Relocation and seismogenic structure analysis of the MS5.5 Ninglang earthquake sequence on January 2，2022
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摘要: 2022年1月2日云南省丽江市宁蒗县发生MS5.5地震。采用地震编目系统提供的此次地震的震相到时数据，使用双差定位方法对此次宁蒗MS5.5地震序列进行重新定位，获得了694次地震的高精度相对位置。重定位后的地震空间分布显示：此次地震序列呈NNE至近NS向分布，与震源机制解的节面Ⅱ走向（191°）一致，主震位于地震序列南段；地震序列主体活动区长约11 km，宽约6 km，余震主要分布在4—11 km的深度范围内；地震序列在深度剖面上呈现出两组倾向不同的活动分支，其中东侧分支与震源机制解节面Ⅱ的倾角（81°）一致。此外，本次地震还可能触发了邻区的局部断裂活动。综合分析认为，2022年宁蒗MS5.5地震的发震构造应该是NNE至近NS向兼具正断层分量的左旋走滑断层，倾向为WNW，倾角约为81°，其活动性质与震源区已知的活动断层均不一致。尽管本次宁蒗MS5.5地震序列发生在2012年宁蒗—盐源MS5.7地震序列的北侧，但是两次地震序列的发震断层并不相同。库仑应力反演结果显示，2012年宁蒗—盐源MS5.7地震对本次宁蒗MS5.5地震的发生具有促进作用。
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关键词:
- 2022年宁蒗MS5.5地震 /
- 2012年宁蒗—盐源MS5.7地震 /
- 双差定位法 /
- 永宁断裂 /
- 日古鲁—岩瓦断裂
Abstract: On January 2, 2022, a MS5.5 earthquake occurred in the Ninglang County, Lijiang City, Yunnan Province. Using the P and S phase arrival data of this MS5.5 earthquake provided by the Seismic Catalogue System, the high-precision relative positions of 694 earthquakes in Ninglang MS5.5 earthquake sequence are obtained by using the double difference relocation algorithm. In general, the relocations reveal a 11 km-long, linear NNE−NS seismicity trend concentrating in the 4—11 km depth range, which is consistent with the NNE nodal plane （191°） of the mainshock focal mechanism solution. The mainshock is located in the southern segment of the earthquake sequence. The earthquake sequence shows two groups of active branches with different tendencies on the depth profiles, in which the east branch is consistent with the dip angle of the nodal plane Ⅱ （81°） of the mainshock focal mechanism solution. In addition, the earthquake may have triggered local fault activity in the adjacent area. According to the comprehensive analysis, the seismogenic structure of the MS5.5 Ninglang earthquake sequence should be a NNE−NS trending left-lateral strike-slip fault, with normal component, and the fault plane dips to the WNW at 81° angle. The properties of the seismogenic fault are not completely consistent with any mapped faults in this area. Although the MS5.5 Ninglang earthquake sequence is located to the north of the MS5.7 Ninglang-Yanyuan earthquake sequence in 2012, they have different seismogenic structures. The result of Coulomb failure stress shows that the MS5.7 Ninglang-Yanyuan earthquake in 2012 promoted the occurrence of the MS5.5 Ninglang earthquake. -
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图 6 2012年宁蒗—盐源MS5.7 和2022年宁蒗MS5.5的地震序列重定位空间分布
（a） 震中分布；（b−e） 深度剖面
Figure 6. Spatial distribution of the MS5.7 Ninglang-Yanyuan earthquake sequence in 2012 and the MS5.5 Ninglang earthquake sequence in 2022 after relocation
（a） Epicenter distribution；（b−e） Depth profiles
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图 1 宁蒗MS5.5地震震源区周边历史地震和断裂分布及研究区构造背景
F1：德钦—中甸—大具断裂；F2：丽江—大具断裂；F3：丽江—小金河断裂；F4：程海断裂；F5：宁蒗断裂；F6：盐源—棉垭断裂；F7：博科—木里断裂；F8：日古鲁—岩瓦断裂；F9：永宁断裂。构造数据引自邓起东（2007）和常祖峰等（2013）；地形起伏数据为SRTM15+ ，引自Tozer等（2019）
Figure 1. Distribution of historical earthquakes and faults around the focal area of the MS5.5 Ninglang earthquake
F1：Deqin-Zhongdian-Daju fault；F2：Lijiang-Daju fault；F3：Lijiang-Xiaojinhe fault；F4：Chenghai fault；F5：Ninglang fault；F6：Yanyuan-Mianya fault；F7：Boke-Muli fault；F8：Rigulu-Yanwa fault；F9：Yongning fault. Geological data is cited from Deng （2007） and Chang et al （2013）；topographic relief data is RTM15+ ，from Tozer et al （2019）
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图 2 宁蒗MS5.5地震震源区地质构造（引自薛代福，1980，安晓文和常祖峰，2018）
F1：温泉断层；F2：永宁断层；F3：阿拉凹断层；F4：格瓦叶口断层；F5：马家坪断层；F6：安家村断裂；F7：广西山断裂
Figure 2. Geological structure of the source region of MS5.5 Ninglang earthquake focal area （after Xue，1980；An and Chang，2018）
F1：Wenquan fault；F2：Yongning fualt；F3：Ala’ao fault；F4：Gewayekou fault；F5：Majiaping fault； F6：Anjiacun fault；F7：Guangxishan fault
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图 3 宁蒗MS5.5地震震中周边的台站分布
Figure 3. Distribution of stations around the epicenter of the MS5.5 Ninglang earthquake
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图 4 2022宁蒗MS5.5地震序列M-t图
Figure 4. Magnitude-time distribution of the MS5.5 Ninglang earthquake sequence
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图 5 2022年宁蒗MS5.5地震序列重定位在空间分布
（a） 震中分布；（b−e） 深度剖面
Figure 5. Spatial distribution of the MS5.5 Ninglang earthquake sequence and in 2022 after relocation
（a） Epicenter distribution；（b−e） Depth profiles
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图 7 2022年宁蒗MS5.7地震引起的库仑剪应力变化及该地震与2012年MS5.5地震发震断层间的运动学关系
Figure 7. Change of Coulomb failure stress caused by the MS5.7 Ninglang earthquake and kinematic relationship between seismogenic faults of the MS5.7 earthquake in 2022 and the MS5.5 earthquake in 2012
表 1 宁蒗地区速度模型（引自王光明等，2015）
Table 1 Velocity model of Ninglang area （after Wang et al，2015）
层序号 每层厚度/km vP/（km·s−1） vS/（km·s−1） 1 1.0 4.60 2.659 2 10.0 6.35 3.671 3 14.0 6.40 3.699 4 10.5 6.55 3.786 5 20.5 7.45 4.306 6 18.0 8.15 4.711 7 − 8.50 4.913 
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表 2 2012年宁蒗—盐源MS5.7和2022年宁蒗MS5.5地震的震源机制解（引自USGS，2022）
Table 2 Focal mechanism solutions of the MS5.7 Ninglang-Yanyuan earthquake in 2012 and the MS5.5 Ninglang earthquake in 2022 （from USGS，2022）
发震日期 MW 震源深度/km 节面Ⅰ 节面Ⅱ 走向/° 倾角/° 滑动角/° 走向/° 倾角/° 滑动角/° 2012-06-24 5.5 13.0 335 30 −92 158 60 −89 2022-01-02 5.4 40.5 293 35 −165 191 81 −56
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