The lattice solid model to simulate the physics of rocks and earthquakes: Incorporation of friction


Autoria(s): Place, David; Mora, Peter
Data(s)

10/04/1999

Resumo

The particle-based lattice solid model developed to study the physics of rocks and the nonlinear dynamics of earthquakes is refined by incorporating intrinsic friction between particles. The model provides a means for studying the causes of seismic wave attenuation, as well as frictional heat generation, fault zone evolution, and localisation phenomena. A modified velocity-Verlat scheme that allows friction to be precisely modelled is developed. This is a difficult computational problem given that a discontinuity must be accurately simulated by the numerical approach (i.e., the transition from static to dynamical frictional behaviour). This is achieved using a half time step integration scheme. At each half time step, a nonlinear system is solved to compute the static frictional forces and states of touching particle-pairs. Improved efficiency is achieved by adaptively adjusting the time step increment, depending on the particle velocities in the system. The total energy is calculated and verified to remain constant to a high precision during simulations. Numerical experiments show that the model can be applied to the study of earthquake dynamics, the stick-slip instability, heat generation, and fault zone evolution. Such experiments may lead to a conclusive resolution of the heat flow paradox and improved understanding of earthquake precursory phenomena and dynamics. (C) 1999 Academic Press.

Identificador

http://espace.library.uq.edu.au/view/UQ:85947

Idioma(s)

eng

Publicador

Academic Press

Palavras-Chave #Computer Science, Interdisciplinary Applications #Physics, Mathematical #Friction #Earthquakes #Nonlinear Dynamics #Lattice Solid Model #Particle-based Model #Heat Of Earthquakes #Fault Gouge #Numerical Simulation #Rock Physics #Heat Flow Paradox #Dynamics #C1 #260206 Earthquake Seismology #780104 Earth sciences
Tipo

Journal Article