Article(id=1322916818502955382, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322916705915249052, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2025.10.339, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1760112000000, receivedDateStr=2025-10-11, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793337548136, onlineDateStr=2026-10-30, pubDate=1784044800000, pubDateStr=2026-07-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793337548136, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793337548136, creator=13701087609, updateTime=1793337548136, updator=13701087609, issue=Issue{id=1322916705915249052, tenantId=1146029695717560320, journalId=1281212831689347082, year='2026', volume='46', issue='7', pageStart='790', pageEnd='912', issueExtLink='null', onlineDate='null', pubDate='1784044800000', pubDateStr='2026-07-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793337521294, creator='13701087609', updateTime=1793337521294, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=859, endPage=867, ext={EN=ArticleExt(id=1322916818658144631, articleId=1322916818502955382, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Evolution of Stress in the Source Region before and after the 2021 Yangbi Earthquake in Yunnan, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Based on seismic waveform data, earthquake catalogs, and historical focal mechanism solution data, we systematically analyze the stress evolution characteristics of the seismic source area of the 2021 Yangbi, Yunnan MS6.4 earthquake from the perspective of three types of stress parameters, namely apparent stress, b-value, and tectonic stress field. The results indicate that: 1) The apparent stress continuously increased before the main shock and decreased significantly after the shock, reflecting the physical process of pre-seismic stress accumulation and co-seismic stress release. 2) The b-value decreased obviously prior to the main shock, indicating a sustained enhancement of regional tectonic stress. 3) Results from the stress field inversion show that the main shock induced perturbations in the stress field of seismic source region, though these were not significant. Comprehensive analysis demonstrates that the variations in apparent stress and b-value effectively reveal the dynamic stress evolution characteristics of the seismic source area during the gestation and occurrence of the Yangbi earthquake sequence, which provides important insights for understanding the mechanisms of fault activity and stress evolution.

, authors=Lu CHEN1, Shuzhong SHENG1, Yan'e LI2, Suxiang ZHANG3, Kunpeng GE1, Ganjiao WANG4, Xiaojuan ZHANG5, Qianru WANG1, authorsList=Lu CHEN, Shuzhong SHENG, Yan'e LI, Suxiang ZHANG, Kunpeng GE, Ganjiao WANG, Xiaojuan ZHANG, Qianru WANG, authorCompany=null, correspAuthors=null, 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=1322916820524609928, articleId=1322916818502955382, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=2021年云南漾濞地震前后震源区应力演化研究, columnId=1281933709121138897, journalTitle=大地测量与地球动力学, columnName=地球动力学, runingTitle=null, highlight=null, articleAbstract=

基于地震波形数据、地震目录及历史地震震源机制解, 从视应力、b值和构造应力场三类应力参数的角度系统分析2021年云南漾濞MS6.4地震震源区的应力演化特征。结果显示: 1)主震前视应力持续升高, 震后显著下降, 反映了震前应力积累与同震释放的物理过程; 2)b值在主震前明显降低, 指示区域构造应力持续增强; 3)应力场研究结果表明, 主震对震源区应力场产生扰动, 但并不显著。综合分析表明, 视应力与b值变化可有效揭示漾濞地震序列孕育至发生过程中震源区应力的动态演化特征, 为理解断层活动与应力演化机制提供重要参考。

, authors=陈璐1, 盛书中1, 李艳娥2, 张苏祥3, 葛坤朋1, 王甘娇4, 张小娟5, 王倩茹1, authorsList=陈璐, 盛书中, 李艳娥, 张苏祥, 葛坤朋, 王甘娇, 张小娟, 王倩茹, authorCompany=null, correspAuthors=null, authorNote=

陈璐, 硕士生, 主要研究方向为构造应力场及视应力, E-mail:

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陈璐, 硕士生, 主要研究方向为构造应力场及视应力, E-mail:

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陈璐, 硕士生, 主要研究方向为构造应力场及视应力, E-mail:

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蓝色区域为选定5%的AIC最佳模型b值结果的平均绝对偏差(MAD), 可反映b值估计的不确定性, 灰色虚线代表平均b值1.16

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震源机制解图中红色十字为参与反演的台站;波形下方第1行数字为理论波形相对实际观测波形的移动时间(单位s),正值表示理论波形比观测波形快;第2行数字为理论与观测波形的互相关系数(%);波形左侧的大写字母为台网名和台站名;下方数字分别表示震中距(单位km)和相对偏移时间(单位s)

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Focal mechanism solutions of the Yangbi earthquake sequence with M≥3.0

