Array-Based Teleseismic Love Wave Tomography

Zhao, Kaifeng1,2; Yang, Yingjie3; Luo, Yinhe1,2

2023

10.1029/2022JB024890

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Impact Factor & Quartile

2169-9313

2169-9356

Fundamental mode Love waves from earthquakes can be contaminated by higher modes, which can affect the accuracy of phase velocity measurements. If such contaminations are not well dealt with, models of Earth's interior structures based on Love waves could be significantly biased. In this study, we develop an array-based teleseismic Love wave tomography method that can mitigate higher-mode interference effects and therefore obtain more accurate phase-velocity maps compared to previous studies. By applying our tomography method to synthetic data, we first illustrate the effectiveness of our method in construction phase velocity maps of fundamental Love waves when 30% of Love waves are contaminated by higher modes. In addition, as a case study, we apply our method to field data from the Western United States to construct phase velocity maps at 20-100 s period. By comparing phase velocity maps obtained by our method with those obtained by ambient noise data which do not suffer the interferences of higher modes, we demonstrate our method can obtain Love wave phase velocity maps as accurately as those based on ambient noise data with deviations smaller than 0.5% of the average value of these phase velocity maps, further illustrating the validity of our method in constructing Love wave phase velocity maps. Plain Language SummaryLove waves excited by earthquakes contain different modes, which could interfere with each other, resulting in inaccurate measurements of their propagation speeds. If such interferences are not properly dealt with, the resulting models of Earth's interior structures constructed by Love waves could be significantly biased. In this study, we develop an array-based tomography method, which can circumvent the problem of interferences of Love waves. By applying our method to synthetic and field data, we demonstrate the effectiveness of our method in constructing Love waves phase velocity maps. These maps can be exploited to understand the deformation and evolution of lithosphere and asthenosphere.

Love waves interferences tomography

SCI

English

NI Journal Papers

Corresponding

National Science Foundation of China (NSFC)["41904058","42074055","41874058"] ; Fundamental Research Funds for the Central Universities, China University of Geosciences[MSFGPMR2022-4] ; China Postdoctoral Science Foundation[2021M702993]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000943262300001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.China Univ Geosci, Sch Geophys & Geomatics, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Zhao, Kaifeng,Yang, Yingjie,Luo, Yinhe. Array-Based Teleseismic Love Wave Tomography[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(1).

Zhao, Kaifeng,Yang, Yingjie,&Luo, Yinhe.(2023).Array-Based Teleseismic Love Wave Tomography.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(1).

Zhao, Kaifeng,et al."Array-Based Teleseismic Love Wave Tomography".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.1(2023).