2003年内蒙古巴林左旗—阿鲁科尔沁旗5.9级地震测震学指标异常分析
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摘要
2003年8月16日,在内蒙古巴林左旗与阿鲁科尔沁旗交界处发生MS5.9地震。以本次地震为研究对象,结合震中区地震地质背景,从地震活动性和震害分布特征两个方面进行了分析。根据b值、波速比(VP/VS)和地震空间相关长度在震前的变化,探讨了地震前震源区地下介质体的演变过程,并对此次地震的孕震过程做出了初步推断。本次地震前波速比和地震空间相关长度的变化规律对该区域未来中强地震预测有一定借鉴意义。
On August 16,2003,an MS5.9 earthquake occurred in the bordering area of Balinzuoqi and Alukeerqinqi,Inner Mongolia Autonomous Region.We analyze the seismic activity and the distribution of earthquake disaster on the basis of the seismological settings in the earthquake area.By analyzing the variation of b-value,velocity ratio(VP/VS)and correlation length before the earthquake event,we discuss the evolvement of underground media in the hypocentral area before earthquake event and preliminarily deduce the seismogenic process of the earthquake.The variation regularity of these three indexes can serve for forecasting the future medium-and strong-earthquakes in this region.
On August 16,2003,an MS5.9 earthquake occurred in the bordering area of Balinzuoqi and Alukeerqinqi,Inner Mongolia Autonomous Region.We analyze the seismic activity and the distribution of earthquake disaster on the basis of the seismological settings in the earthquake area.By analyzing the variation of b-value,velocity ratio(VP/VS)and correlation length before the earthquake event,we discuss the evolvement of underground media in the hypocentral area before earthquake event and preliminarily deduce the seismogenic process of the earthquake.The variation regularity of these three indexes can serve for forecasting the future medium-and strong-earthquakes in this region.
引文
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傅征祥.1997.中国大陆地震活动性力学研究[M].北京:地震出版社.
高孟潭,许力生.2005.2003年8月内蒙古MS5.9级地震的震害分布特征及其成因分析[J].地震学报,27(2):205-212.
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韩晓明,荣代潞.2007.2004年6月甘肃临泽震群前的地震学参数变化研究[J].高原地震,18(3):1-7.
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荣代潞,李亚荣,韩晓明.2006.地壳介质破裂的尺度理论在研究山丹—民乐6.1级地震地震学前兆特征中的应用[J].地震学报,28(4):438-447.
尹祥础,李世愚,李红,等.1987,从断裂力学观上探讨b值的物理实质[J].地震学报,9(4):364-374.
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M o gi K.1962.Study of thd elastic shocks caused by thd fracture of heter-ogeneous materials and its relation to earthquake phenomena[J].Bull.Earthquakes Res.Inst.Univ.of Tokyo,40:125-173.
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Zo ller G,Hainzl S,Kurths J.2001.Observation of growing correlationlength as an indicator for critical point behavior prior to large earth-quakes[J].JGR,106(2):2167-2175.
蔡静观,梅世蓉,张喜铃,等.1999.从高波速比试论云南丽江7级地震的孕震模式[J].地震研究,22(2):122-129.
陈立强,张跃刚.2006.2003年内蒙巴林左旗—阿鲁科尔沁旗5.9级地震及其前兆异常分析[J].华北地震科学,4(1):43-46.
傅征祥.1997.中国大陆地震活动性力学研究[M].北京:地震出版社.
高孟潭,许力生.2005.2003年8月内蒙古MS5.9级地震的震害分布特征及其成因分析[J].地震学报,27(2):205-212.
国家地震局预测预防司.1997.测震学分析预报方法[M].北京:地震出版社.
韩晓明,荣代潞.2007.2004年6月甘肃临泽震群前的地震学参数变化研究[J].高原地震,18(3):1-7.
李永莉,毛慧玲,赵小艳,等.2008.云南地区数字地震波波速比的区域特征[J].地震研究,31(3):203-208.
荣代潞,李亚荣,韩晓明.2006.地壳介质破裂的尺度理论在研究山丹—民乐6.1级地震地震学前兆特征中的应用[J].地震学报,28(4):438-447.
尹祥础,李世愚,李红,等.1987,从断裂力学观上探讨b值的物理实质[J].地震学报,9(4):364-374.
赵根模.1981.我国板内大地震之间的一种联系—诱发作用[J].地震研究,4(3):253-265.
B ru ce A,Wallace D.1989.Critical point phenomena:universal physics atlarge length scales.in the NewPhysics[M].Cambridge Univ.Press,New York,236-267.
Fro hlich C,Davis D.1990.Single-link cluster analysis as a method to e-valuate spatial and temporal properties of earthquake catalogues[J].Geophys J Int,100:19-32.
M o gi K.1962.Study of thd elastic shocks caused by thd fracture of heter-ogeneous materials and its relation to earthquake phenomena[J].Bull.Earthquakes Res.Inst.Univ.of Tokyo,40:125-173.
Sch olz C H.1968.The frequency-magnitude relation of microfracturing inrock and its relation to earthquakes[J].BSSA,58:399-415.
Zo ller G,Hainzl S,Kurths J.2001.Observation of growing correlationlength as an indicator for critical point behavior prior to large earth-quakes[J].JGR,106(2):2167-2175.
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