<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>G.R. Foulger</dc:contributor>
  <dc:contributor>K. Richards-Dinger</dc:contributor>
  <dc:creator>B.R. Julian</dc:creator>
  <dc:date>2004</dc:date>
  <dc:description>&lt;p&gt;The permanent 16-station network of three-component digital seismometers at the Coso geothermal area, California, supplemented by 14 temporary instruments deployed in connection with the DOE Enhanced Geothermal Systems (EGS) Project, provides high-quality microearthquake (MEQ) recordings that are well suited to monitoring a producing geothermal area. We are currently using these data to investigate structure and active processes within the geothermal reservoir by applying three advanced methods: a) high-precision MEQ hypocenter location; b) time-dependent tomography; c) complete (moment tensor) MEQ source mechanism determination. Preliminary results to date resolve seismogenic structures in the producing field more clearly than is possible with conventional earthquake-location techniques. A shallow part of the producing field shows clear changes in the ratio of the seismic wave speeds, &lt;i&gt;V&lt;sub&gt;p&lt;/sub&gt;&lt;/i&gt;/&lt;i&gt;V&lt;sub&gt;s&lt;/sub&gt;&lt;/i&gt;, between 1996 and 2002, which are probably related to physical changes in the reservoir caused by fluid extraction.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:language>en</dc:language>
  <dc:publisher>Geothermal Resources Council</dc:publisher>
  <dc:title>The Coso geothermal area: A laboratory for advanced MEQ studies for geothermal monitoring</dc:title>
  <dc:type>text</dc:type>
</oai_dc:dc>