Item talk:Q228762

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Project",
 "url": "https://www.usgs.gov/centers/whcmsc/science/caribbean-tsunami-and-earthquake-hazards-studies-seafloor-map",
 "headline": "Caribbean Tsunami and Earthquake Hazards Studies- Seafloor Map",
 "datePublished": "August 22, 2018",
 "author": [
   {
     "@type": "Person",
     "name": "Uri ten Brink, PhD",
     "url": "https://www.usgs.gov/staff-profiles/uri-ten-brink",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0001-6858-3001"
     }
   },
   {
     "@type": "Person",
     "name": "Claudia Flores",
     "url": "https://www.usgs.gov/staff-profiles/claudia-flores",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0003-0676-7061"
     }
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "To help understand the origin of the unusual bathymetry, gravity, and vertical tectonics of the plate boundary and to provide constraints for hazard assessment, the morphology of the entire 770-km-long trench from the Dominican Republic in the west to Anguilla in the east was mapped with multibeam echosounder during three cruises in 2002 and 2003. Parts of the Puerto Rico Trench were previously surveyed with side-scan sonar and multibeam echosounder, often at lower resolution and with line orientation and spacing that did not provide complete bathymetric coverage."
   },
   {
     "@type": "TextObject",
     "text": "Detailed seafloor mapping of complete geological provinces, such as the one reported here, provide critical perspective on their origin and development and provide base maps for studies in other disciplines. Here and in related publications, the maps are used to investigate the causes of the subsidence and deformation of this unusually deep part of the Atlantic Ocean and to identify earthquake and tsunami hazards. Earthquake hazard from strike-slip motion in the forearc may be small, although other potential sources of earthquakes in the region may exist.Tsunami hazard to the northern coast of Puerto Rico and the Virgin Islands from submarine slope failures appears to be high."
   },
   {
     "@type": "TextObject",
     "text": "The trench can be divided into two parts at about 65-66W.The western part includes the deepest sector of the trench, and is associated with the most oblique convergence.This sector is 10-15 km wide and 8300-8340 m deep relative to mean sea level (figure). It is remarkably flat and is covered by nonreflective pelagic sediments.Seismic profiles show it to be underlain by rotated blocks of the NOAM plate that indicate trench subsidence.The unusual depth extends southward over parts of the forearc. The trench floor narrows to the west and abruptly shallows to 4700 m as it turns into the Hispaniola Trench, where convergence is more perpendicular. The eastern part of the trench is shallower by 700 m and more rugged than the deep western part.The subducting NOAM plate is observed in seismic lines to be broken into blocks, but the descending blocks are not rotated."
   },
   {
     "@type": "TextObject",
     "text": "The bathymetry (seafloor topography) data were collected using the SeaBeam 2112 multibeam system aboard the National Oceanic and Atmospheric Administration (NOAA) ship Ron Brown, with sufficient swath overlap and proper line orientation for hydrographic survey.The data were gridded at 150-m grid size following resolution tests.Vertical resolution is estimated to be 0.5-1% of the water depth (10-80 m; L.Mayer, oral communication,2003). Backscatter mosaic images derived from the multibeam bathymetry data aided in interpretation.The total mapped area is 100,000 km2, slightly smaller than the area of the state of Virginia."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Woods Hole Coastal and Marine Science Center",
   "url": "https://www.usgs.gov/centers/whcmsc"
 },
 "about": [
   {
     "@type": "Thing",
     "name": "Tsunamis"
   },
   {
     "@type": "Thing",
     "name": "Energy"
   },
   {
     "@type": "Thing",
     "name": "Geology"
   },
   {
     "@type": "Thing",
     "name": "Ocean"
   },
   {
     "@type": "Thing",
     "name": "Tsunamis | Los maremotos"
   },
   {
     "@type": "Thing",
     "name": "Science Technology"
   },
   {
     "@type": "Thing",
     "name": "Caribbean"
   },
   {
     "@type": "Thing",
     "name": "Environmental Health"
   },
   {
     "@type": "Thing",
     "name": "Coasts"
   },
   {
     "@type": "Thing",
     "name": "Maps and Mapping"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analyses"
   },
   {
     "@type": "Thing",
     "name": "Natural Hazards"
   },
   {
     "@type": "Thing",
     "name": "Water"
   },
   {
     "@type": "Thing",
     "name": "Earthquakes"
   },
   {
     "@type": "Thing",
     "name": "Information Systems"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analysis"
   }
 ]

}