Ground Gravity Survey At Mokapu Penninsula Area (Thomas, 1986)

GEOTHERMAL ENERGY

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Exploration Activity: Ground Gravity Survey At Mokapu Penninsula Area (Thomas, 1986)

Exploration Activity Details
Location	Mokapu Penninsula Area
Exploration Technique	Ground Gravity Survey
Activity Date
Usefulness	not indicated
DOE-funding	Unknown

Notes

A separate geophysical analysis performed on the Koolau caldera area (Kauahikaua, 1981 a) synthesized existing self-potential, gravity, seismic and aeromagnetic data with recently acquired resistivity soundings. An analysis of the observed remnant magnetization within the caldera complex suggested that subsurface temperatures ranged from less than 300degrees C to no more than 540degrees C. The resistivity data indicated that the electrical basement, to a depth of 900 m, had resistivities ranging from 42 ohm.m to more than 1000 ohm.m, which is considered to be within the expected range for basalts (or alteration suites) saturated by cold, fresh to saline water. No substantial effects on the resistivities were observed that were interpreted to be due to thermal influences. In the light of the geophysical data just reviewed, it may be assumed that if a thermal resource is associated with the Koolau caldera, its temperature is probably very low.

References

• Donald M. Thomas (1 January 1986) Geothermal Resources Assessment In Hawaii