮下降,2023年芒市5.0级地震发生在下降阶段。从整体上看,5次中强震均未发生于应力张量方差高值阶段,而是集中出现在应力张量方差小于0.15的低值区间,震前普遍经历了应力张量方差值由高值向谷值趋势下降的衰减过程,震后逐渐回升。本文研究结果与樊文杰等[4]、刘自凤等[19]的结论基本一致,云南部分中强震研究也表现出类似的变化特征。
综合前文分析,小滇西地区应力类型为走滑型,以水平应力为主,受NE-NNE向水平挤压与SEE向拉张作用,该结果与孙业君等[2]、盛书中等[5]及田建慧[12]使用阻尼参数反演的结果基本一致;研究区M≥5.0地震均发生在应力张量方差低值区或其边缘,且震前经历了应力张量方差由峰值趋势下降的过程。
小滇西地区位于印度板块与欧亚板块碰撞的边界带,由于受印度板块NE向侧向挤压影响,块体受水平应力场控制[12],最大压应力方向由滇西北地区的NNW向逐渐转变为小滇西地区的NE-NNE向。青藏高原东南缘在上地壳的运动变形过程主要受大规模走滑断层控制[26],本文揭示的走滑型应力场为区域尺度的平均应力状态,田建慧[12]研究认为局部地区(腾冲火山区)还存在正断型应力场,这可能与深部岩浆活动引发的垂向拉张作用相关;盛书中等[5]和庄文泉等[27]的最新研究结果表明,研究区应力类型为走滑型,与本文结论一致。推测在板块碰撞的大尺度动力学背景下,现今小滇西地区NE-NNE向的水平挤压和SEE向的拉张作用对地震破裂过程的控制作用可能要强于局部岩浆活动[5]。需要指出的是,本文应力场反演结果仅反映区域整体特征,针对局部构造单元(如火山活动区、断裂交会带)的应力状态仍需进一步精细研究。
小滇西地区5次中强地震均发生于应力张量方差低值区及其边缘,震前普遍经历了应力张量方差由峰值趋势下降的过程,显然应力张量方差的时空变化特征对区域中强地震危险性分析具有一定指示意义。不同震级事件对应力张量方差低值的响应存在差异:2014年盈江6.1级地震发生于方差最小值附近,而其余4次较小震级地震多发生于方差下降或回升阶段,暗示震级大小与应力积累程度存在潜在关联,高震级事件可能需要更充分的应力积累过程,对应更低的应力张量方差值。虽然4次地震前应力张量方差低值不如盈江6.1级地震显著,但应力张量方差处于低值时,震源机制趋于一致,对5.0~5.9级地震的发生也具有一定指示意义。尽管多数中强震与应力张量方差低值区存在空间耦合关系,但研究区仍有部分长期稳定的方差低值区未发生M≥5.0地震,表明应力张量方差低值与地震发生的关系比较复杂,需结合更多指标进行综合研判。王光明等[6]提出低b值是小滇西地区地震的一个异常指标,发现2014年盈江6.1级地震既处于应力张量方差低值区,同时伴随震前低b值异常,显然小滇西地区多参数联合分析在震情跟踪方面具有一定有效性;高雅婧等[28]认为青藏高原东南部地震震源区及周边区域b值的降低-升高-降低揭示了区域应力的累积-释放-累积的演化过程,显示震源机制一致性和b值对区域应力的反映存在内在联系;杨芬[29]针对漾濞6.4级地震,利用数学模型对流体地球化学各单项异常指标进行处理,建立综合判断阈值。因此在小滇西地区震情监测中,可结合应力张量方差、b值等多参数综合分析,建立多指标耦合的地震危险性评价模型,以提升区域地震震情分析能力。
本文基于2013—2024年云南小滇西地区M≥3.0地震震源机制解,分析研究区震源机制整体特征;采用ZMAP软件包集成的线性叠加应力场方法反演区域构造应力场,并探究M≥5.0地震前后震源机制一致性时空演化特征,得到以下结论:
1) 小滇西地区震源机制解以走滑型为主,断层面多为高倾角,P、T轴倾伏角较小,呈近水平特征,反映区域应力以水平为主。
2) 小滇西地区应力类型为走滑型,压应力方位以NE-NNE向为主且一致性较好,张应力以SEE向为优势方向,压应力和张应力倾伏角较小且接近水平,研究区受NE-NNE向水平挤压和SEE向拉张作用。
3) 小滇西地区M≥5.0地震发生在应力张量方差低值区或其边缘,且震前经历了应力张量方差由峰值趋势下降的过程,小滇西地区应力张量方差持续下降或处于较低水平对区域M≥5.0地震具有一定指示意义,但二者关系不唯一,可联合低b值等其他指标进行综合跟踪分析。
  • 中国地震局震情跟踪课题(CEA-ZQGZ-202501034)
  • 云南省地震局科技创新团队项目(CXTD202411)
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doi: 10.14075/j.jgg.2025.06.194
  • 接收时间:2025-06-09
  • 首发时间:2026-10-29
  • 出版时间:2026-04-15
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  • 收稿日期:2025-06-09
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中国地震局震情跟踪课题(CEA-ZQGZ-202501034)
云南省地震局科技创新团队项目(CXTD202411)
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    1 云南省地震局, 昆明, 650224

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杨建文, 高级工程师, 主要从事地震学研究, E-mail:
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
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红菇属 Russula 17 8.13
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