2021年5月21日漾濞4次MS≥5.0地震前后b值变化

曾宪伟 赵小艳 李蒙亚 李文君 唐浩 袁媛

曾宪伟,赵小艳,李蒙亚,李文君,唐浩,袁媛. 2022. 2021年5月21日漾濞4次MS≥5.0地震前后b值变化. 地震学报,44(3):401−412 doi: 10.11939/jass.20210129
引用本文: 曾宪伟,赵小艳,李蒙亚,李文君,唐浩,袁媛. 2022. 2021年5月21日漾濞4次MS≥5.0地震前后b值变化. 地震学报,44(3):401−412 doi: 10.11939/jass.20210129
Zeng X W,Zhao X Y,Li M Y,Li W J,Tang H,Yuan Y. 2022. Variation of b-value before and after Yangbi four MS≥5.0 earthquakes on May 21,2021. Acta Seismologica Sinica,44(3):401−412 doi: 10.11939/jass.20210129
Citation: Zeng X W,Zhao X Y,Li M Y,Li W J,Tang H,Yuan Y. 2022. Variation of b-value before and after Yangbi four MS≥5.0 earthquakes on May 21,2021. Acta Seismologica Sinica44(3):401−412 doi: 10.11939/jass.20210129

2021年5月21日漾濞4次MS≥5.0地震前后b值变化

doi: 10.11939/jass.20210129
基金项目: 地震科技星火计划(XH21040,XH18053Y)、宁夏重点研发计划重大项目(2018BFG02011)和强震危险性研究创新团队(CX2019-4)联合资助
详细信息
    通讯作者:

    曾宪伟,硕士,高级工程师,主要从事地震活动性分析和小震定位及震源机制方面的相关研究,e-mail:zeng_xw@126.com

  • 中图分类号: P315.75

Variation of b-value before and after Yangbi four MS≥5.0 earthquakes on May 21,2021

  • 摘要: 2021年5月21日21时21分至22时31分,云南大理州漾濞县接连发生4次MS≥5.0地震,分别为MS5.6,MS6.4,MS5.0和MS5.2地震。选取2015年1月1日至2021年6月4日漾濞地震震源区及其附近区域记录的地震资料,利用极大似然法计算研究区b值,通过分析漾濞地震前后不同时段的b值空间分布特征,得到以下主要认识:① 漾濞震群发生后,震源区b值出现快速下降,可能预示着局部地壳介质强度接近临界状态;② 漾濞4次MS≥5.0地震均沿剖面低b值异常区的边缘分布;③ 漾濞地震发生后,震源区b值明显回升,预示着地壳应力得到释放,短期强震危险性降低;④ 漾濞地震西北40 km和70 km处存在低b值异常区,未来存在发生中强地震的风险。

     

  • 图  1  2015年1月1日至2021年6月4日研究区震中分布

    Figure  1.  Distribution of epicenters from January 1,2015 to June 4,2021 in the studied area

    图  2  研究区ML≥0.0地震M-t图(a)和震级频次图(b)

    Figure  2.  M-t (a) and magnitude-frequency (b) diagrams of the ML≥0.0 earthquakes from January 1,2015 to June 4,2021 in the studied area

    图  3  研究区ML≥1.5地震密度分布图

    Figure  3.  Distribution of seismic density with ML≥1.5 for the studied area

    图  4  研究区最小完整性震级Mc的空间分布

    Figure  4.  Spatial distribution of minimum complete magnitude Mc

    图  5  b值空间扫描时不同扫描半径所占节点数的比例

    Figure  5.  Proportion of nodes with different search during b value space scanning

    图  6  b值及标准差随截止震级的变化

    Figure  6.  b-value and its standard deviation changes with cut-off magnitude

    图  7  研究区地震震级-频度关系曲线(2015年1月1日—2021年6月4日)

    Figure  7.  Magnitude-frequency curve of earth-quakes from January 1,2015 to June 4,2021 in the studied area

    图  8  研究区不同时段b值空间分布

    Figure  8.  Spatial distribution of b-value in different periods in the studied area

    ① 2016-05-18 00:48 MS5.0;② 2017-03-27 07:55 MS5.2;③ 2021-05-21 21:21 MS5.6; ④ 2021-05-21 21:48 MS6.4;⑤ 2021-05-21 21:55 MS5.0;⑥ 2021-05-21 22:31 MS5.2 (a) 2015-01-01—2021-05-17;(b) 2015-01-01—2021-05-21 21:00;(c) 2015-01-01—2021-06-04

    图  9  研究区b值空间变化图(数字编号代表的地震与图8相同,下同)

    Figure  9.  Spatial distribution of b-value variation (The numbers present the same earthquakes as in Fig. 8

    (a) 2015-01-01—2021-05-21 21:00 vs 2015-01-01—2021-05-17; (b) 2015-01-01—2021-06-04 vs 2015-01-01—2021-05-21 21:00

    图  10  沿断裂方向的地震深度剖面图(a)和b值剖面分布图(b)(地震资料时段为2015-01-01—2021-05-21 21:00)

    Figure  10.  Depth profile (a) and b-value profile (b) along the fault (The seismic data is recorded from January 1,2015 to 21:00,May 21,2021)

    图  11  研究区②号地震前(a)与①号地震前(b)的b值空间分布

    Figure  11.  Spatial distribution of b-value before earthquake ② (a) and earthquake ① (b) in the studied area

    (a) 2015-01-01—2016-05-17;(b) 2015-01-01—2017-03-26

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出版历程
  • 收稿日期:  2021-07-29
  • 修回日期:  2021-10-25
  • 网络出版日期:  2022-04-11
  • 刊出日期:  2022-06-27

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