, figureFileSmall=null, figureFileBig=null, tableContent=
序号 发震时刻 震中位置 矩心深度/km 震级 节面Ⅰ 节面Ⅱ
经度/(°) 纬度/(°) MS MW 走向/(°) 倾角/(°) 滑动角/(°) 走向/(°) 倾角/(°) 滑动角/(°)
1 2021-05-18 18:49:30 99.94 25.64 6 3.2 3.8 43 77 -8 135 82 -167
2 2021-05-18 20:56:46 99.93 25.63 7.5 3.6 3.7 43 71 2 312 88 161
3 2021-05-18 21:39:35 99.92 25.64 7.5 4.2 4.4 40 78 8 308 82 168
4 2021-05-19 03:27:56 99.92 25.63 9 3.1 3.9 134 86 -2 224 88 -176
5 2021-05-19 20:05:56 99.91 25.65 6 4.4 4.7 48 84 15 316 75 174
6 2021-05-19 21:13:07 99.9 25.67 6 3.2 4.0 46 84 4 316 86 174
7 2021-05-20 01:58:59 99.9 25.66 5 3.2 4.0 51 86 -8 142 82 -176
8 2021-05-21 20:56:02 99.91 25.61 5 4.2 4.4 32 65 -36 139 58 -150
9 2021-05-21 21:21:25 99.92 25.65 6 5.6 5.3 40 78 19 306 71 167
10 2021-05-21 21:21:57 99.96 25.63 5.4 4.8 4.6 208 67 -33 312 60 -153
11 2021-05-21 21:48:35 99.88 25.7 6.1 6.4 6.1 44 80 -13 136 77 -170
12 2021-05-21 21:53:48 99.98 25.6 4.7 4.1 3.9 239 78 7 148 83 168
13 2021-05-21 21:55:29 99.89 25.67 5 5.0 4.8 241 72 3 150 87 162
14 2021-05-21 21:56:38 99.95 25.62 6.5 4.9 4.6 240 64 -12 335 79 -153
15 2021-05-21 22:03:36 99.96 25.58 10 3.9 3.7 221 65 30 117 63 152
16 2021-05-21 22:15:16 99.98 25.59 7.4 4.0 4.3 230 72 6 138 84 162
17 2021-05-21 22:31:10 99.97 25.61 9.2 5.2 5.1 39 74 -40 142 52 -159
18 2021-05-21 22:59:37 99.94 25.63 8 3.2 4.2 203 73 11 110 79 163
19 2021-05-21 23:08:57 99.98 25.6 9 3.5 4.0 122 80 166 214 76 10
20 2021-05-21 23:13:53 99.95 25.62 5.3 3.8 4.0 211 73 -16 306 75 -162
21 2021-05-21 23:18:09 99.99 25.6 9 3.4 3.9 133 71 -163 37 74 -20
22 2021-05-21 23:23:34 99.98 25.59 6.3 4.5 4.0 218 82 9 127 81 172
23 2021-05-22 00:51:41 99.88 25.61 6.2 4.0 4.3 32 81 -12 124 78 -171
24 2021-05-22 00:53:31 99.91 25.63 7 3.2 4.0 315 76 -116 199 29 -30
25 2021-05-22 00:56:08 99.9 25.62 6 3.8 3.9 332 61 -100 172 31 -73
26 2021-05-22 01:36:06 99.95 25.62 7.4 4.1 4.0 21 90 -7 111 83 -180
27 2021-05-22 01:50:18 99.96 25.61 6 3.3 3.8 314 79 -174 223 84 -11
28 2021-05-22 08:36:46 99.9 25.68 5 3.4 3.9 122 64 -138 10 53 -33
29 2021-05-22 09:48:01 99.89 25.7 6.9 4.0 4.3 43 85 -8 134 82 -175
30 2021-05-22 17:24:16 99.91 25.66 4 3.9 4.0 133 75 -172 41 82 -15
31 2021-05-22 20:14:36 99.92 25.6 5.8 4.4 4.8 39 73 -26 137 65 -161
32 2021-05-22 22:30:05 99.94 25.59 8 3.2 3.8 309 69 -168 215 79 -21
33 2021-05-24 08:43:09 100.01 25.57 6 3.1 3.6 146 70 171 239 82 20
34 2021-05-27 19:52:46 99.92 25.76 6.3 4.1 4.3 14 73 -11 107 79 -163
35 2021-05-27 23:03:57 99.88 25.69 9 3.4 3.9 46 58 -15 144 77 -147
36 2021-05-28 20:43:18 99.92 25.54 11 3.5 4.1 105 49 -40 224 61 -131
37 2021-06-05 06:12:22 99.98 25.59 8 3.4 4.1 124 76 4 33 86 166
38 2021-06-29 06:41:28 99.99 25.73 10 3.6 3.5 294 78 -14 27 76 -168
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漾濞地震序列3.0以上事件的震源机制解

