2017年8月9日精河<em>M</em><sub>S</sub>6.6地震余震序列精定位及发震构造分析足球365bet打水_365bet官网3

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引用本文: 翟亮,?张晓东,?王伟君. 2019.?2017年8月9日精河M_S6.6地震余震序列精定位及发震构造分析.?地震学报,?41(3):?314-328. doi: 10.11939/jass.20180124 shu

Citation:? Zhai Liang,?Zhang Xiaodong,?Wang Weijun. 2019.?Precise location and seismogenic structure analysis of aftershock sequence of Jinghe M_S6.6 earthquake on August 9，2017.?Acta Seismologica Sinica,?41(3):?314-328. doi: 10.11939/jass.20180124 shu

2017年8月9日精河M_S6.6地震余震序列精定位及发震构造分析

中国北京 100036 中国地震局地震预测研究所

通讯作者: 张晓东, zxd@cea-ies.ac.cn

摘要: 为确定2017年8月9日精河M_S6.6地震的发震构造，本文使用双差定位方法对发震时刻至2017年10月震源区所发生的余震进行了精定位，同时利用CAP波形反演方法，得到了主震的震源机制解，同时使用GPAT方法反演得到了部分余震的震源机制解，并基于两者对本次地震的发震构造予以分析。结果显示：精定位后主震位于（44.27°N，82.85°E），震源深度为17 km；主震最佳双力偶解对应的节面Ⅰ的走向为260°、倾角为51°、滑动角为84°，节面Ⅱ的走向为89.5°、倾角为39.4°、滑动角为97.4°；余震序列位于主震东侧，并向东展布约30 km，在3—18 km深度范围内均有分布，其优势方向为近EW向，次优势方向为SW向。结果表明，本次地震是一次逆冲型地震，通过反演得到的大量小震震源机制解的结果与主震震源机制解结果相一致。结合余震震中分布、主震及余震的震源机制解以及震源区的地质构造，本文推断近EW走向具有逆冲性质的库松木楔克山前断裂为精河主震的发震构造。

关键词:

English

Precise location and seismogenic structure analysis of aftershock sequence of Jinghe M_S6.6 earthquake on August 9，2017

Institute of Earthquake Forecasting，China Earthquake Administration，Beijing 100036，China

Corresponding author: Zhang Xiaodong, zxd@cea-ies.ac.cn

Received Date: 2018-10-17
Accepted Date: 2019-02-25
Available Online: 2019-05-01

Abstract: On August 9, 2017, an earthquake with M_S6.6 occurred in the Jinghe of Bortala Mongolia Autonomous Prefecture, Xinjiang, and the highest intensity is estimated up to Ⅷ, but no major surface ruptures had been observed in field survey. In order to determine the seismogenic structure of the Jinghe earthquake, this paper precisely locates the aftershocks occurred from the origin time of the main shock to December of 2017 in the source region by the double-difference location method. At the same time, the focal mechanism of the main shock is obtained by using the CAP waveform inversion method, and the focal mechanisms of some aftershocks are obtained by using the generalized polarization amplitude technology. The results show that the main shock is located at （44.27°N, 82.85°E） and the focal depth is 17 km. The aftershock sequence is located to the east of the main shock with focal depth of 33?18 km and an extending length nearly 30 km towards east. The predominant direction of the sequence is EW direction, and the subdominant direction is SW direction. The best double-couple solution of the main shock has one nodal plane with strike 260°, dip 51°, rake 84°, and the other nodal plane with strike 89.5°, dip 39.4°, rake 97.4°. The result suggests that the Jinghe earthquake is of thrusting type, and the focal mechanisms of a large number of small earthquakes obtained by inversion are consistent with that of the main shock. Combined with aftershock epicenters, focal mechanism solutions for the main shock and the aftershocks, as well as geological structure of the source region, it is inferred that the thrusted Kusongmuxieke piedmont fault extending in near EW direction is the seismogenic structure for the Jinghe main shock.

Key words:

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  傅征祥 , 1991:?1983年11月16日夏威夷Kaoiki地震(Mssub>=6.6)前后的小震震源机制解,?地震学报,?13,?139-149.

