A Frequency Domain Methodology for Quantitative Evaluation of Diffuse Wavefield With Applications to Seismic Imaging

Yang，Bo1,2; Meng，Haoran1,2; Gu，Ning1,2; Liu，Xin3; Chen，Xiaofei1,4; Ben-Zion，Yehuda5,6

2024-05-01

10.1029/2024JB028895

Journal of Geophysical Research: Solid Earth   影响因子和分区

2169-9313

2169-9356

Ambient Noise Imaging (ANI) of subsurface structures relies on seismic interferometry of diffuse seismic wavefields. However, the lack of effective methods to quantify and identify highly diffuse waves hampers applications of ANI, particularly in evaluating seismic attenuation and monitoring structural changes with high temporal resolution. Conventional ANI approaches require data normalization, which effectively suppresses the non-diffuse component with large amplitude but also results in significant loss of amplitude and phase information in the continuous seismic records. In this study, we propose a frequency domain method to quantitatively evaluate the degree of diffuseness of seismic wavefields by analyzing their statistical characteristics of modal amplitudes for stationarity and randomness. Tests on synthetic waveform and field nodal records show that the proposed method can effectively distinguish between diffuse and non-diffuse waveforms for either single- or three-component data. As an application, we identify a 60-s-long diffuse coda of a local M 2.2 earthquake recorded by a dense nodal array on the San Jacinto Fault Zone, and successfully extract high-quality dispersion curve and Q-value without performing data normalization. These results are consistent with those obtained by conventional methods that assess the correlation between coherency and the Green's function, and by modeling ballistic waves generated by road traffic. Our proposed method can advance the imaging of subsurface velocity and attenuation structures as well as monitoring temporal changes for scientific studies and engineering applications.

ambient noise imaging attenuation diffuse wavefield dispersion curve earthquake coda Q-value

SCI

英语

第一 ; 通讯

GEOSCIENCES

2-s2.0-85193000162

Scopus

1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
2.Shanghai Sheshan National Geophysical Observatory,Shanghai,China
3.Department of Earth Sciences,University of Hong Kong,Hong Kong
4.Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen,China
5.Department of Earth Sciences,University of Southern California,Los Angeles,United States
6.Statewide California Earthquake Center,Los Angeles,United States

Yang，Bo,Meng，Haoran,Gu，Ning,et al. A Frequency Domain Methodology for Quantitative Evaluation of Diffuse Wavefield With Applications to Seismic Imaging[J]. Journal of Geophysical Research: Solid Earth,2024,129(5).

Yang，Bo,Meng，Haoran,Gu，Ning,Liu，Xin,Chen，Xiaofei,&Ben-Zion，Yehuda.(2024).A Frequency Domain Methodology for Quantitative Evaluation of Diffuse Wavefield With Applications to Seismic Imaging.Journal of Geophysical Research: Solid Earth,129(5).

Yang，Bo,et al."A Frequency Domain Methodology for Quantitative Evaluation of Diffuse Wavefield With Applications to Seismic Imaging".Journal of Geophysical Research: Solid Earth 129.5(2024).