Site summaries (continued)

Site IBM-1B

Priority: Alternate
Position: 27.459276N, 134.508459E
Water depth (m): 4650
Target drilling depth (mbsf): 1600
Approved maximum penetration (mbsf): 1600
Survey coverage (track map; seismic profile): • Location map (Fig. AF1)
• Site track map (Fig. AF2)
• Multichannel seismic profiles (Fig. AF3)
Objective(s): Recover hemipelagic sediment, volcanic ash, and volcaniclastic turbidite filling the basin and penetrate into oceanic basement to determine its petrological, geochemical, age, and magnetic characteristics.
Drilling program: APC/XCB to refusal; RCB to 1600 mbsf
Logging program: Triple combo, FMS-sonic, VSI; potential third-party tool, such as UBI, MMM, or GBM (see “Logging/Downhole measurements strategy” for details)
Nature of rock anticipated: Mixed hemipelagic and volcaniclastic sediments, then igneous basement