Title :
Improvement of air gun array´s width for a quasi-3D multi-channel seismic survey by single streamer cable
Author :
Hosoya, Shinichi ; Okita, Shigeru ; Momma, Hirayasu
Author_Institution :
Nippon Marine Enterprises Ltd., Kanagawa, Japan
Abstract :
In order to understand the deep structure of the Earth´s crust Japan Marine Science and Technology Center (JAMSTEC) has been conducting site surveys in the adjacent seas of Japan using a multi-channel seismic survey system (MCS). Nippon Marine Enterprises Ltd. (NME), which was established in 1980, operates four research vessels, a deep submersible Shinkai 2000 and three deep ROVs owned by JAMSTEC. In 1997, JAMSTEC contracted NME to operate the MCS and in 1999 one hundred ocean bottom seismometers (OBSs) were added. The R/V Kairei has installed on board an air-gun system, the largest in the world, with a 200-litre capacity, and 5000-metre long streamer cables to carry out the MCS reflection surveys. Each gun has a capacity of 4.6 litres and pressure of 140 kgf/cm2 with a total of 8 guns. An air-gun system is expanded by two paravanes, one paravane is towed from the starboard side while another is towed from the port side.
Keywords :
oceanic crust; oceanographic equipment; remotely operated vehicles; seismology; seismometers; submarine cables; underwater vehicles; 100 m; 5000 m; 65 m; 92 m; Earth crust; JAMSTEC; Japan Marine Science and Technology Center; Nippon Marine Enterprises Ltd.; R/V Kairei; ROV; Shinkai 2000; air gun array width; deep structure; deep submersible; drag force; multi-channel seismic survey system; ocean bottom seismometer; quasi-3D multichannel seismic survey; reflection surveys; single streamer cable; site surveys; umbilical cable; Geoscience; Guns; Marine technology; Marine vehicles; Oceans; Remotely operated vehicles; Testing; Umbilical cable; Underwater vehicles; Wire;
Conference_Titel :
OCEANS '02 MTS/IEEE
Print_ISBN :
0-7803-7534-3
DOI :
10.1109/OCEANS.2002.1191896
