2023年土耳其双震静态应力触发研究

张小娟; 盛书中; 葛坤朋; 胡捷

doi:10.11899/zzfy20230308

2023年土耳其双震静态应力触发研究

doi: 10.11899/zzfy20230308

1.
东华理工大学, 地球物理与测控技术学院, 南昌 330013
2.
湖南省地震局, 长沙 410004

基金项目: 国家自然科学基金项目（42174074、41704053）；江西省科技计划项目（20212BCJ23002、20232ACB213013）；东华理工大学博士科研启动基金（DHBK2019084）

详细信息

作者简介:
张小娟，女，生于1984年。硕士研究生。主要从事发震构造和应力触发等方面研究工作。E-mail：zhangxiaojuangd@qq.com

通讯作者:
盛书中，男，生于1982年。教授。主要从事构造应力场、应力触发等方面研究工作。E-mail：ssz@cea-igp.ac.cn

12 震情简介参考https://www.scieau.com/articles/2023028636
23 https://earthquake.usgs.gov/earthquakes/browse/significant.php?year=2023
34 http://www.koeri.boun.edu.tr/sismo/2/latest-earthquakes/automatic-solutions/
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出版历程
- 收稿日期: 2023-03-16
- 刊出日期: 2023-08-31

Study on the Static Stress Triggering Effect of the 2023 Turkey Doublet Earthquakes

1.
School of Geophysics and Measurement-control Technology, East China University of Technology, Nanchang 330013, China
2.
Hunan Earthquake Agency, Changsha 410004, China

摘要

摘要: 为了研究2023年土耳其双震间是否存在应力触发作用以及双震对周边断裂和余震的影响，本文基于USGS给出的双震破裂模型、全球震源机制解（GCMT）目录和土耳其海峡大学坎迪利天文台与地震研究所区域地震海啸监测中心实时地震资料，利用Coulomb 3.3软件从静态应力触发角度对土耳其双震序列进行了研究。研究结果表明：第1次主震在第2次主震震源处产生的库仑应力量值为0.033 MPa，超过应力触发阈值0.01 MPa，反映出第2次主震的发生受到第1次主震的触发作用。两次主震在第1次主震所在的东安纳托利亚断裂破裂段的东北部和西南部有应力加载作用，且加载的库仑应力量值较大；在7.8级地震破裂段上的作用为应力卸载，即发震段应力得到释放。两次主震在第2次主震所在的卡达克断裂的破裂段1和3交汇部位产生了应力卸载作用。余震库仑应力计算结果表明2次主震对余震存在明显的触发作用。上述研究结果可以为后续地震危险性分析等相关研究提供参考。
- 土耳其地震 /
- 双震 /
- 静态应力触发 /
- 震源机制解 /
- 发震断层
Abstract: In order to investigate the stress triggering between the doublet Earthquakes in Turkey in 2023 and the impact of the doublet earthquakes on surrounding faults and aftershocks, this study utilized the doublet earthquakes rupture models provided by the US Geological Survey (USGS), the Global Centroid Moment Tensor (GCMT) catalog, and real-time seismic data from the Bogazici University Kandilli Observatory and Earthquake Research Institute Regional Earthquake-Tsunami Monitoring Center to calculate the static Coulomb stress by using Coulomb3.3. The results of this study show that the Coulomb stress value generated by the first mainshock at the hypocenter of the second mainshock is 0.033 MPa, exceeding the stress triggering threshold of 0.01 MPa. This indicates that the occurrence of the second mainshock is triggered by the first mainshock. The two mainshocks exert stress loading on the northeast and southwest of the East Anatolian fault, where the first mainshock ruptured. In addition, the loading Coulomb stress value is relatively large. On the rupture segment of the magnitude 7.8 earthquake, there is a stress unloading, indicating the stress release in the fault rupture segment. The two mainshocks exert stress unloading at the intersection of rupture’s segment 1 and segment 3 of the Cardak fault, where the second mainshock occurred. The calculated Coulomb stress of aftershocks indicates that the two mainshocks have a significant triggering effect on the aftershocks. The results of this study can provide references for subsequent research on earthquake hazard analysis and related studies.
- Turkey earthquake /
- Doublet earthquakes /
- Static stress triggering /
- Focal mechanism /
- Seismogenic fault
注释:

1) 12 震情简介参考https://www.scieau.com/articles/2023028636

2) 23 https://earthquake.usgs.gov/earthquakes/browse/significant.php?year=2023

3) 34 http://www.koeri.boun.edu.tr/sismo/2/latest-earthquakes/automatic-solutions/

HTML全文

图 1 研究区地质构造与地震分布图

Figure 1. Geological structure and earthquake distribution of the study area

下载: 全尺寸图片幻灯片

图 2 M7.8地震在M7.5地震破裂面上产生的库仑应力分布

Figure 2. The Coulomb stress change distribution on the rupture plane of the M7.5 earthquake caused by the M7.8 mainshock

