IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA

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Conference Proceedings: IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA

Abstract
Geothermal microearthquakes, and the seismic waves they generate, provide a rich source of information about physical processes associated with Enhanced Geothermal Systems (EGS) experiments and other geothermal operations. With support from the Dept. of Energy, we are developing several software packages to enhance the utility of microearthquake data in geothermal operations and EGS experiments. Two of these are: 1. Enhanced relative hypocenter location techniques. Relative relocations produce threedimensional images showing in fine detail the geometry of microearthquake clusters, and thus failure zones. These images are valuable for diagnosing failure mechanisms and for identifying promising drilling targets, but they suffer from a fundamental weakness: they are relatively insensitive to absolute locations and generally yield cluster locations with excellent structural detail but poorly located as a whole. We are refining the hypocenter-location program hypocc to use both absolute and differential arrival times, in order to constrain the absolute locations of clusters in addition to the relative locations of the earthquakes in them. hypocc can use three-dimensional ray tracing to take full advantage of detailed information about local structure when it is available, and can also use simpler (e.g., one-dimensional) models for less well-constrained cases...

Authors 
Julian, B.R.; Foulger and G.R.








Published 
PROCEEDINGS, Thirty-Fifth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 1-3, 2010, 1/1/2010





DOI 
Not Provided
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Citation

Julian, B.R.; Foulger, G.R.. 1/1/2010. IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA. Proceedings of (!) ; (!) : PROCEEDINGS, Thirty-Fifth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 1-3, 2010.


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  1. Coso Geothermal Area
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