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序号 发震时刻 震中位置 矩心深度/km 震级 节面Ⅰ 节面Ⅱ
经度/(°) 纬度/(°) MS MW 走向/(°) 倾角/(°) 滑动角/(°) 走向/(°) 倾角/(°) 滑动角/(°)
1 2021-05-18 18:49:30 99.94 25.64 6 3.2 3.8 43 77 -8 135 82 -167
2 2021-05-18 20:56:46 99.93 25.63 7.5 3.6 3.7 43 71 2 312 88 161
3 2021-05-18 21:39:35 99.92 25.64 7.5 4.2 4.4 40 78 8 308 82 168
4 2021-05-19 03:27:56 99.92 25.63 9 3.1 3.9 134 86 -2 224 88 -176
5 2021-05-19 20:05:56 99.91 25.65 6 4.4 4.7 48 84 15 316 75 174
6 2021-05-19 21:13:07 99.9 25.67 6 3.2 4.0 46 84 4 316 86 174
7 2021-05-20 01:58:59 99.9 25.66 5 3.2 4.0 51 86 -8 142 82 -176
8 2021-05-21 20:56:02 99.91 25.61 5 4.2 4.4 32 65 -36 139 58 -150
9 2021-05-21 21:21:25 99.92 25.65 6 5.6 5.3 40 78 19 306 71 167
10 2021-05-21 21:21:57 99.96 25.63 5.4 4.8 4.6 208 67 -33 312 60 -153
11 2021-05-21 21:48:35 99.88 25.7 6.1 6.4 6.1 44 80 -13 136 77 -170
12 2021-05-21 21:53:48 99.98 25.6 4.7 4.1 3.9 239 78 7 148 83 168
13 2021-05-21 21:55:29 99.89 25.67 5 5.0 4.8 241 72 3 150 87 162
14 2021-05-21 21:56:38 99.95 25.62 6.5 4.9 4.6 240 64 -12 335 79 -153
15 2021-05-21 22:03:36 99.96 25.58 10 3.9 3.7 221 65 30 117 63 152
16 2021-05-21 22:15:16 99.98 25.59 7.4 4.0 4.3 230 72 6 138 84 162
17 2021-05-21 22:31:10 99.97 25.61 9.2 5.2 5.1 39 74 -40 142 52 -159
18 2021-05-21 22:59:37 99.94 25.63 8 3.2 4.2 203 73 11 110 79 163
19 2021-05-21 23:08:57 99.98 25.6 9 3.5 4.0 122 80 166 214 76 10
20 2021-05-21 23:13:53 99.95 25.62 5.3 3.8 4.0 211 73 -16 306 75 -162
21 2021-05-21 23:18:09 99.99 25.6 9 3.4 3.9 133 71 -163 37 74 -20
22 2021-05-21 23:23:34 99.98 25.59 6.3 4.5 4.0 218 82 9 127 81 172
23 2021-05-22 00:51:41 99.88 25.61 6.2 4.0 4.3 32 81 -12 124 78 -171
24 2021-05-22 00:53:31 99.91 25.63 7 3.2 4.0 315 76 -116 199 29 -30
25 2021-05-22 00:56:08 99.9 25.62 6 3.8 3.9 332 61 -100 172 31 -73
26 2021-05-22 01:36:06 99.95 25.62 7.4 4.1 4.0 21 90 -7 111 83 -180
27 2021-05-22 01:50:18 99.96 25.61 6 3.3 3.8 314 79 -174 223 84 -11
28 2021-05-22 08:36:46 99.9 25.68 5 3.4 3.9 122 64 -138 10 53 -33
29 2021-05-22 09:48:01 99.89 25.7 6.9 4.0 4.3 43 85 -8 134 82 -175
30 2021-05-22 17:24:16 99.91 25.66 4 3.9 4.0 133 75 -172 41 82 -15
31 2021-05-22 20:14:36 99.92 25.6 5.8 4.4 4.8 39 73 -26 137 65 -161
32 2021-05-22 22:30:05 99.94 25.59 8 3.2 3.8 309 69 -168 215 79 -21
33 2021-05-24 08:43:09 100.01 25.57 6 3.1 3.6 146 70 171 239 82 20
34 2021-05-27 19:52:46 99.92 25.76 6.3 4.1 4.3 14 73 -11 107 79 -163
35 2021-05-27 23:03:57 99.88 25.69 9 3.4 3.9 46 58 -15 144 77 -147
36 2021-05-28 20:43:18 99.92 25.54 11 3.5 4.1 105 49 -40 224 61 -131
37 2021-06-05 06:12:22 99.98 25.59 8 3.4 4.1 124 76 4 33 86 166
38 2021-06-29 06:41:28 99.99 25.73 10 3.6 3.5 294 78 -14 27 76 -168
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Statistics of the minimum 3D rotation angles between the focal mechanism solutions obtained in this study and other researches

