采用FDTD方法模拟三种简单沉积结构模型的脉动H/V响应

地震 ›› 2010, Vol. 30 ›› Issue (4): 74-81.

采用FDTD方法模拟三种简单沉积结构模型的脉动H/V响应

彭菲¹, 黄玲², 陈棋福¹, 刘澜波^1,3

1.中国地震局地震预测研究所, 北京 100036;
2.吉林大学地球探测科学与技术学院, 吉林长春 130026;
3.康涅狄格大学, 康涅狄格 06269, 美国

收稿日期:2010-03-17 修回日期:2010-06-30 出版日期:2010-10-31 发布日期:2021-10-19
作者简介:彭菲(1981-), 女, 河北昌黎人, 2008年获硕士学位, 主要从事地震波场数值模拟等研究。
基金资助:
基本科研业务费专项(02092415)和国际科技合作项目(2006DFA21650)资助

Simulation of Microtremor H/V Responses to Three Simple Sediment Structure Models Using Finite Difference Time Domain Method

PENG Fei¹, HUANG Ling², CHEN Qi-fu¹, LIU Lan-bo^1,3

1. Institute of Earthquake Science, CEA, Beijing 100036, China;
2. College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China;
3. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA

Received:2010-03-17 Revised:2010-06-30 Online:2010-10-31 Published:2021-10-19

摘要/Abstract

摘要： 利用地脉动进行地球物理无源探测技术, 并基于地脉动观测的水平分量与竖直分量谱比法(H/V), 获取沉积层卓越频率和沉积盖层厚度已得到较广泛的应用。本文从正演的角度出发, 分别建立了水平层状、倾斜层状和不均匀构造三种由简单到复杂的模型, 采用时域有限差分方法(FDTD)模拟地脉动随机源的探测数据, 将数值模拟获得的数据利用H/V谱比法(Nakamura方法)进行反推, 与原模型设置值相对比符合良好, 表明FDTD的全波正演能很好地模拟获得各种模型在随机源激发下产生的稳定波场信息, 为应用地脉动探测研究城市沉积层提供了科学的依据。

关键词: 地脉动, 二维模拟, 时域有限差分, 谱比法(H/V)

Abstract: Microtremor for geophysical passive detection has been rapid developed. Based on the horizontal to vertical spectral ratio (H/V) from the microtremor observation, resonant frequency and sediment thickness can be obtained. In this paper, we set up three kinds of fundamental structures from simple to complex (i.e., a flat layer sediment, a dip layer sediment, a normal and a thrust fault) to simulate the ambient noise superposition and interference using the 2-D finite difference time domain (FDTD) method. The results match well the inversion obtained from the H/V spectral contrast method (Nakamura method), which means the FDTD method can also be a good simulation method to obtain the wave field information generated by random sources, and can provide valuable scientific insight for microtremor applications in earthquake engineering studies.

Key words: Microtremor, 2-D simulation, Finite difference time domain, H/V spectral ratio

中图分类号:

P315.7

彭菲, 黄玲, 陈棋福, 刘澜波. 采用FDTD方法模拟三种简单沉积结构模型的脉动H/V响应[J]. 地震, 2010, 30(4): 74-81.

PENG Fei, HUANG Ling, CHEN Qi-fu, LIU Lan-bo. Simulation of Microtremor H/V Responses to Three Simple Sediment Structure Models Using Finite Difference Time Domain Method[J]. EARTHQUAKE, 2010, 30(4): 74-81.

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