Micro-Earthquake At Coso Geothermal Area (2002-2005)

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Exploration Activity: Micro-Earthquake At Coso Geothermal Area (2002-2005)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Micro-Earthquake
Activity Date 2002 - 2005

Usefulness not indicated
DOE-funding Unknown

 
Exploration Basis
To improve understanding of the subsurface fracture system
 
Notes
A shear-wave splitting technique was applied on a set of high quality, locally recorded microearthquake (MEQ) data. Four major fracture directions have been identified from the seismograms recorded by the permanent 16-station down-hole array: N10- 20W, NS, N20E, and N40-45E, of which the first and the third are the most prominent. All orientations are consistent with the known strike of local sets of faults and fractures at depth and at the surface, as well as with previous analyses of seismic anisotropy in the region. Significant changes in shear-wave time delays, which are governed by crack density, have been detected from data recorded during five consecutive years between 1996 and 2000.


Additional References