(Table 1) Sr-isotope values of representative sediment samples from ODP sites at the Costa Rica margin

Two sealed borehole hydrologic observatories (CORKs) were installed in two active hydrogeochemical systems at the Costa Rica subduction zone to investigate the relationship between tectonics, fluid flow, and fluid composition. The observatories were deployed during Ocean Drilling Program (ODP) Leg 205 at Site 1253, ~ 0.2 km seaward of the trench, in the upper igneous basement, and at Site 1255, ~ 0.5 km landward of the trench, in the décollement. Downhole instrumentation was designed to monitor formation fluid flow rates, composition, pressure, and temperature. The two-year records collected by this interdisciplinary effort constitute the first co-registered hydrological, chemical, and physical dataset from a subduction zone, providing critical information on the average and transient state of the subduction thrust and upper igneous basement. The continuous records at ODP Site 1253 show that the uppermost igneous basement is highly permeable hosting an average fluid flow rate of 0.3 m/yr, and indicate that the fluid sampled in the basement is a mixture between seawater (~ 50%) and a subduction zone fluid originating within the forearc (~ 50%). These results suggest that the uppermost basement serves as an efficient pathway for fluid expelled from the forearc that should be considered in models of subduction zone hydrogeology and deformation. Three transients in fluid flow rates were observed along the décollement at ODP Site 1255, two of which coincided with stepwise increases in formation pressure. These two transients are the result of aseismic slip dislocations that propagated up-dip from the seismogenic zone over the course of ~ 2 weeks terminating before reaching ODP Site 1255 and the trench. The nature and temporal behavior of strain and the associated hydrological response during these slow slip events may be an analog for the response of the seaward part of the subduction prism during or soon after large subduction zone earthquakes.

Estuary numbers /

"September 1989."

MAC3D : numerical model for reservoir hydrodynamics with application to bubble diffusers /

"July 1998."

Tylers Beach, Virginia, Dredged Material Plume Monitoring Project : 27 September to 4 October 1991 /

At head of title: "Dredging Research Program."

The turbulent boundary layer with variable Prandtl number.

Mode of access: Internet.

The motion of turbulent vortex-pairs in homogeneous and density stratified media /

Photocopy of microfilm. Springfield, Va. : National Technical Information Service, [1979]

Recirculation principle for ground effect machine two-dimensional tests.

"Task 9R99-01-005-04. Contract DA 44-177-TC-710."

Thermal agitation and turbulence.

"Prepared for the United States Atomic Energy Commission under AEC Contract AT(04-3)-321, Plasma Turbulence Research."

In-flight simulation, theory and application,

"To be presented to the Fluid Dynamics Panel of the Advisory Group for Aeronautical Research and Development of the North Atlantic Treaty Organization, 10 April through 17 April 1961."

Shock tube driver techniques and attenuation measurements,

"Contract AF 18(603)-10, Mechanics Division, Air Force Office of Scientific Research, ARDC, Washington."

Low-density research in the hypersonic shock tunnel

"The experimental study reported here has been performed under the sponsorship of the Fluid Dynamics Branch, Aeronautical Research laboratories of the U.S. Air Force Air Research and Development Command, Contract no. AF 33(616)-6025."

Proceedings.

Mode of access: Internet.

Proceedings.

Mode of access: Internet.

R2D2 : a Fortran program for two-dimensional chemically reacting, hyperthermal, internal flows.

"January 1980."

Research on annular nozzle type ground effect machine operating over water : description of wake patterns /

Mode of access: Internet.