微动信号模拟及其在微动勘探中的应用

doi:10.11720/wtyht.2023.1303

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摘要

对于简正振型叠加法合成的微动信号,使用空间自相关法计算的频散曲线与理论频散曲线对比,发现两者具有较好的一致性。模拟微动信号时涉及许多参数,这些参数对微动勘探开展具有重要意义。对这些参数进行了数值试验,试验结果表明:震源距离和台阵尺寸对结果有明显影响,在复杂地层情况下应考虑高阶面波,在安静的观测场地应用小尺寸台阵往往能获得更高频率的频散信息从而提高浅层分辨率。因此,在实际开展微动勘探时,应考虑震源分布、台阵尺寸和高阶面波等因素对勘探结果的影响。

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	李传金
	王强
	渐翔
	郑涛
	詹素华
	陈绍伟

关键词 ：微动信号, 简正振型叠加, 微动勘探, 频散曲线, 空间自相关法

Abstract：

This study synthesized microtremor signals using the normal mode superposition.The dispersion curves of the synthesized microtremor signals were calculated using the spatial autocorrelation method,and the calculated results agreed well with theoretical dispersion curves.The simulation of microtremor signals involves many parameters,which are of great significance for microtremor exploration.As shown by results from numerical experiments of these parameters,the hypocentral distance and array size had a significant influence on the results.Moreover,high-order surface waves should be considered for complex strata,while small-size arrays tended to yield high-frequency dispersion information at quiet observation sites,thus improving the resolution of shallow strata.Therefore,it is necessary to consider the influences of hypocenter distribution,array size,and high-order surface waves on exploration results in microtremor exploration.

Key words： microtremor signal normal mode superposition microtremor exploration dispersion curve spatial autocorrelation method

收稿日期: 2022-06-16 修回日期: 2023-02-01 出版日期: 2023-08-20

ZTFLH:

P631

基金资助:中国科学院重点部署项目(ZDRW-ZS-2021-3-1);福建理工大学科研发展基金(GY-Z17157)

作者简介: 李传金(1982-),男,博士,副教授,主要从事微动勘探研究工作。Email:licj04@126.com

引用本文:

李传金, 王强, 渐翔, 郑涛, 詹素华, 陈绍伟. 微动信号模拟及其在微动勘探中的应用[J]. 物探与化探, 2023, 47(4): 1040-1047.
LI Chuan-Jin, WANG Qiang, JIAN Xiang, ZHENG Tao, ZHAN Su-Hua, CHEN Shao-Wei. Microtremor signal simulation and its application in microtremor exploration. Geophysical and Geochemical Exploration, 2023, 47(4): 1040-1047.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1303 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I4/1040

Table 1 地层模型参数

Fig.1 台阵布置

Fig.2 震源分布

Fig.3 合成微动信号垂直分量的波形

Fig.4 空间自相关系数

Fig.5 合成微动信号的频谱

Fig.6 理论频散曲线与合成频散曲线对比

Fig.7 使用不同震源距离计算的频散曲线
a—震源距离1~50 m;b—震源距离50~200 m;c—频散曲线对比

Fig.8 使用不同台阵尺寸计算的频散曲线
a—台阵半径R=1 m;b—台阵半径R=100 m;c—频散曲线对比

Table 2 含高速硬夹层的地层模型参数

Fig.9 含高速硬夹层的地层模型计算的频散曲线
a—合成微动信号的频散曲线;b—各阶瑞利波能量占比;c—频散曲线对比

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