喀什乌恰地区场地卓越周期T_(0)和V_(s20)相关性研究  

STUDY ON CORRELATION BETWEEN SITE DOMINANT PERIOD T_(0) AND V_(s20) IN KASHI WUQIA AREA

作　　者：何金刚[1] 李文倩[1] 魏斌[1] HE Jin-gang;LI Wen-qian;WEI Bin(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2021年第3期231-236,共6页Inland Earthquake

基　　金：中国地震局地震科技星火计划项目(XH20068Y).

摘　　要：以喀什乌恰地区为研究区,利用统计回归的方法,采用线性对数模型,拟合得到该地区V_(s10)和V_(s20)关系式,lgV_(s20)=0.3944+0.8616lgV_(s10);T_(0)和V_(s20)关系式,ln(V_(s20))=5.1497-0.4026ln(T_(0)),2个关系式决定系数均大于0.8,相关性较好。T_(0)和V_(s20)分析中,发现当场地覆盖层厚度较小时,场地卓越周期较小,此时T_(0)主要受剪切波速影响,2者相关性较好;当场地覆盖层厚度较大时,场地卓越周期较大,此时T_(0)受剪切波速影响有所减弱。Taken Kashi Wuqia area as the research region,use the statistical regression method with the linear logarithmic model to obtain the relationship between V_(s10) and V_(s20),lgV_(s2)=0.3944+0.8616lgV_(s10),and the relationship between To and V_(S20),In(V_(s20))=5.1497-0.4026ln(T_(0)),the determination coefficients of the two relations are both greater than 0.8,have the good correlation.In the analysis of T_(0) and V_(s20),we find that when the site overburden thickness is small,the dominant period is small,in this case,T_(0) is mainly affected by shear wave velocity;when the site overburden thickness is large,the dominant period is large,T_(0) is not only affected by shear wave velocity,but also affected by the density of each soil layer.

关 键 词：场地卓越周期 等效剪切波速 统计回归分析 喀什乌恰地区 

分 类 号：P315.7[天文地球—地震学]