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GEOREF RECORD

Gravity anomalies and structure of the West Indies, Part 1

William Maurice Ewing and John Lamar Worzel
Gravity anomalies and structure of the West Indies, Part 1
Bulletin of the Geological Society of America (February 1954) 65 (2): 165-173

Abstract

Seismic-refraction results and gravity data have been used to deduce the crustal structure from the ocean basin north of the Puerto Rico trench to the Caribbean Sea. It is concluded that the Mohorovicic discontinuity (characterized by compressional-wave velocities of about 8 km/sec) lies at 9 km. below sea level under the ocean basin, 12 km under the Caribbean Sea, at about 16 km under the trench, and at slightly shallower depth under Puerto Rico. The large negative gravity anomaly is attributed to a great thickness of sediments in the trench rather than to a "sialic root" due to a down-buckle of the crust under the trench, as formerly thought.


ISSN: 1050-9747
Coden: BUGMAF
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 65
Serial Issue: 2
Title: Gravity anomalies and structure of the West Indies, Part 1
Pages: 165-173
Published: 195402
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1959-009354
Categories: OceanographyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N17°49'60" - N18°30'00", W67°15'00" - W65°40'00"
N18°00'00" - N20°15'00", W68°40'00" - W60°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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