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<br />Paradox Valley Seismic Network: Observations to Date-October 26, 1994. <br /> <br />1. Seismicity has accompanied all but one of the test periods of injection to date. The magnitude <br />and number of earthquakes associated with injection has increased with continued injection. <br />(Total number of events thus far is -225 with the largest having a magnitude of 2.6). <br /> <br />2. The migration of fluid from the well has diffused to the south and vertically downward <br />with each susequent injection period. <br /> <br />3. The trend and general location of the seismicity is consistent with failure on faults previously <br />inferred to exist in the target Leadville Formation from seismic reflection data. <br /> <br />4. A preliminary stress analysis suggests bottom hole pressures may be sufficient to cause failure <br />on intact rock with strengths as high as 140 bars as well as favorably oriented existing fractures. <br /> <br />5. Fault plane solutions for some events suggest fracturing sub-parallel to the NW-SE trend of <br />earthquakes. The largest event thus far however, suggests a different oreintation of potential fault <br />planes. This could suggest failure on planes with conjugate orientations may also begin to occur. <br /> <br />6. <br /> <br />001754 <br />