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序号 时间 震级MS 走向/(°) 倾角/(°) 滑动角/(°) 来源 与本文结果的最小空间旋转角/(°)
1 2021-05-18 21:39:35 4.2 41 78 8 龙锋等[2] 1
40 78 8 段梦乔等[3] 0.3
41 75 11 王月等[20] 4.2
41 54 4 梁姗姗等[22] 24.4
41 71 5 王莹等[23] 7.9
40 70 10 赵博等[24] 8.2
42 75 8 樊文杰[25] 3.6
41 70 14 张珂等[26] 9.9
41 74 10 Tian等[27] 4.5
2 2021-05-21 21:48:35 6.4 138 82 -161 中国地震台网中心 9.8
135 75 -168 龙锋等[2] 3.3
136 77 -170 段梦乔等[3] 0.4
39 75 -16 李见等[4] 5.8
135 82 -165 USGS 7.0
315 86 168 GCMT 17.0
317 89 -177 ISC 19.2
138 75 -168 王月等[20] 3.1
45 80 5 梁姗姗等[22] 17.9
135 80 176 王莹等[23] 14.3
143 80 -165 赵博等[24] 8.0
44 74 -11 樊文杰[25] 6.3
137 79 -163 张珂等[26] 6.9
137 83 -163 Tian等[27] 8.9
137 76 -168 雷兴林等[28] 2.0
3 2021-05-21 22:31:10 5.2 146 48 -161 龙锋等[2] 6.4
39 74 -40 段梦乔等[3] 0.5
43 46 -26 USGS 30.6
40 71 -46 王月等[20] 7.0
42 74 -44 梁姗姗等[22] 5.6
47 85 -22 王莹等[23] 21.3
45 75 -45 赵博等[24] 8.8
42 73 -48 樊文杰[25] 9.4
41 70 -41 Tian等[27] 4.7
43 72 -43 雷兴林等[28] 6.0
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本文研究所得震源机制解与其他研究结果间最小空间旋转角统计

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序号 时间 震级MS 走向/(°) 倾角/(°) 滑动角/(°) 来源 与本文结果的最小空间旋转角/(°)
1 2021-05-18 21:39:35 4.2 41 78 8 龙锋等[2] 1
40 78 8 段梦乔等[3] 0.3
41 75 11 王月等[20] 4.2
41 54 4 梁姗姗等[22] 24.4
41 71 5 王莹等[23] 7.9
40 70 10 赵博等[24] 8.2
42 75 8 樊文杰[25] 3.6
41 70 14 张珂等[26] 9.9
41 74 10 Tian等[27] 4.5
2 2021-05-21 21:48:35 6.4 138 82 -161 中国地震台网中心 9.8
135 75 -168 龙锋等[2] 3.3
136 77 -170 段梦乔等[3] 0.4
39 75 -16 李见等[4] 5.8
135 82 -165 USGS 7.0
315 86 168 GCMT 17.0
317 89 -177 ISC 19.2
138 75 -168 王月等[20] 3.1
45 80 5 梁姗姗等[22] 17.9
135 80 176 王莹等[23] 14.3
143 80 -165 赵博等[24] 8.0
44 74 -11 樊文杰[25] 6.3
137 79 -163 张珂等[26] 6.9
137 83 -163 Tian等[27] 8.9
137 76 -168 雷兴林等[28] 2.0
3 2021-05-21 22:31:10 5.2 146 48 -161 龙锋等[2] 6.4
39 74 -40 段梦乔等[3] 0.5
43 46 -26 USGS 30.6
40 71 -46 王月等[20] 7.0
42 74 -44 梁姗姗等[22] 5.6
47 85 -22 王莹等[23] 21.3
45 75 -45 赵博等[24] 8.8
42 73 -48 樊文杰[25] 9.4
41 70 -41 Tian等[27] 4.7
43 72 -43 雷兴林等[28] 6.0
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Statistics of focal mechanism solution types in the seismic source region

