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    Microearthquake activity on the Orozco Fracture Zone : preliminary results from Project ROSE

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    WHOI 81-79.pdf (3.913Mb)
    Date
    1981-09
    Author
    Ewing, John I.  Concept link
    Purdy, G. Michael  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10278
    DOI
    10.1575/1912/10278
    Keyword
     Natural disasters; Seismology 
    Abstract
    We present preliminary hypocenter determinations for 52 earthquakes recorded by a large multiinstitutional network of ocean bottom seismometers and ocean bottom hydrophones in the Orozco Fracture Zone in the eastern Pacific during late February to mid-March 1979. The network was deployed as pan of the Rivera Ocean Seismic Experiment, also known as Project ROSE. The Orozco Fracture Zone is physiographically complex, and the pattern of microeanhquake hypocenters at least partly reflects this complexity. All of the well-located epicenters lie within the active transform fault segment of the fracture zone. About lialf of the recorded earthquakes were aligned along a narrow trough that extends eastward from the northern rise crest intersection in the approximate direction of the Cocos-Pacific relative plate motion; these events appear to be characterized by strike-slip faulting. The second major group of activity occurred in the central portion of the transform fault; the microearthquakes in this group do not display a preferred alignment parallel to the direction of spreading, and several are not obviously associated with distinct topographic features. Hypocentral depth was well resolved for many of the earthquakes reported here. Nominal depths range from 0 to 17 km below the seafloor.
    Description
    Also published as: Journal of Geophysical Research 86 (1981): 3783- 3790
    Collections
    • Geology and Geophysics (G&G)
    • WHOI Technical Reports
    Suggested Citation
    Ewing, J. I., & Purdy, G. M. (1981). Microearthquake activity on the Orozco Fracture Zone: preliminary results from Project ROSE. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10278
     
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