2022年7—9月中国大陆地区<i>M</i>≥4.0地震震源机制解测定

梁姗姗; 邹立晔; 刘艳琼; 张雪梅; 李旭茂

doi:10.19987/j.dzkxjz.2022-150

2022年7—9月中国大陆地区M≥4.0地震震源机制解测定

doi: 10.19987/j.dzkxjz.2022-150

中国地震台网中心，北京 100045

基金项目: 中国地震局常规性项目“测震学科技术管理组运维”资助。

详细信息

通讯作者:
梁姗姗（1989–），女，高级工程师，主要从事地震定位和震源机制相关研究。E-mail：liangshanshan@seis.ac.cn

中图分类号: P315.3⁺3
计量
- 文章访问数: 171
- HTML全文浏览量: 86
- PDF下载量: 45
出版历程
- 收稿日期: 2022-10-05
- 录用日期: 2022-10-15
- 网络出版日期: 2022-10-12

Determination of focal mechanism solutions of the earthquakes with M≥4.0 occurred in the mainland of China during July to September 2022

China Earthquake Networks Center, Beijing 100045, China

摘要

摘要: 利用中国地震台网记录的宽频带波形资料，采用近震全波形反演方法得到2022年7月1日—9月30日发生在中国大陆地区的M≥4.0共18次地震的震源机制解以及2022年9月5日四川泸定M6.8地震的矩心位置和矩心偏移时间。结果显示逆断型6次，走滑型7次，正断型4次，未知型1次。
- 震源机制 /
- 震源参数
Abstract: In this paper, the regional full waveform inversion of the broadband waveforms from China Seismic Network were conducted, and the focal mechanism solutions of the 18 earthquakes with M≥4.0 in the mainland of China from July 1 to September 30, 2022 were obtained. The centroid location and time shift of the M6.8 Luding, Sichuan earthquake were determinated by a grid search in the horizontal plane. The types of these focal mechanism solutions show 6 reverse faulting, 7 strike-slip faulting, 4 normal faulting and 1 unknown earthquakes.
- focal mechanism /
- source parameters

HTML全文

图 1 19次M≥4.0以上地震震中位置和所用台站分布

Figure 1. Map of the epicenters of the 19 earthquakes with M≥4.0 and the used stations

下载: 全尺寸图片幻灯片

图 2 2022年7—9月中国大陆地区M≥4.0地震类型图解

Figure 2. The ternary diagram of the focal mechanisms in the mainland of China during July to September 2022

下载: 全尺寸图片幻灯片

图 3 平面内网格搜索泸定M6.8地震最佳震源机制解

Figure 3. The best focal mechanism solution of the Luding M6.8 earthquake using grid search in the horizontal plane

下载: 全尺寸图片幻灯片

图 4 泸定地震主震震源机制解的拟合波形（红色）与观测波形（黑色）对比图，滤波频带为0.03—0.05 Hz。图中右侧字符表示台站代码，波形上方数字为方差减少量，其代表波形拟合程度

Figure 4. Comparison of the synthetic (red)and observed (black) waveforms for the Luding mainshock with best-fitting solution, the frequency range of band-pass filtering is 0.03—0.05 Hz. The station codes are plotted on the right of the figure, the numbers above the waveforms are variance reduction, which indicate for the degree of waveform fitting

下载: 全尺寸图片幻灯片

图 5 四川泸定主震和最大一次余震（M_S4.5）震源机制解

Figure 5. The focal mechanism solutions of the Luding mainshock and a largest aftershock (M_S4.5)

下载: 全尺寸图片幻灯片

表 1 2022年7—9月中国大陆地区M≥4.0地震基本参数

Table 1. Events list of the earthquakes with M≥4.0 in the mainland of China during July to September 2022

