|本期目录/Table of Contents|

[1]曾宪伟,李文君,马翀之,等.基于b值分析宁夏吴忠—灵武地区强震危险性*[J].地震研究,2021,44(01):41-48.
　ZENG Xianwei,LI Wenjun,MA Chongzhi,et al.Strong Earthquake Risk in Wuzhong-Lingwu Region of Ningxia Based on b-value[J].Journal of Seismological Research,2021,44(01):41-48.
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基于b值分析宁夏吴忠—灵武地区强震危险性*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
44
期数:
2021年01期
页码:
41-48
栏目:
出版日期:
2021-01-15

文章信息/Info

Title:
Strong Earthquake Risk in Wuzhong-Lingwu Region of Ningxia Based on b-value
作者:
曾宪伟; 李文君; 马翀之; 蔡新华
(宁夏回族自治区地震局,宁夏 银川 750001)
Author(s):
ZENG Xianwei; LI Wenjun; MA Chongzhi; CAI Xinhua
(Ningxia Hui Autonomous Region Earthquake Agency,Yinchuan 750001,Ningxia,China)
关键词:
吴忠—灵武地区;  b值;  极大似然法;  地震危险性;  小震稀疏段
Keywords:
Wuzhong-Lingwu region;  b-value;  the maximum likelihood method;  seismic risk;  sparse segment of small earthquakes
分类号:
P315.75
DOI:
-
摘要:
利用1970年1月至2018年10月吴忠—灵武地区的地震精定位目录,基于b值平面分布以及沿活动断裂的震源深度剖面和b值剖面图等,分析了研究区发生强震的潜在危险性。结果表明:①新华桥附近存在发生地震的潜在危险性,强度为MS5.1～5.4,但b值时序曲线表明该区域短期内发生中强地震的紧迫性不强; ②吴忠/郭家桥—高闸地区很可能是1921年2月22日吴忠南MS6.0地震的发震位置,该地震震源深度应在15 km左右,上地壳浅部很可能未破裂; ③吴忠/郭家桥—高闸地区地壳浅部依旧存在发生强震的危险,孕震强度为MS6.2～6.3,孕震深度在10 km以内。
Abstract:
In the paper,we relocated the earthquakes in Wuzhong-Lingwu region from Jan.,1970 to Oct.,2018 based on Hypo2000 and HypoDD methods.Then,analyzing the horizontal distribution of b-value,focal depth profile and b-value profile along active fault,we studied the potential risk of strong earthquakes in the study region.The results show that:① There is a risk of MS5.1～5.4 earthquakes near Xinhuqiao area.However,the b-value time series curve does not support the occurrence of medium-strong earthquakes in the region in a short time.② The Wuzhong MS6.0 earthquake on Feb.22,1921 is likely to occur in Wuzhong-Gaozha region.The focal depth of the earthquake is about 15 km,and the shallow part of the upper crust is probably unbroken.③ There is still a risk of strong earthquakes with MS6.2～6.3 in the shallow crust of the Wuzhong-Gaozha region and the focal depth is within 10 km.

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备注/Memo

备注/Memo:
收稿日期:2019-11-28
基金项目:地震科技星火计划项目(XH21040)、宁夏自然科学基金项目(NZ17221)、地震科技星火计划项目(XH18053Y)、强震危险性研究创新团队(CX2019-4)和国家自然科学基金(41604015)联合资助.
更新日期/Last Update: 2021-01-15