Geologic structure between the Murray fracture zone and the Transverse Ranges

Marine Geology



The Murray fracture has been thought to extend ashore into the Transverse Ranges of California, but a geophysical study shows no evidence of structural continuity between these features. Instead, basement morphology typical of the Murray fracture zone ends where its known magnetic and bathymetric expression dies out. Similarly, east-west Transverse Range structures change direction so that they are parallel to the northwest trend of the coast rather than crossing the continental shelf and slope. The lack of continuity suggests an independent development of the Transverse Ranges since at least mid-Tertiary time along an older structural trend continuous with the Murray fracture zone. Possibly a fundamental lineament in the crust, an extension of the Murray, inactive since at least the mid-Tertiary, provided a convenient trend for development of the Transverse Ranges in response to deformation along the San Andreas fault system. The Murray fracture zone is thought by some authors to be a transform-fault. The transform-fault hypothesis alleviates some difficulties that arise in explaining the origin of the zone by transcurrent faulting but equivalent uncertainties seem to accompany the newer explanation.

    Publication type Article
    Publication Subtype Journal Article
    Title Geologic structure between the Murray fracture zone and the Transverse Ranges
    Series title Marine Geology
    DOI 10.1016/0025-3227(69)90020-6
    Volume 7
    Issue 6
    Year Published 1969
    Language English
    Publisher Elsevier
    Contributing office(s) Earthquake Science Center
    Description 23 p.
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