青海玛多MS7.4地震前b值时空变化特征

杜航; 杨云; 郑江蓉; 王俊; 张扬; 宫杰

doi:10.11899/zzfy20220409

青海玛多M_S7.4地震前b值时空变化特征

doi: 10.11899/zzfy20220409

江苏省地震局, 南京 210014

基金项目: 江苏省地震局青年科学基金（202102）；地震预测开放基金（XH22033D）；江苏省地震局科技创新团队（202204）

详细信息

作者简介:
杜航，男，生于1991年。工程师。主要从事地震监测、预报等方面研究。E-mail：duh@mail.ustc.edu.cn

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出版历程
- 收稿日期: 2021-11-08
- 刊出日期: 2022-12-31

Temporal and Spatial Variation of b-value before Maduo M_S7.4 Earthquake

Jiangsu Earthquake Agency, Nanjing 210014, China

摘要

摘要: 大量研究表明地震孕育过程中存在相对平静期，该阶段b值会相对下降，b值变化在地震活动性研究中起着十分重要的作用。2021年5月22日青海玛多发生M_S7.4地震，为研究地震前b值时空变化特征，本文截取2009年至震前地震目录，将地震目录分为去除余震目录、完整地震目录，对比研究b值变化特征。研究发现，玛多M_S7.4地震前1年b值开始低于均值且不断下降，至b值有上升趋势时地震发生，扩大到区域内其它5级以上地震，也符合此规律，地震发生后b值明显上升，短时间内又下降至较低位置，并一直处于较低位置直至下次地震发生；从b值空间扫描结果看，玛多M_S7.4地震前，震中位于低b值区域，该位置为b值最低处；通过不同时间段的b值空间扫描结果，可发现玛多M_S7.4地震发生前低b值区域向震中不断迁移，表明地震发生前震中附近应力不断集中；b值空间扫描时，完整地震目录掩盖了中强震震中区域低b值特性，去余震地震目录较好的凸显了中强震震中区域低b值特性。
- 玛多M_S7.4地震 /
- b值 /
- 时空扫描 /
- 地震目录
Abstract: A large number of studies have shown that there is a corresponding quiet period in the gestation process of an earthquake, during which the b-value will decrease accordingly, and the change of b-value plays a very important role in the study of seismic activity. M_S7.4 earthquakes occurred in Maduo County, Qinghai Province on May 22, 2021. To study the relationship between the spatiotemporal changes of b-value before the earthquake, the earthquake catalog from 2009 to before the earthquakesis extracted to study the changes of b-value in the earthquake focal area. The results show that the b-values of this earthquake in the focal area of earthquake with a magnitude of more than 5 decreased correspondingly about half a year before the earthquake, while the b-value rises suddenly and then decreases rapidly before the earthquake, and the earthquake mostly occurs in the descending stage. In this paper, short-term spatiotemporal scanning was carried out for two earthquakes above M5 in the focal area, and the epicenters were all located in low b-value region. This study found that short-term changes in b-values seem to be related to earthquakes. The epicenters of moderate and strong earthquakes in the study area are all located in low b-value areas. Further research is needed to determine whether this feature is universal or not, and ultimately to find the best earthquake prediction method.
- Maduo M_S7.4 earthquake /
- b-value /
- Short space-temporal scanning /
- Earthquake catalogue

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图 1 青藏高原主要活动断裂及历史地震分布

Figure 1. Simplified distribution of main active faults and historic earthquakes in the Qinghai-Tibet plateau

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图 2 研究区域中强震（M_S≥5.0）及玛多地震余震（M_L≥3.0）分布图

Figure 2. Simplified distribution of major earthquake（M_S≥5.0）and Maduo earthquake aftershocks（M_L≥3.0）in the study area

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图 3 研究区域2009年1月1日—2021年4月30日震级-频次图

Figure 3. The frequency-magnitude distribution of earthquakes in the study area during January, 2009—April, 2021

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图 4 b值时间曲线

Figure 4. The temporal variation of b value

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图 5 去余震目录b值空间分布图像

Figure 5. Spatial distribution of b value with deleting aftershock

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图 6 完整目录b值空间分布图像

Figure 6. Spatial distribution of b value without deleting aftershock

下载: 全尺寸图片幻灯片

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