HR: 1330h
AN: V52B-0433    [PDF]
TI: Self Potential Investigation of the Qualibu Caldera, Soufriere, St. Lucia
AU: * Vichabian, Y
EM: yerv@erl.mit.edu
AF: Earth Resources Laboratory, Massachusetts Institute of Technology, E34-412, 42 Carleton Street, Cambridge, MA 02142 United States
AU: Morgan, D F
EM: morgan@erl.mit.edu
AF: Earth Resources Laboratory, Massachusetts Institute of Technology, E34-412, 42 Carleton Street, Cambridge, MA 02142 United States
AU: Sogade, J
EM: sogade@erl.mit.edu
AF: Earth Resources Laboratory, Massachusetts Institute of Technology, E34-412, 42 Carleton Street, Cambridge, MA 02142 United States
AB: The Qualibu Caldera, Soufriere, St. Lucia is a large topographic depression formed by downfaulting. The Caldera structure houses the Sulphur springs geothermal system as evidenced by natural manifestations of hot springs and micro-seismic activity. It has been long investigated for geothermal power generation using resisistivity, audiomagnetotellurics, gravity, microseismics, geochemical methods. Nine boreholes have also been drilled and tested. To add to the available dataset, 27 kilometers of SP data was collected in the Qualibou Caldera including a line adjacent to the emanations at Sulphur Springs. The area has dramatic elevation changes, thus a number of methodologies have been developed for topographic correction. Additionally the effects of tellurics, electrode polarization and noise were considered. The results show that SP is effective in locating faults and fractures. The negative SP regions are interpreted as upflows of hot fluids, typified by the known fumarole activity at the Sulphur Springs. The positive SP regions are areas of downflow or recharge. A newly identified negative SP anomaly might be a good geothermal prospect as it indicates upwardly migrating fluids.
DE: 8400 VOLCANOLOGY
DE: 8424 Hydrothermal systems (8135)
DE: 9820 Techniques applicable in three or more fields
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting