A phase unwrapping approach in measuring surface wave phase velocities from ambient noise

Xie, Yanan1,2; Luo, Yinhe1,3; Yang, Yingjie2,4

2024-09-04

10.1093/gji/ggae288

GEOPHYSICAL JOURNAL INTERNATIONAL   影响因子和分区

0956-540X

1365-246X

In the past two decades or so, ambient noise tomography (ANT) has emerged as a powerful tool for investigating high-resolution crustal and upper-mantle structures. A crucial step in the ANT involves extracting phase velocities from cross-correlation functions (CCFs). However, obtaining precise phase velocities can be a formidable challenge, particularly when significant lateral velocity variations exist in shallow subsurface imaging that relies on short-period surface waves from ambient noise. To address this challenge, we propose an unwrapping correction method that enables the accurate extraction of short-period dispersion curves. Our method relies on the examination of the continuity of phase velocities extracted from CCFs between a common station and other neighbouring stations along a linear array. We demonstrate the effectiveness of our approach by applying our method to both synthetic and field data. Both applications suggest our unwrapping correction method can identify and correct unwrapping errors in phase velocity measurements, ensuring the extraction of accurate and reliable dispersion curves at short periods from ambient noise, which is essential for subsequent inversion for subsurface structures.

Computational seismology Seismic noise Surface waves and free oscillations

SCI

英语

其他

National Science Foundation of China["42074055","42374057","42304067","42074069"] ; National Science Foundation of China (NSFC)[2023AFD211] ; MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources[MSFGPMR2022-4]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001305630200004

OXFORD UNIV PRESS

Web of Science

1.China Univ Geosci, Sch Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China
2.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China
3.China Univ Geosci, Sch Geophys & Geomat, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
4.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High resolut Imagin, Shenzhen 518055, Peoples R China

Xie, Yanan,Luo, Yinhe,Yang, Yingjie. A phase unwrapping approach in measuring surface wave phase velocities from ambient noise[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2024,239(1).

Xie, Yanan,Luo, Yinhe,&Yang, Yingjie.(2024).A phase unwrapping approach in measuring surface wave phase velocities from ambient noise.GEOPHYSICAL JOURNAL INTERNATIONAL,239(1).

Xie, Yanan,et al."A phase unwrapping approach in measuring surface wave phase velocities from ambient noise".GEOPHYSICAL JOURNAL INTERNATIONAL 239.1(2024).