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Browse MARGINS Awards in reverse chronological order after start date (most recent first):

Collaborative Research: Structure of the Nicaragua/Costa Rica Subduction Zone: A Framework for the Subduction Factory and Seismogenic Zone Initiatives

MARGINS Focus Area Subduction Factory, Seismogenic Zone
NSF Org OCE
Latest Amendment Date September 9, 1999
Award Number 9909859
Award Instrument Standard Grant
Program Manager Bruce T. Malfait
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES
Start Date January 1, 2000
Expires December 31, 2002 (Estimated)
Expected Total Amount $148,118 (Estimated)
Investigator Eli A. Silver (Principal Investigator current)
Sponsor U of Cal Santa Cruz
1156 High Street
Santa Cruz, CA 95064
NSF Program 5720 OCEAN DRILLING PROGRAM
Field Application 0204000 Oceanography
Abstract Recommended Project is for a multichannel seismic (MCS) survey of the subducting ocean crust off the coasts of Nicaragua and Costa Rica in support of both SEIZE and Subduction Factory objectives in this Margins program study area. The primary objective is to characterize the changing structural nature of the subducting Cocos plate, and to try to relate these changes to known chemical segmentation of the volcanic arc, best shown by ratios such as Ba/La that reflect relative changes in material input into the subduction zone. The MCS survey will be supplemented by three wide-angle, ocean bottom hydrophone (OBH) refraction lines, two perpendicular and one parallel to the trench, as well as by Hydrosweep swath bathymmetry, gravity, and magnetics data. This proposed study is part of a larger, international effort, using the German research vessel R/V Sonne. The MCS and Hydrosweep surveys would be conducted aboard the R/V Maurice Ewing, using its 6 km-long streamer. The R/V Sonne will be used to supply, deploy and recover the OBH's, which will themselves be supplied by GEOMAR. ***