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    Earthquake swarms driven by aseismic creep in the Salton Trough, California

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    Article (1.847Mb)
    Additional file information (1.143Kb)
    Table S1: Relocated seismicity for 1981 swarm, standard hypoDD format. (118.6Kb)
    Table S2: Relocated seismicity for 2005 swarm, standard hypoDD format. (156.4Kb)
    Table S3: InSAR data used in inversions: x,y, interferogram. (503.4Kb)
    Date
    2007-04-10
    Author
    Lohman, Rowena B.  Concept link
    McGuire, Jeffrey J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3621
    As published
    https://doi.org/10.1029/2006JB004596
    DOI
    10.1029/2006JB004596
    Keyword
     Aseismic slip; Salton Trough; Seismic swarms 
    Abstract
    In late August 2005, a swarm of more than a thousand earthquakes between magnitudes 1 and 5.1 occurred at the Obsidian Buttes, near the southern San Andreas Fault. This swarm provides the best opportunity to date to assess the mechanisms driving seismic swarms along transform plate boundaries. The recorded seismicity can only explain 20% of the geodetically observed deformation, implying that shallow, aseismic fault slip was the primary process driving the Obsidian Buttes swarm. Models of earthquake triggering by aseismic creep can explain both the time history of seismic activity associated with the 2005 swarm and the ∼1 km/h migration velocity exhibited by this and several other Salton Trough earthquake swarms. A combination of earthquake triggering models and denser geodetic data should enable significant improvements in time-dependent forecasts of seismic hazard in the key days to hours before significant earthquakes in the Salton Trough.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 112 (2007): B04405, doi:10.1029/2006JB004596.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of Geophysical Research 112 (2007): B04405
     

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