Co-Occurrence of Low and Very Low Frequency Earthquakes Explained From Dynamic Modeling

Wei, Xueting1; Liu, Yuxiang1,2; Xu, Jiankuan1; Chen, Xiaofei1,3

2024-06-16

10.1029/2023GL107988

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

["Very low-frequency earthquakes (VLFs) are characterized by longer source duration and smaller stress drop than regular earthquakes of similar magnitude. Recent studies have shown their frequent correlation with low-frequency earthquakes (LFEs) on shared faults. The underlying source processes governing the occurrence of VLFs and their interaction with LFEs remain elusive. Here, we employ a slip-weakening model for slow earthquakes. By comparing the source parameters of simulations and observations, it is suggested that VLFs are slow self-arresting earthquakes that self-terminate within the nucleation patch. Additionally, we adopt a composite model to reproduce the records of the simultaneous occurrences of a VLF and an LFE in the Nankai area. Our results present the possibility that VLFs, LFEs, and regular earthquakes can be distinguished using a unified dynamic framework.","Earthquakes can be divided into two groups: regular earthquakes and slow earthquakes. Regular earthquakes are the results of quick shear slip on faults, while slow earthquakes are generated from slow transient movements along the faults and radiate anomalous small energy. The mechanism that drives their different source characteristics remains elusive. Here, we employ an independent and composite dynamic source model to elucidate the unique attributes of very low-frequency earthquakes (LFEs), a type of slow earthquakes. By comparing the source parameters and waveforms of observations with simulations. The outcomes indicate that very LFEs potentially represent a seismic type that self-terminate within the region where the rupture is initially triggered.","Very low-frequency earthquakes (LFEs) are characterized by slow self-arresting processes Our model can simultaneously reproduce both very low-frequency and LFE The slip-weakening frictional model generates both fast and slow earthquakes"]

SCI ; EI

英语

第一 ; 通讯

National Key Research and Development Program of China[2021YFC3000702] ; China Postdoctoral Science Foundation[2023M731504] ; Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology[2022B1212010002] ; Shenzhen Science and Technology Program[KQTD20170810111725321] ; null[42304064] ; null[92155307] ; null[41874054]

Geology

Geosciences, Multidisciplinary

WOS:001235161700001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High Resolut Imagin, Shenzhen, Peoples R China

Wei, Xueting,Liu, Yuxiang,Xu, Jiankuan,et al. Co-Occurrence of Low and Very Low Frequency Earthquakes Explained From Dynamic Modeling[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(11).

Wei, Xueting,Liu, Yuxiang,Xu, Jiankuan,&Chen, Xiaofei.(2024).Co-Occurrence of Low and Very Low Frequency Earthquakes Explained From Dynamic Modeling.GEOPHYSICAL RESEARCH LETTERS,51(11).

Wei, Xueting,et al."Co-Occurrence of Low and Very Low Frequency Earthquakes Explained From Dynamic Modeling".GEOPHYSICAL RESEARCH LETTERS 51.11(2024).