不同台阵形式对微动探测结果的影响  

Influence of Different Array Type on the Results of Microtremor Survey

作　　者：李井冈[1] 谢朋 王秋良[1] 虞金鑫 沈雨忆 LI Jinggang;XIE Peng;WANG Qiuliang;YU Jinxin;SHEN Yuyi(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Xiamen Vanke Co Ltd,859 West-Lianqian Road,Xiamen 361000,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,武汉市430071 [2]厦门市万科房地产有限公司,厦门市361000

出　　处：《大地测量与地球动力学》2020年第1期98-103,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41572354)~~

摘　　要：在江汉盆地的同一场地分别采用三重圆形、T形及L形3种不同台阵形式进行微动探测观测对比实验,结果表明,3种台阵形式提取到的频散曲线基本一致,但频散图谱能量集中度具有明显的差异。三重圆形台阵频散图谱能量集中度最高,L形、T形台阵在2.0~4.6 Hz频段范围内集中度较高,而在1.2~2.0 Hz频段范围内较分散;相比T形和L形台阵,三重圆形台阵更易于探测到地层分界面附近的波速突变特征,即三重圆形台阵比其他两种台阵形式准确性及可靠性更高。In the same site of Jianghan basin,three different array forms:triple circular,T-shaped and L-shaped,are used for observation and comparison experiments.The results show that the dispersion curves of the three arrays are basically the same;the energy concentration degree of the three arrays is obviously different.The energy concentration degree of the triple circular arrays is the highest,and the concentration degree of the L-shaped and T-shaped arrays is also higher in the range of 2.0-4.6 Hz.Compared with the T-shaped and L-shaped arrays,the wave velocity contrast of the triple circular arrays near the stratigraphic interface is more obvious;that is,the triple circular arrays is more reliable and accurate than the other two array forms.

关 键 词：微动探测 SPAC法 台阵形式 地层结构 江汉盆地 

分 类 号：P315[天文地球—地震学]