利用重复地震观测重庆武隆地区地壳介质变化

汪建; 杨亚运; 马伟

doi:10.3969/j.issn.2096-7780.2021.11.003

利用重复地震观测重庆武隆地区地壳介质变化

doi: 10.3969/j.issn.2096-7780.2021.11.003

重庆市地震局，重庆 401147

基金项目: 中国地震局监测、预报、科研三结合项目（3JH-2021040）与重庆市地震局科研项目联合资助。

详细信息

通讯作者:
汪建（1987-），男，工程师，主要从事重复地震等研究。E-mail：373271967@qq.com

中图分类号: P315
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出版历程
- 收稿日期: 2021-10-16
- 修回日期: 2021-11-26

Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes

Chongqing Earthquake Agency, Chongqing 401147, China

摘要

摘要: 选取重庆数字地震台网记录的武隆地区107次M_L≥1.5地震波形和观测报告资料，采用波形互相关技术进行相关计算，识别出12组同时被3个地震台站记录且各台波形互相关系数不小于0.8的重复地震。利用射线追踪方法，对武隆地区重复地震位置做归一化处理，得到所选台站记录地震P波走时差变化，结果显示：在2017年武隆M_S5.0地震前4年，武隆、仙女山、涪陵地震台记录到P波走时差均存在长期的负异常变化，持续时间长达339天，共出现18次负值，表明该时段地壳介质速度有明显升高现象。
- 重复地震 /
- 射线追踪 /
- P波走时差 /
- 武隆地区
Abstract: The waveform and observation report data of 107 earthquakes with M_L≥1.5 recorded by Chongqing Digital Seismic Network in Wulong area were selected. The waveform cross-correlation technology was used for correlation calculation. 12 groups of repeating earthquakes with waveform correlation coefficient larger than 0.8 and recorded by 3 seismic stations at the same time were identified. The position of repeating earthquakes in Wulong area was normalized by ray tracing method, and the change of P-wave travel-time difference of the selected stations was obtained. The results show that four years before the 2017 Wulong M_S5.0 earthquake, there are long-term negative abnormal changes in P-wave travel-time difference recorded by Wulong, Xiannushan and Fuling seismic stations, lasting for 339 days, with a total of 18 negative values. It shows that the crustal medium velocity increases obviously in this period.
- repeating earthquakes /
- ray tracing /
- P-wave travel-time difference /
- Wulong area

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图 1 台站和震中分布

Figure 1. Distribution of seismic stations and epicenters

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图 2 3个台站P波走时差变化（原始曲线）

Figure 2. Variation of P-wave travel-time difference at three stations (original curve)

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图 3 3个台站P波走时差变化（校正曲线）

Figure 3. Variation of P-wave travel-time difference at three stations (correction curve)

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图 4 朗溪台（LAX）P波走时差变化

Figure 4. P-wave travel-time difference curves at Langxi station

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表 1 武隆地区3台相关重复地震

Table 1. Correlated repeating earthquakes at three stations in Wulong area

序号	发震时刻	$\varphi $/°N	λ/°E	M_L	深度 /km	组间距 /km	序号	发震时刻	$\varphi $/°N	λ/°E	M_L	深度 /km	组间距 /km
1	2011-08-04T06:01	29.382	107.967	1.7	5.0	5.5	7	2015-04-05T03:24	29.358	107.893	2.0	6.0	2.8
1	2013-02-05T14:42	29.374	107.911	1.8	6.0	5.5		2015-04-07T22:26	29.358	107.885	2.3	6.0
2	2013-02-03T08:31	29.378	107.951	3.3	6.0	3.9		2015-04-07T23:25	29.377	107.874	1.7	5.0
2	2013-02-04T03:44	29.373	107.911	1.5	6.0	3.9	8	2015-04-07T23:25	29.377	107.874	1.7	5.0	0.2
3	2013-02-03T23:44	29.386	107.965	2.0	7.0	0.2	8	2015-04-09T03:27	29.375	107.893	1.8	6.0	0.2
3	2013-02-08T09:32	29.386	107.963	1.6	6.0	0.2	9	2015-04-07T23:25	29.377	107.874	1.7	5.0	3.2
4	2013-02-05T14:42	29.374	107.911	1.8	6.0	3.7	9	2015-04-09T03:47	29.371	107.906	1.8	6.0	3.2
4	2013-02-09T18:15	29.394	107.941	1.6	5.0	3.7	10	2015-11-18T01:37	29.376	107.881	2.2	6.0	1.3
5	2013-05-14T19:15	29.385	107.989	2.3	5.0	0.3	10	2015-11-18T08:49	29.364	107.881	2.4	6.0	1.3
5	2013-05-14T20:06	29.386	107.992	2.1	5.0	0.3	11	2017-11-23T18:30	29.387	107.926	1.9	7.0	3.8
6	2013-05-14T20:06	29.386	107.992	2.1	5.0	5.3	11	2017-11-30T14:46	29.402	107.961	1.8	6.0	3.8
6	2013-05-14T22:24	29.399	107.939	1.7	6.0	5.3	12	2017-11-23T18:59	29.395	107.956	2.0	9.0	0.9
							12	2017-11-30T14:46	29.402	107.961	1.8	6.0	0.9
注：以上地震对同时满足相关系数不小于0.8的成对条件

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表 2 武隆地区速度结构模型^[15]

Table 2. The seismic velocity model used in the location^[15]

模型参数	地壳分层
模型参数	1	2	3	4	5	6	7	8	9	10
深度/km	2	4	6	8	10	12	14	16	18	20
P波速度/km•s⁻¹	5.46	5.66	5.84	6.02	6.10	6.31	6.33	6.38	6.49	6.54

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