赵盼盼^1,,
MichelCampillo²,
陈九辉^1,,,
刘启元¹,
李昱¹,
郭飚¹
1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029
2. Laboratoire de Geophysique Interne et de Tectonophysique, Université Joseph Fourier, CNRS, Grenoble 38000, France

基金项目: 国家自然科学基金项目(41804055, 41590862, 41274060)和国家重点研发项目(2017YFC1500103)联合资助


详细信息

作者简介: 赵盼盼, 博士, 主要从事宽频带地震学研究.E-mail:panpanzhao@live.cn

通讯作者: 陈九辉, 研究员, 主要从事宽频带地震学和深部探测研究.E-mail:chenjh@ies.ac.cn

中图分类号: P315

收稿日期:2019-04-03
修回日期:2020-06-22
上线日期:2020-10-05

Topographic correction in ambient noise tomography

ZHAO PanPan^1,,
Michel Campillo²,
CHEN JiuHui^1,,,
LIU QiYuan¹,
LI Yu¹,
GUO Biao¹
1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. Laboratoire de Geophysique Interne et de Tectonophysique, Université Joseph Fourier, CNRS, Grenoble 38000, France


More Information

Corresponding author: CHEN JiuHui,E-mail:chenjh@ies.ac.cn

MSC: P315

--> Received Date: 03 April 2019
Revised Date: 22 June 2020
Available Online: 05 October 2020


摘要
摘要:以传统地震环境噪声面波成像方法研究地壳速度结构时，在一些极端的地形条件下，结果与真实结构会存在较大偏差.我们以地震波场三维正演模拟为基础，提出了一种地形校正方法.我们保留了传统噪声面波成像简单的两步反演法，在面波层析成像和一维速度结构反演的基础上，通过地震波场三维模拟近似估计地形和散射波场的影响，并据此校正瑞利波频散曲线，最终反演得到校正地形影响的S波速度结构.理论测试与在实际观测数据上的应用都证明了校正方法的有效性，同时也显示了地形校正的必要性.
关键词: 地震环境噪声/
速度结构/
地形校正/
龙门山断裂带

Abstract:When the crustal velocity structure is studied by the classical ambient noise tomography, the results will biased under some extreme topographic conditions. We develop a topographic correction method based on the finite element simulation of the 3D seismic wavefield. We keep the simple two-step inversion process of the classical ambient noise tomography, which are surface wave tomography and 1D S wave velocity inversion, and approximately estimate the influence of topography and scattering by 3D simulation of seismic wavefield. Then we correct the dispersion curve of Rayleigh waves, and finally invert it to the corrected S-wave velocity structure. Both the theoretical test and the application to the actual observation data prove the validity of the correction method, and demonstrate the necessity of topography correction.
Key words:Seismic ambient noise/
Fine velocity structure/
Topographic correction/
Longmenshan fault



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