序号	发震时刻（BJT）	北纬 /°	东经 /°	深度 /km	震级（M）	参考地名
1	2022-07-02 04:13:11.1	37.59	78.60	10	5.1	新疆和田地区皮山县
2	2022-07-03 03:32:31.1	40.87	78.18	10	4.3	新疆克孜勒苏州阿合奇县
3	2022-07-03 06:02:11.5	40.88	78.14	10	5.2	新疆克孜勒苏州阿合奇县
4	2022-07-04 18:37:16.1	36.76	83.43	10	4.4	新疆和田地区民丰县
5	2022-07-05 13:08:23.9	38.73	73.76	100	4.0	新疆克孜勒苏州阿克陶县
6	2022-07-18 03:43:22.8	40.16	83.17	25	4.6	新疆阿克苏地区沙雅县
7	2022-07-20 10:33:13.9	44.46	87.15	23	4.8	新疆昌吉州昌吉市
8	2022-08-05 21:28:12.9	39.64	74.54	15	4.0	新疆克孜勒苏州乌恰县
9	2022-08-14 16:20:00.2	33.14	92.85	10	5.9	青海玉树州杂多县
10	2022-08-15 05:10:36.1	37.85	93.72	10	4.6	青海海西州直辖区
11	2022-08-15 16:30:37.6	38.43	99.26	8	4.7	青海海北州祁连县
12	2022-08-15 21:05:09.0	33.12	90.38	10	4.1	西藏那曲市安多县
13	2022-08-16 10:22:55.4	33.14	90.27	10	4.3	西藏那曲市安多县
14	2022-09-05 08:48:43.9	33.77	89.04	10	4.0	西藏那曲市双湖县
15	2022-09-05 12:52:18.4	29.59	102.08	16	6.8	四川甘孜州泸定县
16	2022-09-05 12:56:34.9	29.40	102.17	15	4.2	四川雅安市石棉县
17	2022-09-07 02:42:15.3	29.42	102.16	11	4.5	四川雅安市石棉县
18	2022-09-16 06:49:38.9	36.13	77.92	10	4.6	新疆和田地区皮山县
19	2022-09-23 10:47:41.5	24.78	98.77	9	4.5	云南保山市龙陵县

下载: 导出CSV

表 2 2022年7—9月中国大陆地区M≥4.0地震的震源机制结果

Table 2. Focal mechanisms of the earthquakes with M≥4.0 in the mainland of China during July to September 2022

序号	发震时刻（BJT）	节面Ⅰ			节面Ⅱ			P 轴		T 轴		矩心深度 /km	矩震级（M_W）	VR	CN	沙滩球
序号	发震时刻（BJT）	走向 /°	倾角 /°	滑动角 /°	走向 /°	倾角 /°	滑动角 /°	方位角 /°	仰角 /°	方位角 /°	仰角 /°	矩心深度 /km	矩震级（M_W）	VR	CN	沙滩球
1	2022-07-02 04:13:11.1	72	27	60	286	67	104	5	21	220	65	26	5.0	0.64	2.2
2	2022-07-03 03:32:31.1	250	32	89	71	58	90	160	13	342	77	5	4.4	0.75	6.9
3	2022-07-03 06:02:11.5	250	43	90	71	47	90	160	2	352	88	5	5.0	0.77	5.2
4	2022-07-04 18:37:16.1	360	62	−114	223	36	−53	228	65	107	14	6	4.7	0.76	3.5
5	2022-07-05 13:08:23.9	357	28	−84	170	62	−93	73	73	263	17	117	4.2	0.55	3.0
6	2022-07-18 03:43:22.8	256	68	−11	350	79	−158	215	23	122	8	13	5.2	0.52	1.7
7	2022-07-20 10:33:13.9	177	72	176	269	86	18	42	10	135	16	15	4.0	0.51	2.1
8	2022-08-05 21:28:12.9	98	18	78	290	73	94	17	27	206	62	5	4.3	0.61	2.6
9	2022-08-14 16:20:00.2	342	86	−166	250	76	−4	207	13	115	7	7	5.6	0.88	3.2
10	2022-08-15 05:10:36.1	117	34	88	299	56	91	28	11	214	79	14	4.7	0.64	1.9
11	2022-08-15 16:30:37.6	118	44	83	308	47	97	33	2	286	85	12	4.7	0.58	1.8
12	2022-08-15 21:05:09.0	41	59	−86	213	31	−96	322	76	128	14	5	4.5	0.77	4.7
13	2022-08-16 10:22:55.4	47	79	−77	176	16	−140	332	54	126	33	5	4.4	0.71	3.9
14	2022-09-05 08:48:43.9	135	40	−179	45	89	−50	348	33	102	32	18	4.2	0.60	2.3
15	2022-09-05 12:52:18.4	73	78	165	166	75	12	120	2	29	19	6	6.4	0.64	3.3
16	2022-09-07 02:42:15.3	238	83	178	328	88	7	103	3	193	7	7	4.6	0.76	2.9
17	2022-09-16 06:49:38.0	342	81	159	75	69	10	30	8	297	21	9	4.8	0.79	2.8
18	2022-09-23 10:47:41.5	352	65	−162	254	73	−26	212	30	305	6	4	4.4	0.78	2.6

