2010年智利Bio-Bío <i>M</i><sub>W</sub>8.8地震前震中附近地区断层面上的摩擦系数变化特征

陈学忠; 郭祥云; 李艳娥

doi:10.19987/j.dzkxjz.2022-027

2010年智利Bio-Bío M_W8.8地震前震中附近地区断层面上的摩擦系数变化特征

doi: 10.19987/j.dzkxjz.2022-027

中国地震局地球物理研究所，北京 100081

详细信息

通讯作者:
陈学忠（1963-），男，研究员，主要从事地震学与地震预测研究。E-mail：cxz8675@163.com

中图分类号: P315.3⁺3
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出版历程
- 收稿日期: 2022-02-15
- 录用日期: 2022-04-17
- 网络出版日期: 2022-05-17

The variation features of friction coefficient on the fault planes around the epicenter preceding the 2010 Bio-Bío, Chile M_W8.8 earthquake

Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

摘要

摘要: 利用1990年1月1日—2010年2月26日期间发生在2010年智利Bio-Bío M_W8.8地震震中附近地区的100次5.0≤M_W≤6.9地震震源机制解结果，计算了断层面上的摩擦系数，并得到了摩擦系数随时间的变化。结果表明，震前从2006年初开始直至临近主震发生的约4年零2个月时间内，震中附近地区发震断层面上的摩擦系数随时间呈趋势下降变化；从2006年初的约0.73下降到临震前的约0.4，相对下降幅度达45.2%。这个结果对认识强震孕育过程以及地震预测研究均具有启示意义。
- 智利M_W8.8地震 /
- 断层面 /
- 摩擦系数 /
- 变化特征
Abstract: For one hundred earthquakes （5.0≤M_W≤6.9） that occurred around the epicenter of the 2010 Bio-Bío, Chile M_W8.8 earthquake from 1 January 1990 to 26 February 2010, their focal mechanism solutions were used to calculate the friction coefficient on the fault plane and the friction coefficient as a function of time. The results show that within the period of four years and two months from the beginning of 2006 until the occurrence of the Bio-Bío mainshock the friction coefficient around the epicentral area showed a decreasing trend, dropped from about 0.73 at the beginning of 2006 to about 0.4 immediately towards the occurrence of the Bio-Bío mainshock, with a relative decrease of 45.2%. It will be of great significance for understanding the occurrence process of strong earthquakes and earthquake prediction.
- Chile M_W8.8 earthquake /
- fault plane /
- friction coefficient /
- variation features

HTML全文

图 1 1990年1月1日—2010年2月26日5.0≤M_W≤6.9地震震中分布（“〇”）。黑色四边形为研究区，红色五角星“☆”为2010年智利Bio-Bío M_W8.8地震震中

Figure 1. Spatial distribution of epicenters for 5.0≤M_W≤6.9 earthquakes that occurred from 1 January 1990 to 26 February 2010. The region marked by the black solid line is the study region in this paper. The red star “☆” shows the epicenter of the 2010 Bio-Bío, Chile M_W8.8 earthquake

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图 2 研究区地震的M-t图

Figure 2. Magnitude versus time for earthquakes

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图 3 μ值随时间的变化

Figure 3. μ as a function of time

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图 4 视应力随时间的变化^[6]

Figure 4. Apparent stress as a function of time^[6]

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表 1 2010年智利Bio-Bío M_W8.8地震前发生在研究区内地震的震源机制解

Table 1. The focal mechanism solutions for earthquakes occurring in the study area before the 2010 Bio-Bío, Chile M_W8.8 earthquake

