Premium
Aseismic slip and seismogenic coupling along the central San Andreas Fault
Author(s) -
Jolivet R.,
Simons M.,
Agram P. S.,
Duputel Z.,
Shen Z.K.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl062222
Subject(s) - san andreas fault , geology , seismology , seismic gap , slip (aerodynamics) , fault (geology) , magnitude (astronomy) , elastic rebound theory , slow earthquake , geodesy , interplate earthquake , foreshock , aftershock , physics , astronomy , thermodynamics
Abstract We use high‐resolution Synthetic Aperture Radar‐ and GPS‐derived observations of surface displacements to derive the first probabilistic estimates of fault coupling along the creeping section of the San Andreas Fault, in between the terminations of the 1857 and 1906 magnitude 7.9 earthquakes. Using a fully Bayesian approach enables unequaled resolution and allows us to infer a high probability of significant fault locking along the creeping section. The inferred discreet locked asperities are consistent with evidence for magnitude 6+ earthquakes over the past century in this area and may be associated with the initiation phase of the 1857 earthquake. As creeping segments may be related to the initiation and termination of seismic ruptures, such distribution of locked and creeping asperities highlights the central role of the creeping section on the occurrence of major earthquakes along the San Andreas Fault.