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2022年1月2日宁蒗MS5.5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

李鉴林,常祖峰,万永革,黄少华,刘昌伟,刘强,王珏,阿拉塔,2023. 2022年1月2日宁蒗MS5.5地震发震构造研究. 震灾防御技术,18(3):536−547. doi:10.11899/zzfy20230310. doi: 10.11899/zzfy20230310
引用本文: 李鉴林,常祖峰,万永革,黄少华,刘昌伟,刘强,王珏,阿拉塔,2023. 2022年1月2日宁蒗MS5.5地震发震构造研究. 震灾防御技术,18(3):536−547. doi:10.11899/zzfy20230310. doi: 10.11899/zzfy20230310
Li Jianlin, Chang Zufeng, Wan Yongge, Huang Shaohua, Liu Changwei, Liu Qiang, Wang Jue, Alata. Discussion on Seismogenic Structure of Ninglang MS5.5 Earthquake on January 2, 2022[J]. Technology for Earthquake Disaster Prevention, 2023, 18(3): 536-547. doi: 10.11899/zzfy20230310
Citation: Li Jianlin, Chang Zufeng, Wan Yongge, Huang Shaohua, Liu Changwei, Liu Qiang, Wang Jue, Alata. Discussion on Seismogenic Structure of Ninglang MS5.5 Earthquake on January 2, 2022[J]. Technology for Earthquake Disaster Prevention, 2023, 18(3): 536-547. doi: 10.11899/zzfy20230310

2022年1月2日宁蒗MS5.5地震发震构造研究

doi: 10.11899/zzfy20230310
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

Discussion on Seismogenic Structure of Ninglang MS5.5 Earthquake on January 2, 2022

  • 摘要: 2022年1月2日云南省宁蒗县发生MS5.5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。
  • 图  1  震区及附近地震构造

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

    图  2  永宁断裂地貌特征

    Figure  2.  Geomorphic characteristics of Yongni fault

    图  3  嘎儿村断层剖面

    Figure  3.  Fault profile of Ga'er village

    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

    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

    图  6  第四系等厚线与钻孔联合剖面

    Figure  6.  Quaternary isopach map and borehole join profile

    图  7  竹地村地裂缝

    Figure  7.  Zhudi village ground fissure

    图  8  宁蒗MS5.5地震烈度分布

    Figure  8.  Ninglang MS5.5 earthquake intensity distribution map

    图  9  地震破坏现场调查

    Figure  9.  Site investigation of earthquake damage

    图  10  宁蒗MS5.5地震同震位移场

    Figure  10.  Coseismic displacement field of Ninglang MS5.5 earthquake

    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
    下载: 导出CSV

    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/(°)
    1183,41,−50亥姆霍兹波茨坦中心(GFZ)198.7,64.9,−26.230.330.3
    2198,63,−37郭祥云等198.7,64.9,−26.330.310.6
    3206,71,−9韩立波等198.7,64.9,−26.330.317.1
    4177,69,−71中国地震台网中心198.7,66.0,−153.795.341.3
    5196,55,−30雷兴林198.7,64.9,−26.330.310.5
    6210,73,21中国地震科学实验场
    大理中心
    198.7,64.9,−26.730.345.1
    7293,70,170赵韬300.5,66.3,−152.530.335.5
    下载: 导出CSV
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  • 收稿日期:  2022-07-12
  • 刊出日期:  2023-08-31

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