It is now widely recognized that convergent margins can experience accretion or subduction erosion with rates that depend on a variety of factors. The processes by which accretionary wedges grow are well documented, however the processes by which accretionary wedges erode are more enigmatic. This project will examine the Pacific Coast of Costa Rica and evaluate the current rates and the total shortening associated with active thrust faults in the inner fore arc of the Middle America Trench-faults that allow subduction erosion through underthrusting of the outer fore arc. Results will be used to evaluate whether there has been an arcward shift in the location of rapid shortening from the toe to the interior of the wedge for this area of rough crust and shallow subduction. This work is expected to increase knowledge about how accretaionary wedges erode.

Agency
National Science Foundation (NSF)
Institute
Division of Earth Sciences (EAR)
Type
Standard Grant (Standard)
Application #
9909375
Program Officer
David Fountain
Project Start
Project End
Budget Start
2000-01-01
Budget End
2003-12-31
Support Year
Fiscal Year
1999
Total Cost
$54,374
Indirect Cost
Name
Trinity University
Department
Type
DUNS #
City
San Antonio
State
TX
Country
United States
Zip Code
78212