Fault Slip Behaviors Modulated by Locally Increased Fluid Pressure: Earthquake Nucleation and Slow Slip Events

Peng, Dongdong; Xu, Ran; Yang, Hongfeng; Guo, Zhiyin; Xia, Kaiwen

doi:10.1029/2022jb024612

Cited by 1 publication

(1 citation statement)

References 91 publications

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“…Particularly, two slow slip transients propagating toward the epicenter of the 2011 Mw 9.0 Tohoku-Oki earthquake were believed to promote the occurrence of the mainshock [9]. Since the occurrence time and location of mainshocks are intimately related to the nucleation process [13], understanding the mechanism of earthquake nucleation is of great importance for earthquake prediction.…”

Section: Introductionmentioning

confidence: 99%

Nucleation Mechanism and Rupture Dynamics of Laboratory Earthquakes at Different Loading Rates

Wu,

Zhang,

Wang

et al. 2023

Applied Sciences

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The loading rate of tectonic stress is not constant during long-term geotectonic activity and significantly affects the earthquake nucleation and fault rupture process. However, the mechanism underlying the loading rate effect is still unclear. In this study, we conducted a series of experiments to explore the effect of the loading rate on earthquake nucleation and stick–slip characteristics. Through lab experiments, faults were biaxially loaded at varying rates to produce a series of earthquakes (stick–slip events). Both shear strain and fault displacement were monitored during these events. The findings indicate a substantial effect of the loading rate on the recurrence interval and the shear stress drop of these stick–slip events, with the recurrence interval inversely proportional to the loading rate. The peak friction of the fault also decreases with the increasing loading rate. Notably, prior to the dynamic rupture of earthquakes, there exists a stable nucleation phase where slip occurs in a quasi-static manner. The critical nucleation length, or the distance required before the dynamic rupture, diminishes with both the loading rate and normal stress. A theoretical model is introduced to rationalize these observations. However, the rupture velocity of these lab-simulated earthquakes showed no significant correlation with the loading rate. Overall, this study enhanced our comprehension of earthquake nucleation and rupture dynamics in diverse tectonic settings.

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Section: Introductionmentioning

confidence: 99%

Nucleation Mechanism and Rupture Dynamics of Laboratory Earthquakes at Different Loading Rates

Wu,

Zhang,

Wang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

Fault Slip Behaviors Modulated by Locally Increased Fluid Pressure: Earthquake Nucleation and Slow Slip Events

Abstract: Facilitated by the improvements of geodetic and seismic observation networks, a spectrum of unusual slow earthquakes has been discovered, including very low-frequency earthquakes, short-and long-term slow slip events (SSEs), and episodic tremor and slip (

Cited by 1 publication

References 91 publications

Nucleation Mechanism and Rupture Dynamics of Laboratory Earthquakes at Different Loading Rates

Nucleation Mechanism and Rupture Dynamics of Laboratory Earthquakes at Different Loading Rates

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