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    Seismic structures of the Calico fault zone inferred from local earthquake travel time modelling

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    Article (876.3Kb)
    Supporting information: Table 1. Local earthquakes used in this study. (26.87Kb)
    Date
    2011-06-16
    Author
    Yang, Hongfeng  Concept link
    Zhu, Lupei  Concept link
    Cochran, Elizabeth S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4741
    As published
    https://doi.org/10.1111/j.1365-246X.2011.05055.x
    DOI
    10.1111/j.1365-246X.2011.05055.x
    Keyword
     Body waves; Interface waves; Wave propagation 
    Abstract
    We analysed high-frequency body waves of local earthquakes to image the damage zone of the Calico fault in the eastern California shear zone. We used generalized ray theory and finite difference methods to compute synthetic seismograms for a low-velocity fault zone (FZ) to model the direct and FZ-reflected P and S traveltimes of local earthquakes recorded by a temporary array across the fault. The low velocity zone boundaries were determined by apparent traveltime delays across the fault. The velocity contrast between the fault zone and host rock was constrained by the traveltime delays of P and S waves and differential traveltimes between the direct and FZ-reflected waves. The dip and depth extent of the low velocity zone were constrained by a systematic analysis of direct P traveltimes of events on both sides of the fault. We found that the Calico fault has a ∼1.3-km-wide low velocity zone in which the P- and S-wave velocity decreased 40 and 50 per cent, respectively, with respect to the host rock. The low velocity zone dips 70° northeast and extends 3 km in depth.
    Description
    Author Posting. © The Authors, 2011. This article is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 186 (2011): 760-770, doi:10.1111/j.1365-246X.2011.05055.x.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Journal International 186 (2011): 760-770
     
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