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图?1? 精河地震震源区及邻区构造背景

Figure?1.? Tectonic settings of the source region of Jinghe earthquake and its neighbouring areas

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图?2? 精河M_S6.6地震震中及台站分布

Figure?2.? Epicenter location of Jinghe M_S6.6 earthquake and stations distribution

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图?3? 重定位前（a）、后（b）的走时均方根误差

Figure?3.? RMS error of travel time before （a） and after （b） relocation

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图?4? 精河M_S6.6地震序列重定位前的震中分布

Figure?4.? Epicentral distribution of Jinghe M_S6.6 earthquake sequence before relocation

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图?5? 精定位后事件分布的剖面图

Figure?5.? Cross sections of the relocated earthquakes

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图?6? 2017年8月9号精河主震的CAP反演震源机制解结果

Figure?6.? Focal mechanism solution results of Jinghe earthquake on August 9，2017 by the CAP method

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图?7? 精河地震的拟合差和震源机制解（下半球投影）随矩心深度的变化

Figure?7.? Misfit plots as a function of centroid depth for Jinghe earthquake （lower-hemisphere projection）

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图?8? 精河地震序列中M_L＞3.0事件的震源机制解

Figure?8.? Focal mechanism solutions for the M_L＞3.0 events of Jinghe earthquake sequence

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图?9? 精河地震序列的节面走向（a）、倾角（b）、滑动角（c）玫瑰花图

Figure?9.? Rose maps of the strike （a），dip （b） and rake （c） of nodal planes for the Jinghe earthquake sequence

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图?10? 精河地震序列P轴（左）和T轴（右）的方位角（a）和倾角（b）的玫瑰花图

Figure?10.? Rose maps of the azimuth （a） and plunge （b） of P-axis （left panels） and T-axis （right panels） for the Jinghe earthquake sequence

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地层深度/km	v_P/（km·s^?1）	v_S/（km·s^?1）
0—4	4.00	2.31
4—16	5.81	3.36
16—25	6.10	3.53
25—34	6.65	3.84
34—45	6.83	3.95
＞45	8.09	4.68

表?1? 速度结构（邵学钟等，1996）

Table?1.? Velocity structure （after Shao et al，1996）

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来源	M_W	矩心深度/km	走向/°	倾角/°	滑动角/°
USGS （2017）	6.3	20	269	30	87
GCMT （2017）	6.3	27.8	244	52	66
中国地震局地球物理研究所（2017）	6.25	20	262	45	80
中国地震台网中心（2017）	6.3	23	269	47	99
本文	6.15	17	260	51	84

表?2? 2017年8月9日精河M_S6.6主震震源机制解结果对比

Table?2.? Comparison of focal mechanism solutions of Jinghe M_S6.6 main shock on August 9，2017

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反演方法	节面Ⅰ			节面Ⅱ			短心深度/km
反演方法	走向/°	倾角/°	滑动角/°	走向/°	倾角/°	滑动角/°	短心深度/km
GPAT	281	41	73	123	51	104	14
CAP	279	44	83	108.7	46	96.7	18

表?3? 使用GPAT和CAP方法所得2017年9月9日M_L4.3地震反演结果的对比

Table?3.? Comparison of inversion results for the M_L4.3 earthquake on September 9，2017 by using GPAT and CAP methods

