孙楠^1,2,3,,
潘磊³,
王伟涛⁴,
叶泵²,
王彬²,
陈晓非^3,5,,
1. 中国科学技术大学地球与空间科学学院, 合肥 230026
2. 云南省地震局, 昆明 650224
3. 南方科技大学地球与空间科学系 深圳 518055
4. 中国地震局地球物理研究所, 北京 100081
5. 深圳市深远海油气勘探技术重点实验室, 深圳 518055

基金项目: 国家自然科学基金项目（41790465，U1901602，41474048，41574059）和珠江人才计划（2016LJ06N652）资助


详细信息

作者简介: 孙楠, 女, 1987年生, 博士, 主要从事主动源和面波成像研究.E-mail: China_yn_sn@163.com

通讯作者: 陈晓非, 教授, 主要从事地震波传播和震源破裂动力学理论与数值模拟研究.E-mail: chenxf@sustech.edu.cn

中图分类号: P315

收稿日期:2021-01-25
修回日期:2021-09-16
上线日期:2021-11-10

Inversion of shear wave velocity structure beneath the Binchuan airgun source area using a nested combination of multi-scale arrays

SUN Nan^1,2,3,,
PAN Lei³,
WANG WeiTao⁴,
YE Beng²,
WANG Bin²,
CHEN XiaoFei^3,5,,
1. University of Science and Technology of China School of Earth and Space Sciences, Hefei 230026, China
2. Yunnan EarthquakeAgency, Kunming 650224, China
3. Southern University of Science and Technology, Shenzhen 518055, China
4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
5. Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Shenzhen 518055, China


More Information

Corresponding author: CHEN XiaoFei,E-mail:chenxf@sustech.edu.cn

MSC: P315

--> Received Date: 25 January 2021
Revised Date: 16 September 2021
Available Online: 10 November 2021


摘要
摘要:本文基于多尺度阵列嵌套组合的方式，利用频率-贝塞尔变换法（Frequency-Bessel，F-J方法）提取背景噪声面波频散信息，通过多个阵列融合的频散曲线反演得到宾川气枪发射台周边不同深度的横波速度结构.结果显示：浅层一阶面波频散信息的加入，使得基阶反演结果更加收敛，反演深度加深到8 km；深度在8 km以下的结构的研究利用多尺度阵列（密集台阵-宾川气枪台网-云南区域地震台网）嵌套组合的方式，面波基阶低频信息从0.55 Hz拓宽到0.008 Hz，使横波速度结构的反演深度显著增加，同时对反演过程提供约束，使得70 km深度以上的横波速度更收敛.由此本文所得的横波速度结构为该区地下结构的探测提供基础，多尺度阵列嵌套组合频散谱的研究方式也为以后区域结构的研究提供一种新的方法和思路.
关键词: 频率-贝塞尔变换法/
背景噪声/
面波频散/
多尺度阵列嵌套组合/
横波速度

Abstract:Based on a nested combination style of multi-scale arrays, we used the frequency-Bessel transform method to extract dispersion information on surface waves from ambient noise, then inverted the shear wave velocity structure at different depths of the area surrounding the Binchuan airgun source launcher with multi-scale fusion dispersion curves. Results show that using dispersion information of multi-modes surface waves can make the inversion result be more convergence and inversion depth increase to 8 km. As for the structure below the depth 8 km, using the nested combination style of multi-scale arrays (dense array-Binchuan airgun seismic network-Yunnan region seismic network) can broaden the lowest frequency of fundamental surface waves from 0.55 Hz to 0.008 Hz, so that the inversion depth of shear waves increases significantly. Meanwhile the inversion results of shear waves are more convergent above 70 km depth. The shear wave structure from this work could provide a basis for detecting underground structure of the study area, and the nested combination style of multi-scale arrays dispersion spectra provides a new approach for research of regional structure in the future.
Key words:Frequency-Bessel transform method/
Ambient noise/
Dispersion information of surface waves/
Nested combination of multi-scale arrays/
Shear wave velocity



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