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doi:10.2204/iodp.sp.346.2013

Seismic studies and site survey data

Seismic and acoustic profiles of the sediments to be drilled in the Japan and East China Seas were surveyed during Cruise KR05-09 to the northern part of the Japan Sea (26–31 July 2005), Cruise KY07-04 to the northern part of the East China Sea (24 February–1 March 2007), Cruise KR07-12 to the northern part of the East China Sea and southern to central part of the Japan Sea (8–25 September 2007), and Cruise KT08-10 to the northern part of the East China Sea (24–29 May 2008). During the KR05-09 cruise, four single-channel seismic (SCS) lines (including one cross line over the site), subbottom profiling (SBP), multibeam, and one piston core (PC-1) were taken at proposed Site JB-2A, and five SCS lines (including one cross line over the site), SBP, multibeam, and one piston core (PC-2) were taken at proposed Site JB-3A. During the KY07-04 cruise, eight SCS lines (including two cross lines over the two sites), SBP, and multibeam were taken at proposed Sites ECS-1A and ECS-1B, and two piston cores (PC-01 and PC-02) were taken at proposed Site ECS-1A. During the KR07-12 cruise, five multichannel seismic (MCS) lines (including one cross line over the site), SBP, multibeam, and one piston core (PC-01) were taken at proposed Site ECS-1B; three SCS lines (including one cross line over the site), SBP, multibeam, and one piston core (PC-03) were taken at proposed Site YB-1A; three SCS lines (including one cross line over the site), SBP, multibeam, and one piston core (PC-07) were taken at proposed Site YB-3A; and four SCS lines including 1 cross line over the site, SBP, multibeam, and two piston cores (PC-05, 08) were taken at Site YR-1A. During the KT08-10 cruise, dredge and three piston cores (PC-01, PC-02, and PC-03) were taken at proposed Site ECS-1B. About 2530 line-km of MCS data were obtained in 2004 aboard the R/V Tamhae II (Korea Institute of Geoscience and Mineral Resources) in the eastern part of the South Korea Plateau using an 80-channel streamer and air gun sources. An east–west seismic line (04GH-12) of MCS crosses over proposed Site UB-1. Detailed multibeam bathymetry and SBP data over the site were obtained by the National Oceanographic Research Institute of Korea from 1996 to 1997. A few piston cores (05GCRP-21, 05GCRP1-9, and 05GCRP1-18) were retrieved from the eastern part of the South Korea Plateau aboard the Tamhae II in 2005.

Proposed Sites JB-1, YB-3, and YB-2 will be re-drills of ODP Legs 127 and 128 Sites 794, 797, and 798, respectively. The supporting site survey data for this expedition are archived in the IODP Site Survey Data Bank.

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