利用空间自相关法研究华北克拉通中部瑞雷面波频散特征  

Application of SPAC Method to Study the Character of Rayleigh Wave Phase Velocity in North China Craton

作　　者：刘建欢 徐佩芬[2] 凌甦群[3] 游志伟 LIU Jian-huan;XU Pei-fen;LING Su-qun;YOU Zhi-wei(China Earthquake Administration,Beijing 100029,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Geo-Analysis Institute Co.,Ltd.,Tokyo 184-0012,Japan;Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China)

机构地区：[1]中国地震局地质研究所,北京100029 [2]中国科学院地质与地球物理研究所,北京100029 [3]日本地学数据分析中心,东京184-0012 [4]中国科学院深圳先进技术研究院,深圳518055

出　　处：《科学技术与工程》2023年第8期3162-3167,共6页Science Technology and Engineering

基　　金：国家自然科学基金(41274143)。

摘　　要：华北克拉通(North China Craton, NCC)是中国大陆最古老的克拉通之一,是研究大陆岩石圈形成与演化的天然实验室。利用华北地震科学台阵在2007年1月13日记录的地震微动信号的垂向分量,采用空间自相关法(spatial autocorrelation method, SPAC)获得了华北克拉通中部块体7~33 s的瑞雷波相速度频散曲线。结果表明:总体而言,研究区的频散曲线随周期增加而增大。7~12 s的相速度增加梯度较陡,可能反映了该区域地表太古宙至古生代早期的古老基岩露头的影响;13~16 s的相速度反映中地壳的速度变化,中部块体的相速度值随周期增大而逐渐减小,并在16 s时达到最小值,这与该地区中地壳发育低速层的地质背景较吻合。The North China Craton(NCC)is one of the oldest cratons in China's Mainland,and it is a natural laboratory for studing the formation and evolution of the continental lithosphere.Using the vertical component of microtremor recorded at North China Seismic Array during on January 13,2007,spatial autocorrelation method(SPAC)was employed to obtain Rayleigh wave phase velocity at periods from 7 s to 33 s for central North China Craton.The results show that in general,the dispersion curve of the study area increases with period.The phase velocity increases steeply at periods from 7 s to 12 s,which may imply the influence of this region s ancient base rock outbreaks between Archean and early Paleozoic.The phase velocity between period 13 s and 16 s show the velocity variation of crust,which decreases gradually as period increases and reaches its minimum at 16 s.This result is consistent with this region s geological background that a low-speed layer is developed in middle crust.

关 键 词：空间自相关法 瑞雷面波 相速度 微动 华北克拉通(NCC) 

分 类 号：P315[天文地球—地震学]