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类型 正断层地震数量/占比 正走滑地震数量/占比 走滑地震数量/占比 逆走滑地震数量/占比 逆断层地震数量/占比
前震 4/20.0% 2/10.0% 13/65.0% 0 1/5.0%
余震区1 2/11.1% 0 11/61.1% 3/16.7% 2/11.1%
余震区2 1/6.2% 2/12.5% 10/62.5% 1/6.3% 2/12.5%
余震区3 3/7.8% 5/12.8% 27/69.2% 2/5.1% 2/5.1%
全部余震 6/8.2% 7/9.6% 48/65.8% 6/8.2% 6/8.2%
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震源区震源机制解类型统计

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类型 正断层地震数量/占比 正走滑地震数量/占比 走滑地震数量/占比 逆走滑地震数量/占比 逆断层地震数量/占比
前震 4/20.0% 2/10.0% 13/65.0% 0 1/5.0%
余震区1 2/11.1% 0 11/61.1% 3/16.7% 2/11.1%
余震区2 1/6.2% 2/12.5% 10/62.5% 1/6.3% 2/12.5%
余震区3 3/7.8% 5/12.8% 27/69.2% 2/5.1% 2/5.1%
全部余震 6/8.2% 7/9.6% 48/65.8% 6/8.2% 6/8.2%
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Axial parameters of the partitioned stress tensor and corresponding stress field types

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区号 主压轴 中间轴 主张轴 R 应力场类型
走向/(°) 倾伏角/(°) 走向/(°) 倾伏角/(°) 走向/(°) 倾伏角/(°)
前震 180° 42° 9° 47° 274° 5° 0.21 正走滑型
余震区1 172° 0° 82° 82° 262° 8° 0.78 走滑型
余震区2 339° 47° 178° 42° 79° 9° 0.32 正走滑型
余震区3 192° 19° 340° 68° 98° 11° 0.4 走滑型
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分区应力张量的各轴参数及应力场类型

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区号 主压轴 中间轴 主张轴 R 应力场类型
走向/(°) 倾伏角/(°) 走向/(°) 倾伏角/(°) 走向/(°) 倾伏角/(°)
前震 180° 42° 9° 47° 274° 5° 0.21 正走滑型
余震区1 172° 0° 82° 82° 262° 8° 0.78 走滑型
余震区2 339° 47° 178° 42° 79° 9° 0.32 正走滑型
余震区3 192° 19° 340° 68° 98° 11° 0.4 走滑型
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2021年云南漾濞地震前后震源区应力演化研究
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陈璐 1 , 盛书中 1 , 李艳娥 2 , 张苏祥 3 , 葛坤朋 1 , 王甘娇 4 , 张小娟 5 , 王倩茹 1
大地测量与地球动力学 | 地球动力学 2026,46(7): 859-867
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大地测量与地球动力学 |地球动力学 2026 , 46 (7) : 859 -867
2021年云南漾濞地震前后震源区应力演化研究
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陈璐1 , 盛书中1, 李艳娥2, 张苏祥3, 葛坤朋1, 王甘娇4, 张小娟5, 王倩茹1
作者信息
  • 1 东华理工大学地球物理与空间探测学院, 南昌, 330013
  • 2 中国地震局地球物理研究所, 北京, 100081
  • 3 上海市地震局, 上海, 200062
  • 4 江西省地震局, 南昌, 330026
  • 5 东华理工大学理学院, 南昌, 330013
作者简介:

陈璐, 硕士生, 主要研究方向为构造应力场及视应力, E-mail:

Evolution of Stress in the Source Region before and after the 2021 Yangbi Earthquake in Yunnan
Lu CHEN1 , Shuzhong SHENG1, Yan'e LI2, Suxiang ZHANG3, Kunpeng GE1, Ganjiao WANG4, Xiaojuan ZHANG5, Qianru WANG1
Affiliations
  • 1 School of Geophysics and Space Exploration, East China University of Technology, Nanchang 330013, China
  • 2 Institute of Geophysics, CEA, Beijing 100081, China
  • 3 Shanghai Earthquake Agency, Shanghai 200062, China
  • 4 Jiangxi Earthquake Agency, Nanchang 330026, China
  • 5 School of Science, East China University of Technology, Nanchang 330013, China
出版时间: 2026-07-15 doi: 10.14075/j.jgg.2025.10.339
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基于地震波形数据、地震目录及历史地震震源机制解, 从视应力、b值和构造应力场三类应力参数的角度系统分析2021年云南漾濞MS6.4地震震源区的应力演化特征。结果显示: 1)主震前视应力持续升高, 震后显著下降, 反映了震前应力积累与同震释放的物理过程; 2)b值在主震前明显降低, 指示区域构造应力持续增强; 3)应力场研究结果表明, 主震对震源区应力场产生扰动, 但并不显著。综合分析表明, 视应力与b值变化可有效揭示漾濞地震序列孕育至发生过程中震源区应力的动态演化特征, 为理解断层活动与应力演化机制提供重要参考。

