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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,2018,13(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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