SEGJ Technical Conference

Separation of passive seismic signals from vibrations generated by two active seismic sources (ACROSS)

Abstract We demonstrate that both microseismic and ACROSS (Accurately Controlled, Routinely Operated Signal System) data can be extracted using the same permanent receiver array. We perform continuous data acquisition with two ACROSS sources in Kashiwazaki, Japan to evaluate recoverable passive seismic signals after the suppression of ACROSS data. Signals from ACROSS can be removed by subtracting "weight-averaged" ACROSS data, and subtle motions from passive seismic can be uncovered. The ground motions of lower than 10 micro kines (10-7 m/s) are extracted at 70 m or greater distance away from ACROSS sources, indicating that continuous microseismic observation is possible at most of the receiver locations.