2003年10月25日甘肃省民乐-山丹MS6.1地震强震近场记录和分析  

STRONG MOTION RECORDS AND PRELIMINARY ANALYSIS FOR MINLE-SHANDAN M_S6.1 EARTHQUAKE ON OCT.25,2003,GANSU PROVINCE

作　　者：闵祥仪[1] 姚凯[1] 何新社[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《西北地震学报》2003年第4期289-292,318,共5页Northwestern Seismological Journal

摘　　要：2003年10月25日甘肃民乐-山丹间发生MS6.1地震.震前在兰州地震研究所明确的预报意见指导下就派出4台数字流动强震仪到甘肃省河西地区进行流动观测,其中民乐流动台获得近场主震记录.震中距为12.6km,EW向加速度峰值为331cm/s2,NS向加速度峰值为332cm/s2,垂直向加速度峰值为209cm/s2.其它固定自由场数字强震台山丹、肃南、武威也获得记录.本文分析了近场主震频谱以及远场加速度衰减规律.Minle-Shandan M_S6.1 earthquake occurred on Oct.25,2003.in west of Gansu province. Just before the earthquake 4 digital mobile strong motion instruments were erected in Hexi region, near the epicenter,by Lanzhou Institute of Seismology, according to the definite prediction opinion of the Institute. One instrument of them in Minle mobile station obtained the near-field strong motion seismic record of main shock. The distance to epicenter is 12.6 km . The maximum acceleration on direct EW is 331 cm/s^(2);on NS is 332 cm/s^(2)and on UD is 209 cm/s^(2). Furthermore some immobile strong motion stations in Hexi region (Shandan ,Sunan and Wuwei) also obtained this event . In the paper the observed near-field frequency spectrum of main shock and the acceleration attenuation equation for Hexi region, Gansu province, are discussed based on the data of M_S6.1 main shock and M_S5.8 aftershock.

关 键 词：民乐-山丹地震 近场强震动 数字化记录 衰减 

分 类 号：P315.63[天文地球—地震学]