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    Plate interaction in the NE Caribbean subduction zone from continuous GPS observations

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    Article (1.053Mb)
    Additional file information (1.356Kb)
    Text S1: Description of data collection and processing. (164.6Kb)
    Table S1: Information about continuous GPS site locations, observation span and velocities in ITRF08 and Caribbean reference frame. (117.5Kb)
    Table S2: Comparison of various Caribbean Euler poles in a fixed North America reference frame. (121.5Kb)
    Table S3: Details about the modeled segments shown in Figure 1a. (99.87Kb)
    Figure S1: The 3-component time series for Anegada, British Virgin Islands, GPS site. (1.274Mb)
    Date
    2012-05-19
    Author
    ten Brink, Uri S.  Concept link
    Lopez-Venegas, Alberto M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5234
    As published
    https://doi.org/10.1029/2012GL051485
    DOI
    10.1029/2012GL051485
    Keyword
     Lesser Antilles; Puerto Rico trench; Virgin Islands; Earthquake hazard; Subduction zone coupling; Tsunami hazard 
    Abstract
    Kinematic similarities between the Sumatra and Puerto Rico Trenches highlight the potential for a mega-earthquake along the Puerto Rico Trench and the generation of local and trans-Atlantic tsunamis. We used the horizontal components of continuous GPS (cGPS) measurements from 10 sites on NE Caribbean islands to evaluate strain accumulation along the North American (NA) – Caribbean (CA) plate boundary. These sites move westward and slightly northward relative to CA interior at rates ≤2.5 mm/y. Provided this motion originates in the subduction interface, the northward motion suggests little or no trench-perpendicular thrust accumulation and may in fact indicate divergence north of Puerto Rico, where abnormal subsidence, bathymetry, and gravity are observed. The Puerto Rico Trench, thus, appears unable to generate mega-earthquakes, but damaging smaller earthquakes cannot be discounted. The westward motion, characterized by decreasing rate with distance from the trench, is probably due to eastward motion of CA plate impeded at the plate boundary by the Bahamas platform. Two additional cGPS sites in Mona Passage and SW Puerto Rico move to the SW similar to Hispaniola and unlike the other 10 sites. That motion relative to the rest of Puerto Rico may have given rise to seismicity and normal faults in Mona Rift, Mona Passage, and SW Puerto Rico.
    Description
    This paper is not subject to U.S. copyright. The definitive version was published in Geophysical Research Letters 39 (2012): L10304, doi:10.1029/2012GL051485.
    Collections
    • Energy and Geohazards
    Suggested Citation
    Geophysical Research Letters 39 (2012): L10304
     

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