序号	发震时刻（BJT）（年-月-日时:分:秒）	南纬 /°	西经 /°	震级（M_W）	节面Ⅰ				节面Ⅱ
序号	发震时刻（BJT）（年-月-日时:分:秒）	南纬 /°	西经 /°	震级（M_W）	走向/°	倾角/°	滑动角/°		走向/°	倾角/°	滑动角/°
1	1990-04-02 13:56:37.9	33.04	72.63	5.6	6	36	106		167	56	79
2	1990-04-21 18:54:56.5	37.28	73.79	5.8	352	17	80		183	73	93
3	1990-04-22 20:25:27.7	38.07	73.60	5.6	347	16	81		177	74	93
4	1990-08-02 05:24:14.1	32.14	72.20	6.0	2	27	95		177	63	87
5	1990-10-11 04:25:28.7	34.17	72.07	5.4	329	11	58		182	81	96
6	1991-08-18 21:52:13.9	31.95	71.90	5.2	312	18	37		186	79	105
7	1992-04-10 09:33:12.2	33.68	71.70	5.1	248	57	−172		154	83	−33
8	1992-05-03 03:40:42.9	32.36	71.66	5.5	275	4	23		162	88	94
9	1992-05-18 03:02:26.5	33.61	72.03	6.1	19	8	120		169	83	86
10	1992-05-22 01:20:43.3	33.84	72.42	5.5	0	21	92		178	69	89
11	1992-11-04 21:32:41.1	31.98	72.21	6.0	0	28	93		177	62	89
12	1992-11-28 03:13:38.0	31.59	72.08	6.4	51	52	−177		319	87	−38
13	1993-01-01 09:56:34.0	31.93	71.66	5.3	356	19	92		174	71	89
14	1993-03-17 04:35:58.3	38.67	75.37	5.6	224	30	−37		348	72	−115
15	1993-07-16 21:21:35.2	33.32	72.56	5.6	7	18	111		164	73	83
16	1993-12-04 23:16:59.4	33.57	72.22	5.6	35	16	140		163	80	77
17	1994-04-16 09:55:26.3	32.23	71.84	5.6	10	26	108		171	65	81
18	1994-06-16 00:47:27.1	32.99	71.96	5.1	10	22	112		166	70	81
19	1994-09-12 06:30:01.0	31.26	72.13	5.9	306	21	51		167	74	103
20	1994-09-14 05:02:18.1	31.23	72.09	5.4	26	32	131		160	66	68
21	1994-09-17 12:22:20.5	32.48	72.01	5.7	11	26	83		199	64	93
22	1994-09-22 14:24:38.4	32.07	71.90	5.4	61	36	21		314	78	124
23	1994-10-11 01:37:25.1	32.22	71.91	5.7	284	33	37		162	71	118
24	1995-03-23 09:18:25.1	36.33	72.81	5.5	21	6	120		170	85	87
25	1995-04-28 02:04:24.4	32.06	71.99	5.1	126	42	61		342	54	114
26	1995-06-02 19:07:24.8	31.72	71.64	5.5	166	14	−73		328	76	−94
27	1995-07-01 09:14:56.1	34.14	72.84	5.2	7	24	108		168	67	82
28	1995-09-17 07:25:33.8	35.61	74.47	5.6	184	42	−124		46	56	−63
29	1995-10-01 12:50:18.7	31.33	71.76	5.4	180	18	−74		344	73	−95
30	1995-10-03 16:08:20.4	30.86	72.65	5.7	9	41	104		171	51	79
31	1995-11-21 18:17:09.2	33.33	72.30	5.7	355	20	84		181	71	92
32	1996-02-22 13:40:57.5	33.53	72.00	5.9	93	40	49		321	61	119
33	1996-09-09 00:20:45.2	32.06	71.94	5.9	334	40	55		196	58	116
34	1997-06-09 14:45:29.6	32.08	71.83	5.1	266	39	−9		3	85	−129
35	1997-07-29 00:31:21.4	30.87	72.96	5.2	340	46	65		194	49	114
36	1998-01-12 10:14:15.8	31.25	71.87	6.6	355	27	91		174	63	90
37	1998-06-06 12:16:22.2	36.56	73.20	5.2	341	12	65		186	79	95
38	1998-07-29 07:14:28.6	32.30	71.67	6.4	181	40	116			329	55	70
39	1998-10-10 04:12:10.6	33.87	72.48	5.6	352	26	87	175		64	91
40	1999-04-30 19:28:50.3	31.90	72.27	5.5	355	29	81	185		61	95
41	1999-09-29 18:01:34.2	30.94	72.60	5.7	352	31	87	175		59	92
42	1999-11-03 13:59:23.0	37.70	73.93	5.3	28	7	132	166		85	85
43	1999-11-03 15:19:22.3	37.70	73.64	5.2	96	55	179	187		89	35
44	1999-11-20 21:52:53.1	30.79	72.66	5.2	11	40	106	171		52	77
45	2000-03-26 03:32:41.8	32.50	72.16	5.2	330	30	55	189		66	108
46	2001-01-07 10:18:28.3	33.52	72.33	5.9	353	23	85	178		67	92
47	2001-03-15 13:02:44.7	32.61	72.04	5.9	144	38	59	2		58	112
48	2001-04-09 09:01:05.4	32.88	73.23	6.6	219	44	−86	33		46	−94
49	2001-07-24 17:42:45.3	33.22	72.17	5.2	334	40	87	158		50	93
