Principal Investigators: Kirk McIntosh, Thomas A. Shipley, Nathan L. Bangs

Funded by: National Science Foundation - OCE-9301696

Researchers are studying fluid pathways in accretionary prisms by using existing two-dimensional and three-dimensional seismic reflection data sets from the Costa Rica convergent margin in an integrated, three part project. A large effort will be undertaken to map the network of potential fluid conduits as indicated by the system of faults in the 2D and 3D seismic data sets. A model is in development to show the seismic response of prism reflectors to interpret where fluids may be present along conduits, and how and where fluids are involved in the structural development of the prism. Researchers will seek to improve our velocity estimates and seismic images of selected, critical pieces of the data needed for interpretation of fluid sources and migration pathways within the prism. Collectively these objectives will comprise a comprehensive effort to delineate the mechanics of fluid migration and dewatering activity in the Costa Rica accretionary prism. By integrating the results from these efforts, a detailed image of this prism's fluid pathways will be produced. Results will be used to make testable hypotheses regarding fluid source regions and migration paths and place constraints on the behavior of fluids that govern thrusting, and trigger underplating.