Micro-Earthquake At Coso Geothermal Area (1974)

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Exploration Activity: Micro-Earthquake At Coso Geothermal Area (1974)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Micro-Earthquake
Activity Date 1974

Usefulness useful
DOE-funding Unknown

Exploration Basis
To determine the background level of seismicity before any drilling related to production takes place.
Two different arrays of portable high-gain seismographs were installed- measurements taken over thirty three days; completed 9 calibration blasts. The microearthquake activity changed considerably including days which had only a few events while others had as many as 100 or more distinct local events; more than two thousand events with S-P times of less than three seconds were detected; observed low value for Poisson's ratio which indicated that the Coso geothermal system is a vapor-dominated system rather than a hot-water system.

Additional References