2006年文安5.1级地震的烈度异常区初探
|
摘要
2006年7月4日河北省文安县发生的5.1级地震是1998年1月10日张北6.2级地震后首都圈内最大的一次地震。该震震中烈度偏低,而远在100km以外的北京等地区却出现较高的烈度异常。本文根据首都圈数字强震台网及其烈度速报系统测定的地震动强度等值线图,对该地震的烈度异常情况进行了分析,并对首都圈内3个烈度异常区的成因进行了初步的分析。结合震源的发震机理、地质结构和地震波射线路径等,分析了造成该次地震震中低烈度、小灾情,而外围烈度较高的基本因素。
An earthquake measuring M5.1 on the Richter scale has struck Wen'an County,Hebei Province on July 4,2006.No casualties have been reported,there was just slight damage.The disaster conditions of this time is the lightest on the record tally from 4.9～5.1 since the CCDSN(China Center of Digital Seismic Network)was build in 1999.The epicenter intensity of this earthquake was not strong,while in areas like Beijing which is 100km far away,there appeared abnormal high intensity.This article discusses the reasons behind this strange phenomenon,with the diagrams of intensity isolines drawn by the Capital Zone Strong Motion Observation Center as reference,as well as the mechanism of earthshaking in the epicenter,and the seismic histories,geological structure and ways of spreading of the seismic waves in areas 150 km around the epicenter.And it is concluded that the special dynamic and geological situations were the main causes of the strange phenomenon of low intensity degree in epicenter,slight damages,yet high intensity in the surrounding areas.
An earthquake measuring M5.1 on the Richter scale has struck Wen'an County,Hebei Province on July 4,2006.No casualties have been reported,there was just slight damage.The disaster conditions of this time is the lightest on the record tally from 4.9～5.1 since the CCDSN(China Center of Digital Seismic Network)was build in 1999.The epicenter intensity of this earthquake was not strong,while in areas like Beijing which is 100km far away,there appeared abnormal high intensity.This article discusses the reasons behind this strange phenomenon,with the diagrams of intensity isolines drawn by the Capital Zone Strong Motion Observation Center as reference,as well as the mechanism of earthshaking in the epicenter,and the seismic histories,geological structure and ways of spreading of the seismic waves in areas 150 km around the epicenter.And it is concluded that the special dynamic and geological situations were the main causes of the strange phenomenon of low intensity degree in epicenter,slight damages,yet high intensity in the surrounding areas.
引文
[1]张素灵,2003,首都圈烈度速报系统及对较强有感地震的速报,北京海淀首届城市防震减灾(国际)论坛论文集。
[2]袁一凡,1998,由地震动三要素确定地震动强度(烈度)的研究,国家地震局工程力学研究所研究报告。
刁桂苓、张四昌、孙佩卿等,2006,2006年7月4日文安5.1级地震,地震地质,28(3),497～502。
嘉世旭、齐诚、王夫运等,2005,首都圈地壳网格化三维结构,地球物理学报,48(6),1316～1324。
刘爱文、常宝林、李雨生等,2006,2006年7月4日河北省文安5.1级地震震害分析,震灾防御技术,1(3),278～282。
马杏垣主编,1989,中国岩石圈动力学地图集(国家地震局中国岩石圈动力学地图集编委会编纂),30,北京:中国地图出版社。
任志林、白立新、杨建思等,2006,河北文安地震与云南盐津地震震害比较分析,国际地震动态,(8),30～35。
王若柏、杨国华、耿士昌等,1994,北京地区地壳形变场及其动态特征,地震地质,16(1),1～9。
谢小碧,1999,地震波在盆地中的传播特点及其对盆地中震害的影响,山西地震,(1),1～5。
修济刚、黄键发、侯建盛,2006,河北文安5.1级地震应急工作总结,国际地震动态,(8),22～24。
杨建思、徐志强、姜旭东等,2006,文安地震现场观测与思考,国际地震动态,(8),25～29。
赵永,王斌,孟玉梅,2001,中国数字化地震观测系统,国际地震动态,(6),1～8。
[2]袁一凡,1998,由地震动三要素确定地震动强度(烈度)的研究,国家地震局工程力学研究所研究报告。
刁桂苓、张四昌、孙佩卿等,2006,2006年7月4日文安5.1级地震,地震地质,28(3),497～502。
嘉世旭、齐诚、王夫运等,2005,首都圈地壳网格化三维结构,地球物理学报,48(6),1316～1324。
刘爱文、常宝林、李雨生等,2006,2006年7月4日河北省文安5.1级地震震害分析,震灾防御技术,1(3),278～282。
马杏垣主编,1989,中国岩石圈动力学地图集(国家地震局中国岩石圈动力学地图集编委会编纂),30,北京:中国地图出版社。
任志林、白立新、杨建思等,2006,河北文安地震与云南盐津地震震害比较分析,国际地震动态,(8),30～35。
王若柏、杨国华、耿士昌等,1994,北京地区地壳形变场及其动态特征,地震地质,16(1),1～9。
谢小碧,1999,地震波在盆地中的传播特点及其对盆地中震害的影响,山西地震,(1),1～5。
修济刚、黄键发、侯建盛,2006,河北文安5.1级地震应急工作总结,国际地震动态,(8),22～24。
杨建思、徐志强、姜旭东等,2006,文安地震现场观测与思考,国际地震动态,(8),25～29。
赵永,王斌,孟玉梅,2001,中国数字化地震观测系统,国际地震动态,(6),1～8。
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心