下载: 导出CSV

参考文献(9)

[1]	梁姗姗,邹立晔,刘艳琼,等. 2021年12月中国大陆地区M≥4.0地震震源机制解测定[J]. 地震科学进展,2022,52(1):40-44 Liang S S,Zou L Y,Liu Y Q,et al. Determination the focal mechanism solutions of earthquakes with M≥4.0 occurred in the mainland of China in December 2021[J]. Progress in Earthquake Sciences,2022,52(1):40-44
[2]	梁姗姗,邹立晔,刘艳琼,等. 2022年1月中国大陆地区M_S≥4.0地震震源机制解测定[J]. 地震科学进展,2022,52(2):89-94 Liang S S,Zou L Y,Liu Y Q,et al. Determination of the focal mechanism solutions of the earthquakes with M_S≥4.0 occurred in the mainland of China in January 2022[J]. Progress in Earthquake Sciences,2022,52(2):89-94
[3]	梁姗姗,邹立晔,刘艳琼,等. 2022年2—3月中国大陆地区M_S≥4.0地震震源机制解测定[J]. 地震科学进展,2022,52(4):183-189 Liang S S,Zou L Y,Liu Y Q,et al. Determination of the focal mechanism solutions of the earthquakes with M_S≥4.0 occurred in the mainland of China during February to March 2022[J]. Progress in Earthquake Sciences,2022,52(4):183-189
[4]	梁姗姗,邹立晔,刘艳琼,等. 2022年4—6月中国大陆地区M_S≥4.0地震震源机制解测定[J]. 地震科学进展,2022,52(7):338-343 Liang S S,Zou L Y,Liu Y Q,et al. Determination of focal mechanism solutions of the earthquakes with M_S≥4.0 occurred in the mainland of China during April to June 2022[J]. Progress in Earthquake Sciences,2022,52(7):338-343
[5]	Sokos E N,Zahradnik J. ISOLA a Fortran code and a Matlab GUI to perform multiple-point source inversion of seismic data[J]. Computers and Geosciences,2008,34(8):967-977 doi: 10.1016/j.cageo.2007.07.005
[6]	Sokos E N,Zahradnik J. Evaluating centroid-moment-tensor uncertainty in the new version of ISOLA software[J]. Seismological Research Letters,2013,84(4):656-665 doi: 10.1785/0220130002
[7]	Bassin C G L,Laske G,Masters G. The current limits of resolution for surface wave tomography in North America[J]. Eos Transactions American Geophysical Union,2000,81(48):F897
[8]	Kennett B L N,Kerry N J. Seismic waves in a stratified half space[J]. Geophysical Journal International,1979,57(3):557-583 doi: 10.1111/j.1365-246X.1979.tb06779.x
[9]	Bouchon M. A simple method to calculate Green’s functions for elastic layered media[J]. Bulletin of the Seismological Society of America,1981,71(4):959-971 doi: 10.1785/BSSA0710040959