Influence of Creep Compaction and Dilatancy on Earthquake Sequences and Slow Slip

Abstract

The role of fluids in controlling fault zone strength and the occurrence of earthquakes, slow slip events, and aseismic slip has been recognized for many decades. The focus on fluids has mounted in recent years as new observations are linking fluids to slow slip and possibly even the nucleation of great earthquakes (Frank

Linking 3D Long‐Term Slow‐Slip Cycle Models With Rupture Dynamics: The Nucleation of the 2014 Mw 7.3 Guerrero, Mexico Earthquake

“…By coupling porosity and permeability evolution to elastic fault deformation, Yang and Dunham (2023) demonstrate the potentially critical role of pore fluid transportation and permeability evolution on slow slip and seismic cycles in a 2D antiplane fault model. Using a two-phase flow model that couples solid rock deformation and pervasive fluid flow, dal Zilio et al ( 2020) investigate the effect of poroelastic coupling on long-term fault evolution in a solid-fluid constitutive framework but restricted to 2D.…”

“…J. Liu, 2013). The effects of dilatancy and permeability enhancement in highly permeable fault zones may alter aseismic slip (Yang & Dunham, 2023). Dal Zillo et al, 2020 consider dilatancy to model SSEs in a planar Cascadia model and find slightly slower down-dip rupture speed and longer event durations, which may affect megathrust earthquake nucleation.…”

“…Integrated modeling of long-term tectonic loading and coseismic rupture advances the understanding of the dynamics of interseismic and coseismic slip, as well as their interplay (Cattania, 2019;Kaneko et al, 2011;Liu et al, 2020). While a few implementations have been developed to integrate long-term slow interseismic loading and fast coseismic rupture (Cattania & Segall, 2021;Segall et al, 2010;Yang & Dunham, 2023), they typically omit inertia effects during the interseismic period. Liu et al (2020) couple two 3D finite element methods, one for long-term seismic cycle modeling and another for short-term dynamic earthquake rupture, linking stress and frictional parameters in geometrically simple setups.…”