2022年1月2日宁蒗<i>M</i><sub>S</sub>5.5地震发震构造研究

李鉴林; 常祖峰; 万永革; 黄少华; 刘昌伟; 刘强; 王珏; 阿拉塔

doi:10.11899/zzfy20230310

2022年1月2日宁蒗M_S5.5地震发震构造研究

doi: 10.11899/zzfy20230310

1.
云南省地震局, 昆明 650041
2.
河北省地震动力学重点实验室, 河北三河 065201

基金项目: 云南省地震局青年基金项目（2022K02）；云南省地震局科技专项基金项目（2022ZLZX01）；国家自然科学基金（U2002211）

详细信息

作者简介:
李鉴林，男，生于1977年。硕士，工程师。主要从事活动构造及地震地质研究工作。E-mail：287763109@qq.com

通讯作者:
常祖峰，男，生于1966年。正研级高级工程师。主要从事活动构造研究。E-mail：zufch@163.com

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出版历程
- 收稿日期: 2022-07-12
- 刊出日期: 2023-08-31

Discussion on Seismogenic Structure of Ninglang M_S5.5 Earthquake on January 2, 2022

1.
Earthquake Adminstration of Yunnan Province, Kunming 650041, China
2.
Hebei Key Laboratory of Earthquake Dynamics, Sanhe 065201, Hebei, China

摘要

摘要: 2022年1月2日云南省宁蒗县发生M_S5.5地震，地震位于川滇边界处泸沽湖附近。历史上该地区曾多次发生5.5级左右的中强地震，震区构造复杂，NW向和NE向断裂展布相互交织，构成棋盘格状。据野外地质调查，震中区附近NW向永宁断裂和NE向日古鲁-岩瓦断裂具有明显的晚更新世活动迹象，同时对永宁新生代构造盆地和新生界具有明显的控制作用。根据泸沽湖西侧地质钻孔推测永宁盆地内尚发育1条与永宁断裂平行的NW向隐伏断层。地震震源机制解、同震位移场、地震烈度分布特征及地震现场破坏调查结果表明，此次地震与NW向永宁活动断裂密切相关。
- 宁蒗地震 /
- 永宁断裂 /
- 发震构造 /
- 震源机制解
Abstract: On January 2, 2022, an M_S5.5 earthquake occurred in Ninglang County, Yunnan Province, near Lugu Lake at the junction of Sichuan and Yunnan. This area has been many medium-strong earthquakes of about 5.5 magnitude in history, and is an earthquake prone area in Northwest Yunnan, The structure of the earthquake area is complex, and two groups of NW and NE faults are intertwined to form a checkerboard grid. According to the field geological survey, the NW trending Yongning fault and the NE trending Rilu Yanwa fault near the epicenter have obvious signs of late Pleistocene active faults, and have obvious control over the Cenozoic tectonic basin and the Cenozoic of Yongning. Geological drilling on the west side of Lugu Lake speculated that there is still a NW hidden fautl parallel to the Yongning fault in the Yongning Basin. According to the analysis of the seismic source mechanism solution, the coseismic displacement field, the distribution characteristics of the seismic intensity and the results of the earthquake site destruction survey, it is believed that the earthquake is closely related to the Yongning active fault in the NW direction.
- Ninglang earthquake /
- Yongning fault /
- Seismogenic structure /
- Focal mechanism

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图 1 震区及附近地震构造

Figure 1. Map of seismic in and around the earthquake zone

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图 2 永宁断裂地貌特征

Figure 2. Geomorphic characteristics of Yongni fault

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图 3 嘎儿村断层剖面

Figure 3. Fault profile of Ga'er village

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图 4 岩瓦NNE向1.2 km公路旁断层剖面

Figure 4. Cross section of the fault beside road,1.2 km NNE of Yanwa village

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图 5 泸沽湖西侧钻孔分布与岩芯

Figure 5. Borehole distrbution and photograph beside the west of Lugu lake

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图 6 第四系等厚线与钻孔联合剖面

Figure 6. Quaternary isopach map and borehole join profile

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图 7 竹地村地裂缝

Figure 7. Zhudi village ground fissure

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图 8 宁蒗M_S5.5地震烈度分布

Figure 8. Ninglang M_S5.5 earthquake intensity distribution map

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图 9 地震破坏现场调查

Figure 9. Site investigation of earthquake damage

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图 10 宁蒗M_S5.5地震同震位移场

Figure 10. Coseismic displacement field of Ninglang M_S5.5 earthquake

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表 1 钻孔主要地层

Table 1. Main stratum of borehone

地层名称	地层特征
坡积层	褐黄、褐红、褐灰色，结构松散，黏性土为主，山麓斜坡地带含碎石、砾石，表层有植物根系
淤泥层	深灰色，软塑，湿。土质软，表现为高压缩性、强黏着感，层中含少量有机质，偶夹粉土薄层，为沼泽沉积相
泥炭土	灰黑色，可塑，湿。土层中含大量有机质、腐殖质，质轻，易压缩，韧性差，夹灰、黄灰色可塑黏土层，为湖积沉积相
碎石土层	褐黄色，中密，饱和。砾石含量约35%，分布不均匀，大量黏性土和角砾充填，为残积相
玄武岩	深灰色，岩芯裂隙发育，岩质坚硬，钻进困难。岩芯表现为破碎，多呈碎石、碎块状，上部局部地带有全风化残积层分布

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表 2 不同机构给出的震源机制解得到的中心震源机制解标准差

Table 2. Standard deviation of central focal mechanism solution obtained from focal mechanism solutions given by different mechanisms

序号	震源机制解走向、倾角和滑动角/（°）	机构或作者	作为初始解得到的中心震源机制解走向、倾角和滑动角/（°）	作为初始解得到的标准差S/（°）	震源机制解与其他机构震源机制解的最小空间旋转角/（°）
1	183，41，−50	亥姆霍兹波茨坦中心（GFZ）	198.7，64.9，−26.2	30.3	30.3
2	198，63，−37	郭祥云等	198.7，64.9，−26.3	30.3	10.6
3	206，71，−9	韩立波等	198.7，64.9，−26.3	30.3	17.1
4	177，69，−71	中国地震台网中心	198.7，66.0，−153.7	95.3	41.3
5	196，55，−30	雷兴林	198.7，64.9，−26.3	30.3	10.5
6	210，73，21	中国地震科学实验场大理中心	198.7，64.9，−26.7	30.3	45.1
7	293，70，170	赵韬	300.5，66.3，−152.5	30.3	35.5

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