[STT59-P06] 2-D seismic reflection survey across the Izu Bonin forearc seamounts using the R/V Kaimei
Keywords:seismic reflection survey, spatial aliasing, Izu Bonin forearc
Following are the data acquisition specifications of this survey: The shot spacing was 50 m and the record length was 13 s. The tuned air gun array had a maximum capacity of 10,600 cu in (approximately 173.7 L) and comprised 44 air guns. The standard air pressure was approximately 2,000 psi (approximately 14 MPa). The air gun array was kept 10 m below the sea surface throughout the experiment. During the air gun shooting, we towed a 1920-channel hydrophone streamer cable. The receiver interval was 3.125 m, and the cable was approximately 6 km long. The towing depth of the streamer cable was maintained at 12 m below the sea surface using depth controllers. Since the receiver interval and common midpoint interval of the Kaimei system are 1/2 to 1/4 times as narrow as those of general multichannel seismic reflection systems, seismic data of the Kaimei system should operate effectively for processing waveform data of spatial direction, such as the suppression of spatial aliasing, migration, and velocity filter, if we acquire good quality data.
We introduce an outline of multimode seismic systems of the R/V Kaimei, and report about a seismic reflection data across the Izu Bonin forearc seamounts.
Acknowledgments: We thank Mitsubishi Heavy Industries Ltd. and Marine Technology Center of JAMSTEC for their effort in acquiring a seismic data in a sea trial of the R/V Kaimei.