50	2001-11-03 01:43:27.5	36.19	72.02	5.1	274	33	25	163		77	120
51	2002-05-24 00:23:20.5	32.17	71.52	5.5	9	40	107	167		52	76
52	2002-06-18 13:56:30.7	31.04	71.63	6.4	353	29	96	166		61	87
53	2002-06-23 11:10:44.7	31.49	71.54	5.2	334	42	−113	184		52	−71
54	2003-02-28 01:40:25.3	35.41	73.56	5.3	26	18	115	180		74	82
55	2003-04-14 14:42:34.7	35.38	72.90	5.2	18	44	158	124		75	48
56	2003-06-02 02:52:15.0	33.08	72.40	5.5	9	25	92	187		65	89
57	2003-06-19 23:05:02.0	30.89	72.14	5.6	2	26	98	173		64	86
58	2004-01-19 05:47:29.2	31.85	72.07	5.3	358	25	95	172		65	88
59	2004-05-03 04:36:54.9	37.95	73.75	6.6	0	16	118	151		76	82
60	2004-06-15 11:16:32.7	38.96	73.62	5.9	172	52	150	281		67	42
61	2004-09-07 10:57:44.0	34.10	72.49	5.2	10	16	105	174		74	86
62	2004-09-07 12:33:59.6	34.14	72.52	5.7	6	10	102	174		80	88
63	2004-09-08 08:16:07.1	34.13	72.40	5.1	359	23	98	170		67	86
64	2004-09-10 10:44:16.3	38.06	73.24	5.2	30	48	62	248		49	118
65	2004-09-27 22:58:29.4	32.72	72.02	5.5	17	21	109	177		70	83
66	2005-03-01 07:24:09.4	31.59	72.10	5.4	354	25	103	159		66	84
67	2005-03-13 20:39:03.0	32.72	72.02	5.2	9	24	103	175		66	84
68	2005-03-29 16:38:25.0	33.76	72.38	5.3	6	17	100	175		73	87
69	2005-04-13 09:25:27.5	33.27	73.24	5.4	21	38	−89	200		52	−91
70	2005-12-14 10:52:09.1	31.22	72.05	5.3	266	24	−18	12		83	−113
71	2005-12-26 00:56:13.7	39.01	73.74	5.1	4	32	89	185		58	91
72	2006-01-05 22:51:18.0	36.43	73.52	5.2	19	16	104	184		74	86
73	2006-02-10 17:51:59.1	32.57	71.84	5.2	11	32	97	183		59	86
74	2006-04-15 14:42:12.5	31.18	72.33	5.2	1	22	93	179		68	89
75	2006-05-18 18:26:23.4	32.34	72.14	5.0	11	24	109	170		68	82
76	2006-05-21 05:11:40.5	37.41	74.14	5.2	27	17	120	176		76	82
77	2006-07-19 22:11:30.6	32.63	72.24	5.0	336	25	74	174		66	98
78	2006-10-12 18:06:04.2	31.48	72.03	6.4	3	26	96		176	65	87
79	2006-10-13 16:12:58.8	31.55	72.02	5.3	360	26	95		174	64	88
80	2007-03-29 14:40:47.9	31.63	72.16	5.6	12	19	91		191	71	90
81	2007-03-29 17:09:10.2	31.59	72.06	5.6	29	22	112		185	69	81
82	2007-03-29 17:46:27.2	31.69	72.12	5.3	336	15	59		188	78	98
83	2007-03-29 18:32:02.6	31.72	72.23	5.0	347	31	85		172	59	93
84	2007-04-22 06:05:28.4	31.59	72.34	5.1	348	28	61		201	66	105
85	2007-06-21 09:54:59.1	31.79	71.42	5.1	359	32	94		174	58	88
86	2007-06-28 19:25:22.5	32.08	71.63	5.6	198	15	−73		0	75	−95
87	2007-08-08 14:14:23.4	32.66	71.92	5.3	335	17	78		167	74	93
88	2007-10-20 19:56:22.0	36.50	73.51	5.2	13	23	104		177	67	84
89	2007-12-15 18:22:32.1	32.81	72.02	5.9	359	21	89		179	69	90
90	2007-12-20 03:07:00.9	32.85	72.01	5.5	351	12	80		181	78	92
91	2008-11-23 21:19:44.3	36.38	73.36	5.3	11	22	111		169	69	82
92	2008-12-18 21:19:33.6	32.63	72.13	6.1	360	19	94		175	71	89
93	2008-12-18 21:50:34.0	32.62	72.11	5.9	350	18	83		177	72	92
94	2008-12-19 07:30:11.8	32.66	72.24	5.4	359	20	90		179	70	90
95	2008-12-19 09:36:08.8	32.56	72.10	5.7	2	19	100		172	72	87
96	2008-12-19 13:57:36.4	32.68	71.97	5.2	11	19	118		162	74	81
97	2008-12-19 16:48:53.6	32.60	72.25	5.2	351	23	82		180	67	93
98	2009-09-25 15:47:27.8	32.26	71.90	5.1	277	58	15		180	78	147
99	2009-10-28 06:20:03.5	32.84	72.05	5.0	164	43	86		349	47	94
100	2009-12-29 11:47:36.8	36.78	73.39	5.1	1	21	95		175	69	88

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