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  段美芳,陆丽娜,李莹甄,李宝君,杨明,贾建鹏.张家口-渤海断裂带西段及中西段b值时空扫描[J].震灾防御技术,2018,(1):138-148, DOI:10.11899/zzfy20180112.

张家口-渤海断裂带西段及中西段b值时空扫描
摘要:    张家口-渤海断裂带作为华北平原地区重要的活动断裂带,地震活动频繁,是我国地震监测预测重点区域之一。本文选取该断裂带西段及中西段1970-2016年的地震目录,采用最大似然法进行时间扫描,分析显示研究区b值为0.28-1.52,其随时间变化的特点是在大地震发生前降至最低,震后逐渐恢复;研究区空间扫描结果显示,该区b值的平均值为0.93,其中怀安-万全盆地北缘断裂和蓟运河断裂平均b值较低,反映该区域应力水平较高。综合以上结果,本次研究揭示出研究区地震危险性的时间和空间差异,为对研究区地震危险性评价提供基础数据。
作者单位
段美芳 防灾科技学院, 河北三河 065201;云南省地震局洱源地震台, 云南洱源 671200 
陆丽娜 防灾科技学院, 河北三河 065201 
李莹甄 防灾科技学院, 河北三河 065201 
李宝君 辽宁金州地震台, 辽宁大连 116100 
杨明 防灾科技学院, 河北三河 065201;中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029 
贾建鹏 防灾科技学院, 河北三河 065201 
关  键  词:b  张渤断裂带西段及中西段  地震危险性
DOI:10.11899/zzfy20180112
基金项目:防灾科技学院教研教改项目(JY2016A01)资助
收稿日期:2016-12-27
作者简介:段美芳,女,生于1994年。本科生。主要研究方向:地震地质学。E-mail:lulina@cidp.edu.cn
通讯作者:陆丽娜,女,生于1983年。博士,讲师。主要从事矿床学和地震地质的教科研工作。E-mail:lulina@cidp.edu.cn
The Spatial and Temporal Scanning of the b-value in the Western and Mid-western Section of the Zhangjiakou-Bohai Fault Belt
Abstract:      The Zhangjiakou-Bohai fault belt, as one of the important active faults in North China, as well as earthquake-prone area, becomes one of the crucial region to monitor the earthquake activities in China. In this paper we select the western and mid-western section of the Zhangjiakou-Bohai fault belt as the study region, and apply the maximum likelihood as calculating method to conduct analysis of earthquake catalogue during 1970-2016. The temporal analyses indicate that the seismic b-value ranges from 0.28 to 1.52 and drops to the lowest before the great earthquake and gradually recovers after the earthquake. The spatial analyses illustrate that the b-value shows 0.93 in average, and that in the lower average b-value region, such as north rim fault of the Huai'an-Wanquan basin and Jiyunhe fault shows stronger regional stress level. The spatiotemporal characteristic analyses of the b-value, indicates that the degree of seismic risk varies in time and space in the study area. Our results provide basic data for seismic hazard assessment for the Zhangjiakou-Bohai fault belt.
Keywords:  b-value  The western and mid-western section of the Zhang-Bo fault belt  Seismic hazard
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