Unused P-wave arrivals detected using the array located in OTN-2 were also analyzed further. Assuming that a small event that is detected solely at the OTN-2 array must occur in its immediate vicinity, we placed a hypothetical seismic source at the bottom of OTN-3. In the following, we calculated travel times of P waves to the sensors forming the OTN-2 array, thus obtaining a particular pattern of P-wave arrivals. We then scanned the catalog of unused OTN-2 P-wave arrivals for this particular pattern, and each matching set of detections was attributed to an event occurring in the vicinity of the OTN-3 well. We then calculated its magnitude by assuming that it occurred at the bottom of the OTN-3 injection well. This simple yet effective procedure allowed us to enhance the catalog by ~54,000 earthquakes with MW ≤ 0.1.

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