Receiver static corrections from passive seismic data , by Steve Cole

A stack power optimization method is used to compute receive station statics using data from a passive seismic survey. The method relies on the presence of vertically incident plane wave energy in the data. The computed statics are those time shifts that would best align such vertically incident events. Two problems that affect this algorithm are the effect of random noise (and coherent but not vertically incident energy) on the cross- correlation procedure that is central to the processing, and the liability to distinguish between true statics and arrival time differences caused by energy that is not vertically incident. Using more data in the crosscorrelation helps to overcome the noise problem somewhat. To determine the effectiveness of the method, I process passive data recorded during two different recording periods independently. The results show that there is some agreement between the two statics solutions obtained, but not enough that either the problem of interfering noise or of non-vertical incidence is completely overcome. The results suggest that multichannel filtering to enhance vertically incident energy relative to the incoherent and coherent noise is necessary if the method is to be able to "see" through the noise better.


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