P238 A NEW TECHNIQUE FOR IMPROVING SOURCE LOCATIONS OF MICROSEISMIC EVENTS AND RELATIVE TOOL ORIENTATIONS. Summary 1 The first step in the interpretation of microseismic events is to accurately estimate source locations. The obtained accuracy directly affects any consecutive analyses such as S-wave splitting CMT solutions and attenuation measurements. We present a data-windowing method to re-interpret source back-azimuths from P-wave hodograms which results in source locations of superior quality. The resulting azimuths can also be used to identify relative errors in the orientation of the geophone tools. Correcting for these misorientations reduces the standard deviation of the source azimuth by


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