2011年缅甸M7.2地震强震动观测记录初步分析  

Observation on Strong Motion of Myanmar M7.2 Earthquake Recorded by the Strong Motion Network in Yunnan

作　　者：刘琼仙[1] 李世成[1] 崔建文[1] 杨黎薇[1] 张潜[1] 

机构地区：[1]云南省地震局,云南昆明650224

出　　处：《地震研究》2012年第4期540-547,共8页Journal of Seismological Research

基　　金：地震行业科研专项项目"宁洱6.4级地震现场综合考察和研究"(200808061);地震行业科研专项20110803<地震紧急处置关键技术及在快速轨道交通工程中应用>联合资助

摘　　要：简要介绍了2011年3月24日缅甸勐帕亚M7.2地震发生后,云南强震动台网中心55个台站接收到的强震动记录及其初步处理结果,并对地震动衰减关系拟合、频谱随震中距的震域变化及地震动持时特征进行了分析。结果表明:由云南地区强震动记录资料拟合的地震动衰减关系相对于大陆区域的地震动衰减关系,与此次强震动记录具有更好的相关性。地震动加速度卓越频率依Ⅰ、Ⅱ、Ⅲ类场地及楼房结构而依次变低,且随着震中距加大,强震动记录主频值呈变小趋势。场地类别对地震动水平分量持时的影响比竖向分量更明显一些。最后对仪器触发范围、方式、响应半径问题进行了探讨。We introduce the seismic parameters of strong motion recordings of Mongpayak M7.2 earthquake on Mar. 24 in Myanmar recorded by 55 stations in Yunnan Strong Motion Network （YSMN） and their data processing results. Then we analyze the fitting attenuation curve, frequency attenuation with the epicenter distance and du- ration of ground motions. The results show that the attenuation relation of ground motion fitted by strong motion recordings in Yunnan is more correlative with the Myanmar MT. 2 earthquake than that in China. The predomi- nant frequency of ground motion acceleration decreases with the different site class I, II, III, different building structures, and the increasing of epicenter distance in turn. The effect of site class on the duration of ground mo- tion in horizontal component is more obvious than that in vertical component. Finally we discuss the trigger range, trigger mode and responding range of monitor in YSMN.

关 键 词：缅甸地震 强震动记录 地震动持时 触发方式 响应半径 

分 类 号：P315.914[天文地球—地震学]