Investigation of Fault Creep Variability Along the Southern San Andreas Fault
Shallow fault creep has been observed on a number of faults in California including the southern San Andreas fault (SSAF). To better understand the spatiotemporal variability of fault creep along the SSAF, we analyze multiple satellite and airborne interferometric synthetic aperture radar (InSAR) data including ERS & Envisat, ALOS-2, Sentinel-1 and UAVSAR, which jointly span nearly three decades. We adopt a new approach that integrates GNSS to mitigate the atmospheric noise in the InSAR time series. Our analysis of multi-sensor InSAR data along with in-situ creepmeter measurements shows spatiotemporally varying transient behavior of surface creep along the SSAF. We develop laboratory-based rate-and-state friction models to investigate the controls on observed fault creep variation and how the shallow creep regime interacts with the seismogenic zone at depth. Our initial results show that shallow creep behaviors are prone to stress perturbations from tectonic/non-tectonic sources and that there is longer term transient fault creep behavior following large earthquakes.
Session: Searching for Fault Creep Over a Range of Timescales [Poster]
Type: Poster
Room: Evergreen Ballroom
Date: 4/20/2022
Presentation Time: 08:00 AM Pacific
Presenting Author: Zhen Liu
Student Presenter: No
Additional Authors
Zhen Liu Presenting Author Corresponding Author zhen.liu@jpl.nasa.gov Jet Propulsion Laboratory, Caltech |
Yingdi Luo bigbigluo@gmail.com JIFRESSE, University of California, Los Angeles |
Paul Lundgren paul.r.lundgren@jpl.nasa.gov Jet Propulsion Laboratory, Caltech |
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Investigation of Fault Creep Variability Along the Southern San Andreas Fault
Category
Searching for Fault Creep Over a Range of Timescales
Description