Dynamic rupture in a 3-D particle-based simulation of a rough planar fault

Abe, S, Latham, S and Mora, P (2006) Dynamic rupture in a 3-D particle-based simulation of a rough planar fault. Pure And Applied Geophysics, 163 9: 1881-1892.


Author Abe, S
Latham, S
Mora, P
Title Dynamic rupture in a 3-D particle-based simulation of a rough planar fault
Journal name Pure And Applied Geophysics   Check publisher's open access policy
ISSN 0033-4553
Publication date 2006
Sub-type Article (original research)
DOI 10.1007/s00024-006-0102-6
Volume 163
Issue 9
Start page 1881
End page 1892
Total pages 12
Place of publication Basel
Publisher Birkhauser Verlag Ag
Collection year 2006
Language eng
Subject C1
Abstract An appreciation of the physical mechanisms which cause observed seismicity complexity is fundamental to the understanding of the temporal behaviour of faults and single slip events. Numerical simulation of fault slip can provide insights into fault processes by allowing exploration of parameter spaces which influence microscopic and macroscopic physics of processes which may lead towards an answer to those questions. Particle-based models such as the Lattice Solid Model have been used previously for the simulation of stick-slip dynamics of faults, although mainly in two dimensions. Recent increases in the power of computers and the ability to use the power of parallel computer systems have made it possible to extend particle-based fault simulations to three dimensions. In this paper a particle-based numerical model of a rough planar fault embedded between two elastic blocks in three dimensions is presented. A very simple friction law without any rate dependency and no spatial heterogeneity in the intrinsic coefficient of friction is used in the model. To simulate earthquake dynamics the model is sheared in a direction parallel to the fault plane with a constant velocity at the driving edges. Spontaneous slip occurs on the fault when the shear stress is large enough to overcome the frictional forces on the fault. Slip events with a wide range of event sizes are observed. Investigation of the temporal evolution and spatial distribution of slip during each event shows a high degree of variability between the events. In some of the larger events highly complex slip patterns are observed.
Keyword Lattice Solid Model
Fault Simulation
Slip Complexity
Geochemistry & Geophysics
Earthquake Rupture
Friction
Models
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 08:39:33 EST