2021年漾濞地震  /  震源机制解  /  视应力  /  b值  /  构造应力场

Based on seismic waveform data, earthquake catalogs, and historical focal mechanism solution data, we systematically analyze the stress evolution characteristics of the seismic source area of the 2021 Yangbi, Yunnan MS6.4 earthquake from the perspective of three types of stress parameters, namely apparent stress, b-value, and tectonic stress field. The results indicate that: 1) The apparent stress continuously increased before the main shock and decreased significantly after the shock, reflecting the physical process of pre-seismic stress accumulation and co-seismic stress release. 2) The b-value decreased obviously prior to the main shock, indicating a sustained enhancement of regional tectonic stress. 3) Results from the stress field inversion show that the main shock induced perturbations in the stress field of seismic source region, though these were not significant. Comprehensive analysis demonstrates that the variations in apparent stress and b-value effectively reveal the dynamic stress evolution characteristics of the seismic source area during the gestation and occurrence of the Yangbi earthquake sequence, which provides important insights for understanding the mechanisms of fault activity and stress evolution.

2021 Yangbi earthquake  /  focal mechanism solution  /  apparent stress  /  b-value  /  tectonic stress field
陈璐, 盛书中, 李艳娥, 张苏祥, 葛坤朋, 王甘娇, 张小娟, 王倩茹. 2021年云南漾濞地震前后震源区应力演化研究. 大地测量与地球动力学, 2026 , 46 (7) : 859 -867 . DOI: 10.14075/j.jgg.2025.10.339
Lu CHEN, Shuzhong SHENG, Yan'e LI, Suxiang ZHANG, Kunpeng GE, Ganjiao WANG, Xiaojuan ZHANG, Qianru WANG. Evolution of Stress in the Source Region before and after the 2021 Yangbi Earthquake in Yunnan[J]. Journal of Geodesy and Geodynamics, 2026 , 46 (7) : 859 -867 . DOI: 10.14075/j.jgg.2025.10.339
2021-05-21中国云南省漾濞县发生MS6.4地震。漾濞县城位于此次地震极震区内,震害相对较重,引起了社会和科学界的广泛关注。研究表明[1],该地震序列是典型的“前震-主震-余震”型序列,地震观测资料丰富,是开展震源区应力演化研究的理想震例。近年来,已有大量学者就本次地震序列开展了相关研究[2-6]。
在震源区应力研究方面,视应力、b值及构造应力场是3个重要的应力参数。视应力作为直接反映震源区应力水平的地震学参数[7],其时空变化能够有效揭示孕震过程中的应力积累与释放[8]。Li等[9]研究表明,漾濞地震震前视应力呈现持续缓慢上升的趋势,且存在显著异常增幅。b值长期以来被用于估计地下应力状态,通常随应力增加而降低。姜丛等[10]基于TbDD方法计算漾濞地震序列的b值,发现主震前b值处于低值,而主震发生后b值起伏明显,段梦乔等[3]的研究也得出类似结论。基于震源机制解反演构造应力场的方法被广泛应用于应力场研究[11-14],漾濞地震震源区构造应力场研究结果表明其受到NNW-SSE向近水平主压应力作用,应力场类型为走滑型[2, 12]。
