Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/, The Transition of Dynamic Rupture Styles in Elastic Media
 

Summary: JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/,
The Transition of Dynamic Rupture Styles in Elastic Media
Under Velocity-Weakening Friction
A.-A. Gabriel1
, J.-P. Ampuero2
, L. A. Dalguer1
, and P. M. Mai3
Abstract. Although kinematic earthquake source inversions show dominantly pulse-like
rupture behavior, seismological observations, laboratory experiments and theoretical mod-
els indicate that earthquakes can operate with two different rupture styles, either as pulses
or as cracks, and can propagate at subshear or supershear speeds. The determination
of rupture style and speed has important implications for ground motions and may in-
form about the state of stress and strength of active fault zones. Here we conduct 2D
in-plane dynamic rupture simulations with a spectral element method to investigate the
diversity of rupture styles on faults governed by velocity-and-state-dependent friction with
dramatic velocity-weakening at high slip rate. Our rupture models assume uniform ini-
tial stresses and are artificially initiated by prescribing time-weakening over a time-dependent
nucleation area. We identify the conditions that lead to different rupture styles. In par-
ticular we investigate the transitions between decaying, steady-state and growing pulses,
cracks, sub-shear and super-shear ruptures as a function of background stress, nucleation

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences