Design and Processing Considerations For a Passive Seismic Survey , by Steve Cole

Passive seismology is seismology without the use of a controlled source to send sound waves into the earth. Interest in passive seismology originally grew out of the desire to detect and locate earthquakes and underground nuclear blasts. Teleseismic events contain information about the geology in the vicinity of the receivers, since the teleseismic energy will reflect, refract, and diffract off structures beneath the recording location. Microseismic activity near the recording location will provide energy that may be useful as well. Signal to noise ratios are typically small compared to controlled-source surveys, so sophisticated processing techniques are needed to overcome noise contamination and image the subsurface structures. This paper is a brief review of field and processing techniques that have been used in passive seismic experiments to date. Also included are some thoughts on how past work needs to be supplemented to meet the particular requirements of exploration seismology.


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