现有研究从不同方面揭示了漾濞地震震源区的应力变化特征。然而,已有研究多关注单一参数,缺乏将视应力、b值与构造应力场相结合的综合性研究。因此,本文拟从视应力、b值及构造应力场3个方面综合探讨2021年漾濞地震震源区的应力演化,以期深化对其孕震过程及破裂机制的认识。
本文研究区为漾濞及周边区域(图 1),收集并整理2010—2021年区域内ML≥3.0的767次地震波形资料,同时收集2010—2021年ML≥0的83 301次地震数据。此外,选取震源区38次地震的波形资料进行震源机制解反演,收集余海琳等[14]的研究中59次M≥2.0除上述38次地震之外的地震震源机制解,时间范围为2021-05-18—06-06。
本文视应力计算方法参考陈学忠等[8]的研究;b值计算方法采用基于数据驱动的时间序列b值计算新方法(TbDD-AIC)[15];使用gCAP方法[16]进行震源机制解反演,其中地壳速度模型采用Han等[17]的研究结果(图 2)。构造应力场反演采用Vavry uk[18]的迭代反演方法,具体使用Li等[19]给出的程序。
基于前文所述的方法和数据,选取震源区1°×1°范围内204次地震事件进行视应力分析研究。考虑震级的可能影响[8],分别使用ML3.0~3.9和ML3.0~4.9地震事件,2个震级范围的地震数分别为163次和193次。采用滑动窗法计算平均视应力[9],窗长和步长分别为15和1,得到视应力随时间的变化曲线见图 3。
对于ML3.0~3.9地震事件(图 3(a)),可以看出,2012—2021年震源区视应力存在显著变化,虽然存在一定波动,但总体表现为逐渐升高的趋势,并在漾濞MS6.4地震前处于高值,说明震前震源区应力处于逐渐积累状态。对于ML3.0~4.9地震事件(图 3(c)),可以看出,视应力从2012年开始上升,然后在2014-08出现下降,2017年又开始逐渐上升,一直持续到漾濞MS6.4地震前,说明震前震源区应力总体处于积累状态。图 3(b)和3(d)分别为图 3(a)和3(c)中矩形区域部分的放大图,可以看出,震前视应力呈显著高值,主震发生后视应力下降。
选取2010—2021年以震中为中心1°×1°范围内的15 023次地震,计算得到研究区b值分布在0.64~1.45之间,平均值为1.16,属于正常范围内[20],反映本文结果具有可靠性。
2010-01—2012-01研究区b值在均值附近波动(图 4),约从2011-12开始有下降趋势,在2014-08达到低值,该时段附近研究区曾发生M4.7地震。2014-08之后,b值逐渐升高。约从2014-11起,b值恢复到均值以上,甚至明显高于前一阶段。漾濞地震前b值出现持续下降的情况,反映震前应力显著增强,震源区应力水平上升,该现象与其他研究结果类似[3]。在主震发生后,b值表现为缓慢上升,反映出震源区应力水平开始缓慢下降,这可能与余震活动有关。综上可知,b值的时变特征能够清晰反映震源区构造应力的积累-释放过程。
基于gCAP方法反演漾濞地震序列中3.0级以上地震的震源机制解(表 1)。主震震源机制解节面Ⅰ为走向44°、倾角80°和滑动角-13°;节面Ⅱ为走向136°、倾角77°和滑动角-170°;矩震级为MW6.1(图 5和6)。波形拟合结果表明,超过80%的台站记录的波形相关系数达到0.7以上,说明理论计算结果与实际观测结果具有较高的一致性,本文反演结果可靠。
为分析震源机制解结果的准确性,采用三维最小空间旋转角[21]定量描述不同震源机制解结果间的差异。将本文所得的3次中强地震震源机制解结果与其他学者或机构给出的结果进行比较,获得34组对比结果(表 2)。由表 1可知,地震间的最小空间旋转角最大值为30.6°,最小值为0°。最小空间旋转角大于30°的有1组结果,占3.0%;在15°~30°之间的有5组,占14.7%;小于15°的有28组,占82.3%。本文结果与GCMT、ISC、USGS、梁姗姗等[22]及王莹等[23]测定结果的三维空间旋转角差异稍大,其他结果均在15°范围内,说明本文所得结果与其他学者或机构所得结果基本一致,反映了本文的研究结果具有可靠性。
基于计算得到的数据与收集的历史地震震源机制解数据(图 7),采用万永革[29]提出的震源机制解分类方法对震源机制解进行分类(表 3),可以看出,前震震源机制解类型和余震的震源机制解类型存在差异,余震的正断型地震占比减少,同时出现了逆走滑型地震,这种差异可能说明主震发生后,震源区应力场受到扰动。
为对比地震前后应力场变化,参考震前空间分布,将余震分为3个区域进行应力场反演,结果详见表 4,其中余震区2和前震分布区域相同(图 7)。
为避免因空间差异产生的应力不均性影响,本文仅对比相同区域的应力场反演结果,即比较前震和余震区2的应力场结果。尽管地震前后该区域应力场类型都属于正走滑型,但震后的σ3走向相对于前震的σ3走向出现逆时针旋转;考虑到σ3轴的置信区间存在重叠部分,反映主震的发生对震源区应力场产生扰动,但这一扰动并不显著。该区域的应力场类型为正走滑型,表明该地区存在拉张性,这与雷兴林等[28]研究认为震源区存在拉张阶区的结果一致。
一般而言,较短的步长能够更细致地捕捉数据的变化,但会导致计算量变大;较长的步长计算效率更高,但可能会遗漏数据的局部变化。因此,本文针对ML3.0~3.9和ML3.0~4.9地震事件,在相同窗口的条件下对比步长设置为1、3、5对结果的影响(图 8)。结果表明,采用1次地震为步长时曲线波动较为明显,3次地震为步长时波形特征较为清晰,而5次地震为步长时曲线趋于平滑,小幅波动被抑制。尽管步长不同会导致曲线的平滑度和细节呈现存在差异,但不同步长计算得到的视应力时间变化趋势总体一致。对ML3.0~4.9地震事件的进一步分析亦呈现相同规律。因此,在利用该方法计算视应力时间变化趋势时,步长的选择主要影响视应力结果的细节展示和平滑度,在本文研究中对视应力的总体变化趋势未产生影响。