下载: 全尺寸图片幻灯片

图 3 第1次主震在周边断裂上产生的库仑应力变化图

Figure 3. The coulomb stress change on the surrounding active faults caused by the first mainshock

下载: 全尺寸图片幻灯片

图 4 双震在周边断裂上产生的库仑应力变化图

Figure 4. The coulomb stress change on the surrounding active faults caused by the doublet earthquakes

下载: 全尺寸图片幻灯片

图 5 双震产生的库仑应力及余震分布图

Figure 5. The distribution of aftershocks and coulomb stress caused by the doublet earthquakes

下载: 全尺寸图片幻灯片

表 1 震源机制解参数表

Table 1. The parameter table of focal mechanisms

序号	发震时间/ 年-月-日	纬度/（°）	经度/（°）	震级M_W	深度/km	节面1			节面2
序号	发震时间/ 年-月-日	纬度/（°）	经度/（°）	震级M_W	深度/km	走向/（°）	倾角/（°）	滑动角/（°）	走向/（°）	倾角/（°）	滑动角/（°）
1	1979-12-28	37.47	35.85	5.4	41.0	231	90	0	141	90	180
2	1986-05-05	37.97	37.77	6.0	10.0	260	54	9	164	82	144
3	1986-06-06	37.97	37.88	5.8	10.0	250	90	0	160	90	180
4	1989-06-24	36.70	35.88	5.1	41.0	27	62	−88	203	28	−93
5	1991-04-10	37.21	36.01	5.3	33.0	29	72	−70	160	27	−136
6	1997-01-22	36.25	35.95	5.7	10.0	243	39	−15	345	81	−128
7	1998-05-09	38.28	38.99	5.1	10.0	251	83	−7	341	83	−173
8	1998-06-27	36.88	35.31	6.3	5.8	53	81	15	321	75	171
9	1998-07-04	36.877	35.32	5.4	33.0	72	55	8	338	84	145
10	2001-06-25	37.24	36.21	5.4	5.0	1	75	−92	189	15	−83
11	2003-07-13	38.29	38.96	5.5	10.0	72	89	1	342	89	179
12	2005-11-26	38.26	38.81	5.1	8.5	237	51	−20	339	75	−139
13	2006-03-29	35.25	35.43	5.0	27.3	219	43	−10	317	83	−132
14	2008-09-03	37.51	38.50	5.0	5.7	219	79	−10	311	80	−169
15	2008-11-12	38.84	35.52	5.1	10.0	227	70	−13	321	78	−160
16	2010-11-14	36.58	36.01	4.9	2.5	24	53	−94	211	37	−84
17	2012-07-22	37.55	36.38	4.8	7.6	38	53	−78	198	38	−106
18	2012-09-19	37.31	37.10	5.0	7.0	210	48	−11	307	82	−138
19	2014-02-14	36.74	36.08	4.9	10.0	35	70	−59	155	36	−144
20	2014-06-09	36.74	36.05	4.8	17.6	34	65	−63	164	36	−135
21	2015-11-29	38.82	37.74	5.1	10.0	338	72	161	74	72	19
22	2017-03-02	37.62	38.43	5.6	10.0	225	78	−21	319	69	−167
23	2018-04-24	37.60	38.51	5.2	10.0	212	63	−3	304	87	−153
24	2018-10-02	37.67	37.40	4.7	5.0	242	90	−42	332	48	−180
25	2019-03-25	38.69	38.07	4.9	10.0	343	64	−157	242	70	−28
26	2020-02-25	38.34	38.80	5.0	10.0	232	40	−29	345	72	−127
27	2020-04-03	35.94	35.49	4.8	12.7	345	50	−117	204	47	−61
28	2020-04-15	35.86	35.53	4.9	10.0	219	47	−10	316	83	−137
29	2020-06-05	38.24	38.76	5.1	10.0	234	49	−24	340	72	−137
30	2020-08-04	38.19	38.70	5.6	10.0	235	75	−15	329	76	−165
31	2020-09-08	38.06	38.78	4.8	10.0	238	63	−7	332	83	−153
32	2021-11-12	38.20	38.78	5.0	7.0	237	82	−25	330	65	−171
33	2022-04-09	38.11	38.67	5.3	10.0	248	83	−14	340	77	−173
34	2022-10-11	37.26	36.23	5.0	10.0	17	52	−80	181	39	−103
35	2023-02-06	37.17	37.03	7.8	17.9	54	70	11	320	80	160
36	2023-02-06	37.13	36.94	6.8	14.5	211	66	−13	306	78	−156
37	2023-02-06	38.02	37.20	7.7	10.0	261	42	−8	358	84	−132
38	2023-02-07	37.76	37.74	5.5	10.0	204	54	10	108	80	144
39	2023-02-08	37.95	37.65	5.5	7.5	206	74	177	297	87	16
40	2023-02-20	36.11	36.02	6.3	16.0	227	45	−16	329	79	−134

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