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事件	震中位置		深度 /km	M_L	节面Ⅰ			P轴		T轴
事件	东经/°	北纬/°	深度 /km	M_L	走向/°	倾角/°	滑动角/°	方位角/°	倾角/°	方位角/°	倾角/°
1	82.61	44.29	13.0	4.1	270.3	44.1	93.1	178.1	0.9	?68.3	87.6
2	82.74	44.31	8.0	3.5	258.3	37.0	88.7	169.2	8.0	?5.1	82.0
3	82.78	44.21	7.0	3.1	332.0	53.0	157.3	210.0	18.0	310.0	40.0
4	82.65	44.26	8.0	3.1	230.2	89.0	13.0	4.3	8.4	95.8	9.9
5	82.74	44.32	5.0	3.0	240.0	81.0	90.2	?30.2	36.0	150.2	54.0
6	82.85	44.30	6.0	3.8	234.0	80.0	?18.0	?170.4	19.8	?78.5	5.3
7	82.65	44.25	11.0	3.0	321.0	32.0	90.0	?129.0	13.0	51.0	77.0
8	82.76	44.25	11.0	2.5	223.0	58.3	9.4	179.5	15.9	80.8	28.0
9	82.74	44.25	11.0	3.8	285.6	15.0	?37.3	?52.1	52.6	152.3	34.9
10	82.68	44.24	8.0	3.1	251.4	56.1	71.7	?5.6	9.4	115.1	72.1
11	82.64	44.26	12.0	2.7	221.0	43.0	131.0	103.0	8.8	?150.2	61.8
12	82.73	44.28	7.0	2.5	286.7	9.1	173.6	121.8	43.3	?76.1	45.3
13	82.71	44.24	12.0	2.2	211.0	62.0	?9.0	171.7	25.4	75.1	13.6
14	82.75	44.29	12.0	2.5	280.6	38.0	3.2	?112.9	32.2	130.4	35.6
15	82.71	44.29	15.0	3.9	227.5	64.3	109.8	?57.0	17.0	172.0	65.0
16	82.67	44.28	7.0	1.8	284.3	20.2	70.5	?150.5	25.7	46.1	63.4
17	82.69	44.27	6.0	1.7	315.6	45.5	?103.1	143.3	80.7	?125.2	0.3
18	82.89	44.10	8.0	1.8	210.5	39.3	?76.3	?122.9	79.2	110.8	6.4
19	82.57	44.26	6.0	2.1	294.6	50.9	144.2	169.3	7.2	?92.1	50.1
20	82.75	44.29	12.0	3.1	270.2	40.5	64.8	?162.1	7.0	85.0	72.4
21	82.87	44.29	8.0	3.6	270.9	57.1	?138.2	123.5	51.2	32.7	0.7
22	82.71	44.24	13.0	1.6	305.6	26.8	157.4	166.3	30.6	?61.1	48.9
23	82.73	44.28	11.0	1.5	232.4	79.1	?172.9	96.4	12.7	?173.0	2.7
24	82.75	44.27	10.0	1.6	218.1	86.1	64.3	?29.6	36.0	103.3	43.1
25	82.69	44.31	11.0	1.5	257.5	59.1	63.2	6.4	10.3	119.1	64.8
26	82.70	44.29	8.0	2.1	290.1	78.4	145.2	?16.8	14.7	?116.4	32.5
27	82.72	44.28	13.0	2.9	279.8	41.9	118.3	170.1	6.3	?81.7	70.4
28	82.60	44.29	11.0	2.3	233.0	73.4	38.9	?2.6	12.9	98.0	38.9
29	82.40	44.10	9.0	3.0	259.6	49.6	47.6	?161.9	3.5	102.4	58.9
30	82.77	44.29	7.0	3.2	272.0	49.8	?139.2	116.3	54.0	?145.4	5.9
31	82.77	44.29	6.0	3.6	282.8	40.3	95.9	169.3	27.8	?48.3	56.4
32	82.77	44.29	11.0	4.0	183.0	68.0	93.0	?89.3	22.9	98.4	66.9
33	82.77	44.29	7.0	3.1	286.8	53.9	?120.7	137.4	65.2	38.0	4.3
34	82.78	44.19	8.0	2.6	235.6	82.4	19.2	8.0	7.9	100.7	18.9
35	82.72	44.29	18.0	3.7	277.1	44.4	122.9	164.4	5.2	?93.3	67.0
36	82.96	44.34	14.0	1.8	268.3	40.0	40.0	122.2	155.9	9.0	?91.0
37	82.70	44.30	6.0	2.0	279.8	49.2	108.3	?3.0	2.6	?103.7	76.0
38	82.59	44.25	6.0	3.0	263.3	32.7	72.4	?174.0	13.4	42.4	73.6
39	82.34	44.26	11.0	1.8	244.4	61.3	43.3	5.5	4.9	?101.4	49.9
40	82.71	44.32	11.0	2.0	227.4	15.0	37.3	?179.3	34.9	25.1	52.6
41	82.41	44.14	9.0	2.1	231.0	85.0	97.0	?45.5	39.6	148.6	49.5
42	82.67	44.25	17.0	4.3	277.2	24.9	29.6	?127.8	29.6	95.4	52.0
43	82.71	44.29	17.0	1.4	246.4	26.7	65.0	175.0	20.1	25.9	66.9
44	82.66	44.26	12.0	2.4	261.0	55.0	65.1	8.5	6.9	116.4	68.6
45	82.70	44.32	5.0	1.6	261.9	51.0	?164.5	114.2	36.3	?142.6	17.3
46	82.68	44.23	11.0	2.0	260.3	48.2	57.5	?167.4	1.5	99.1	66.3
47	82.47	43.58	6.0	1.8	184.6	40.0	176.9	39.1	31.1	153.6	34.5
48	82.65	44.27	8.0	1.9	253.7	50.0	57.0	?173.6	0	96.3	65.3
49	82.94	44.33	11.0	2.0	276.2	74.8	120.8	?17.1	23.6	?139.1	50.5
50	83.32	44.28	8.0	2.1	286.4	37.2	?163.3	127.8	43.3	?114.6	26.1
51	83.35	44.28	17.0	3.8	290.0	32.7	79.0	?152.0	12.7	54.7	75.9
52	83.13	44.34	5.0	2.1	237.4	80.3	50.0	?2.7	24.2	110.5	40.9
53	82.99	44.31	6.0	1.7	278.4	45.5	103.1	179.2	0.3	?89.3	80.7
54	82.73	44.29	10.0	2.4	281.9	52.7	69.2	26.5	5.6	134.7	72.6
55	82.49	44.26	11.0	2.3	309.5	45.2	117.6	?159.7	3.1	?60.9	70.5
56	82.75	44.28	16.0	2.0	334.4	39.6	126.1	?140.7	10.4	?27.0	65.4
57	82.83	43.49	9.0	3.7	272.8	46.1	87.1	4.9	1.1	121.8	87.7
注：表中黑体数字为精河地震序列中部分 M_L＞3.0余震及其震源机制解。