A Detailed Understanding of Slow Self-Arresting Rupture

Wei, Xueting1; Liu, Yuxiang1,2; Xu, Jiankuan1; Liu, Wei1; Chen, Xiaofei1,3

2024-08-01

10.1029/2024JB028881

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   影响因子和分区

2169-9313

2169-9356

["Recent numerical simulation studies suggest the existence of a seismic type that is distinct from regular earthquakes-the slow self-arresting rupture (SSAR). Unlike regular earthquakes that propagate dynamically following the initiation, The SSARs automatically arrest within the nucleation zone without interference. Additionally, numerical simulations indicate that SSARs exhibit a significantly lower energy release compared to regular earthquakes, while also exhibiting a relatively long source duration. Given these distinctive properties, comprehending the source processes of SSARs assumes great strategic importance. However, our current understanding of SSARs, particularly regarding their response to different frictional conditions and their correlation with natural phenomena, remains limited in scope. To further explore the intricacies of SSARs, we employ a three-dimensional fully dynamic source model to simulate SSARs under various slip-weakening frictional conditions. The findings indicate that SSARs occur in frictional environments characterized by large normalized critical slip distances, with the seismic source process being primarily influenced by this parameter. Apart from displaying significantly smaller average slip and stress drop, which are two to three orders of magnitude lower than those of regular earthquakes of comparable magnitude, SSARs also showcase a decrease in duration, seismic moment, slip rate, and stress drop as the normalized critical slip distance increases. The moment-duration scaling law of SSARs exhibits a linear pattern. Moreover, the observation of slow earthquakes offers further implications for the presence of SSARs, indicating their potential association with a wider range of intricate seismic phenomena.","The source process of earthquakes is an important issue that has been widely studied. Through numerical simulations, we have identified a distinct type of earthquake characterized by slow evolution process and relatively low moment release: slow self-arresting rupture (SSAR). Here, we conduct simulations with different frictional conditions to gain insights into the unique source processes of SSARs and explore the influencing factors. Unlike regular earthquakes that dynamically propagate after the initiation of sliding, SSARs autonomously terminate within the same region of their initial occurrence, without encountering any barriers or obstructions. Additionally, SSARs occur on faults of different shapes and their occurrence is mainly influenced by frictional conditions. Unlike regular earthquakes, the source duration, slip, slip rate, stress drop, and seismic moment of SSARs decrease as the normalized critical slip distance increases. The similarity between the source characteristics of SSARs and observed slow earthquakes implies the possibility of detecting SSARs in real-world scenarios and their association with intricate seismic phenomena.","The slow self-arresting rupture releases less moment over a longer duration compared to regular earthquakes The source process of slow self-arresting rupture is predominantly governed by the normalized critical slip distance The slow self-arresting rupture exhibits waveforms and spectra similar to low-frequency earthquakes and very low-frequency earthquakes"]

SCI

英语

第一 ; 通讯

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

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001292159000001

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. A Detailed Understanding of Slow Self-Arresting Rupture[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2024,129(8).

Wei, Xueting,Liu, Yuxiang,Xu, Jiankuan,Liu, Wei,&Chen, Xiaofei.(2024).A Detailed Understanding of Slow Self-Arresting Rupture.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,129(8).

Wei, Xueting,et al."A Detailed Understanding of Slow Self-Arresting Rupture".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 129.8(2024).