Abstract
The double-difference (DD) location method has long been applied for locating a cluster of earthquakes, with data recorded at surface seismic stations. We extend the approach for locating a cluster of microseismic events with data recorded from a single monitoring well. Synthetic tests indicate that the DD method for the downhole microseismic monitoring is sensitive to picking errors, and results are reasonable in relative event locations, but poor in absolute locations. We modify the approach by using cross traveltime difference between P-wave arrival of one event and S-wave arrival of another event for inversion instead of traveltime differences of the same phase. Our simulation indicates that this Cross Double-Difference (CDD) method can reduce the dependence on the initial guess for event locations and also improve accuracy of microseismic event cluster in both relative and absolute locations. This is because the cross double-difference quantity is much larger than the double difference of the same phase and less affected by picking errors.
Published Version
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