9403587 Dorman This experiment is designed to provide direct observational constraints on the distribution of melt and the pattern of upwelling beneath a mid-ocean ridge. Studies of electromagnetic and seismic wave propagation in the mantle with arrays of oceanbottom instruments will furnish measurements that can be inverted to find horizontal and vertical variations in velocity and conductivity structure that can be used to test theoretical models of flow. An array of 47 ocean-bottom seismometers will be deployed for six months on the East Pacific Rise at about 17 degrees south to record teleseismic and regional earthquake sources. P and S waves, as well as other bady wave phases and Love and Rayleigh surface waves recorded by the array will be used to probe lateral variations in mantle structure to a depth of 100 to 200 km and out to several hundred km from the ridge axis. The main goal is to establish whether there is a narrow region of high melt concentration and low seismic velocities directly beneath the ridge axis and to map its vertical and horizontal extent. Another goal is to constrain the pattern of upwelling. ***

Agency
National Science Foundation (NSF)
Institute
Division of Ocean Sciences (OCE)
Application #
9403587
Program Officer
David E. Epp
Project Start
Project End
Budget Start
1995-05-01
Budget End
2001-04-30
Support Year
Fiscal Year
1994
Total Cost
$735,823
Indirect Cost
Name
University of California-San Diego Scripps Inst of Oceanography
Department
Type
DUNS #
City
La Jolla
State
CA
Country
United States
Zip Code
92093