A Workshop sponsored by the
U.S. Geological Survey
at the Colegio de Ingenieros y Agrimensores, San Juan, Puerto Rico, March 23-24, 1999
Executive Summary
State of Knowledge
Working Group Reports:
 Marine geology/ geophysics
 Earthquake seismology
 Societal concerns
Workshop Goals
the Physiographic Context
Figure 1. Morphology of the northeastern Caribbean region, viewed from the east. The plate boundary zone between the North American and Caribbean plates is delimited by the Puerto Rico trench to the north of the islands and the Anegada Trough and Muertos Trough to the south. Color shaded bathymetry prepared by USGS. Digital data courtesy of Troy Holcombe and Lisa Taylor, National Geophysical Data Center, Boulder CO, from International Bathymetric Chart of the Caribbean Sea and the Gulf of Mexico, sheet 1-09, published by Instituto Nacional de Estadística, Geografía e Informática, México, 1992.

U.S. Geological Survey Open-file Report 99-353
Convenors and Editors
Uri ten Brink
William Dillon

U.S. Geological Survey
Coastal and Marine Geology Program
Woods Hole, MA 02543
Arthur Frankel
Charles Mueller

U.S. Geological Survey
Earthquake Hazard Program
P.O. Box 25046, MS 966
Lakewood, CO 80225
Rafael W. Rodriguez
U.S. Geological Survey
Water Resources Division
Puerto Rico District Office
GSA Center
651 Federal Drive, Suite 400-15
Guaynabo, PR 00965
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. The use of trade, product, or industry names in this report is for descriptive or location purposes only and does not constitute endorsement of products by the U.S. Government. Opinions and conclusions expressed herein do not necessarily represent those of the USGS.

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