研究表明,视应力开始变化的时间和b值的变化时间存在差异。在2014-08-21 M4.7地震前(图 3和4),视应力约在2012年开始上升,b值约在2012年开始下降;在2021-05-21主震前,视应力约从2017年开始逐渐升高,但b值约在2020年开始下降。这些计算结果表明,视应力与b值对于区域应力变化的灵敏度可能存在差异。尽管二者显示的应力增强的起始时间不同,但震前视应力的持续高值与b值的持续低值共同指示了震源区应力水平的显著增强。因此,视应力与b值可以作为互补的指标,共同有效地揭示震源区应力状态的变化[30]。由于反演构造应力场演化需要大量的震源机制解,本文前震震源机制解数量相对较少,无法获得构造应力场的时间演化,仅获得主震前后的应力场,验证了主震对震源区应力场的扰动。
本文主要关注漾濞地震震源区应力变化,但在图 3、4和8中,2014-08出现应力高值现象,针对该应力高值查找地震目录发现,2014-08-21发生4.7级地震,推测该地震可能与该应力高值对应。仔细分析图 3(a)和3(c)及图 8(a)和8(b)后发现,其变化趋势存在不一致现象。首先,从总体上看,ML3.0~3.9地震得到的视应力总体变化范围小于ML3.0~4.9地震得到的结果,该现象正是部分研究结果给出的视应力大小与震级存在线性相关性[8]所致。其次,虽然图 3(a)和8(a)中该处视应力变化趋势与图 3(c)和8(b)趋势相反,但图 3(a)和8(a)中的变化幅度小,考虑到视应力计算结果存在误差,因此认为图 3(c)和8(b)中的大幅度变化结果更可靠。综上,本文认为图 3(c)、8(b)和图 4中共同指示的应力高值结果较为可靠,但图 3(a)和8(a)中出现的小幅度趋势不一致现象仍需进行进一步研究。
本文旨在利用相同数据计算描述震源区应力变化的不同参数,考察这些参数在孕震过程中表现的异同,并试图利用这些参数共同刻画震源区应力变化过程。但在实施过程中,由于不同参数的计算条件不同,使其各自以单独计算为主。但相较于已有研究往往仅关注某一个应力参数的变化,本文则对得到的结果进行比较,得到不同应力参数在描述应力变化过程中的异同,如视应力和b值在震前都出现变化,但出现变化的时间不同,反映了不同参数对应力场变化的敏感度不同。本文是利用多应力参数研究震源区应力场演化的初次尝试,如何综合利用视应力、b值和构造应力场分析震源区应力的时间演化及其孕震指示意义,还需进行进一步论证。
本文从视应力、b值和构造应力场的角度综合分析了漾濞地震震源区应力演化过程,揭示了主震孕育过程中震源区应力的积累与释放。得出以下结论:
1) 2010—2021年漾濞地震震源区视应力时变结果显示,主震前视应力有明显上升,主震后视应力下降,呈现先上升-后下降的趋势。视应力的持续升高反映了震源区应力在漾濞主震发生前持续积累和不断增强的过程。
2) b值随时间的变化显示,漾濞地震前研究区域b值显著下降,表明在孕震阶段震源区应力增强。
3) 构造应力场结果表明,主震对震源区应力场产生扰动,地震后σ3轴出现逆时针旋转,该结果与视应力和b值变化共同验证了主震对震源区应力的释放。
  • 国家自然科学基金(42364005)
  • 国家自然科学基金(42174074)
  • 江西省科技计划项目(DHSQT42023003)
  • 江西省科技计划项目(20232ACB213013)
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2026年第46卷第7期
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doi: 10.14075/j.jgg.2025.10.339
  • 接收时间:2025-10-11
  • 首发时间:2026-10-30
  • 出版时间:2026-07-15
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  • 收稿日期:2025-10-11
基金
国家自然科学基金(42364005)
国家自然科学基金(42174074)
江西省科技计划项目(DHSQT42023003)
江西省科技计划项目(20232ACB213013)
作者信息
    1 东华理工大学地球物理与空间探测学院, 南昌, 330013
    2 中国地震局地球物理研究所, 北京, 100081
    3 上海市地震局, 上海, 200062
    4 江西省地震局, 南昌, 330026
    5 东华理工大学理学院, 南昌, 330013
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
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
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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