Time-Domain Electromagnetics At Haleakala Volcano Area (Thomas, 1986)

GEOTHERMAL ENERGY

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Exploration Activity: Time-Domain Electromagnetics At Haleakala Volcano Area (Thomas, 1986)

Exploration Activity Details
Location	Haleakala Volcano Area
Exploration Technique	Time-Domain Electromagnetics
Activity Date
Usefulness	useful
DOE-funding	Unknown

Notes

Controlled-source electromagnetic soundings were found to be substantially more successful in the southwest rift than either the Schlumberger or the self-potential studies. This was largely due to the ability of time-domain methods to penetrate high-resistivity surface layers and thus to define lower-resistivity sections at depth. The results of this sounding study, which was conducted at elevations ranging from 75 to 497 m a.s.l., generally indicated moderate- to lowresistivity (6 - 7 ohm.m) sections to depths of 1 km on the lower rift zone and higher resistivities (12-16 ohm.m) beneath the upper rift zone (B. R. Lienert, pers. commun., 1984). These results were interpreted to indicate that temperatures in the range of 60degrees C and possibly as high as 96degrees C were present at depths of approximately 1 km near the coast and that a colder freshwater lens was present farther inland.

References

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