Multiscale Dynamics of Aseismic Slip on Central San Andreas Fault

M. Khoshmanesh, Manoochehr Shirzaei

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Understanding the evolution of aseismic slip enables constraining the fault's seismic budget and provides insight into dynamics of creep. Inverting the time series of surface deformation measured along the Central San Andreas Fault obtained from interferometric synthetic aperture radar in combination with measurements of repeating earthquakes, we constrain the spatiotemporal distribution of creep during 1992–2010. We identify a new class of intermediate-term creep rate variations that evolve over decadal scale, releasing stress on the accelerating zone and loading adjacent decelerating patches. We further show that in short-term (<2 year period), creep avalanches, that is, isolated clusters of accelerated aseismic slip with velocities exceeding the long-term rate, govern the dynamics of creep. The statistical properties of these avalanches suggest existence of elevated pore pressure in the fault zone, consistent with laboratory experiments.

Original languageEnglish (US)
Pages (from-to)2274-2282
Number of pages9
JournalGeophysical Research Letters
Issue number5
StatePublished - Mar 16 2018


  • InSAR
  • creep avalanches
  • creep dynamics
  • kinematic modeling
  • repeating earthquakes
  • slow slip events

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


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