Sonic Waveform Data
IODP logging contractor: USIO/LDEO
Hole: U1359D
Expedition: 318
Location: Wilkes Land Margin (Antarctic Ocean)
Latitude: 64° 54.2596' S
Longitude: 143° 57.5624 ' E
Logging date: February 22-23, 2010
Sea floor depth (driller's): 3023 m DRF
Sea floor depth (logger's): 3019.5 m WRF
Total penetration: 3625.2 m DRF (602.2 m DSF)
Total core recovered: 450 m ( 59.9 % of cored section)
Oldest sediment recovered: Middle Miocene
Lithology: Diatomaceous silty claystones and finely-laminated claystones
TOOL USED: DSI (Dipole Sonic Imager)
Recording mode: Monopole P&S, Upper Dipole mode.
Remarks about the recording: none.
MONOPOLE P&S MODE: measures compressional and hard-rock shear slowness. The monopole transmitter is excited by a high-frequency pulse, which reproduces conditions similar to previous sonic tools.
UPPER DIPOLE MODE: measures shear wave slowness using firings of the upper dipole transmitter.
Acoustic data are recorded in DLIS format. Each of the eight waveforms generally consists of 512 samples (256 in cross-dipole mode), each recorded every 10 (monopole P&S) and 40 microsec (all dipole and Stoneley modes), at depth intervals of 15.24 cm (6 inches). The original data in DLIS format is first loaded on a Sun system using GeoFrame software. The packed waveform data files are then converted into ASCII and finally binary format.
Number of columns: 4097
Number of rows: 4107 (downlog)
Number of rows: 3298 (pass 1)
Number of rows: 3281 (pass 2)
Number of rows: (pass 3)
The following files have been loaded:
DSI from FMS/DSI/GPIT/HNGS (Downlog, drill pipe at 3122.5 m WRF)
318-U1359D_mono_d.bin: 3125.4-3627.9 m WRF
DSI from FMS/DSI/GPIT/HNGS (Pass 1, recorded open hole)
318-U1359D_mono_p1.bin: 3125.4-3627.9 m WRF
318-U1359D_udip_p1.bin: 3125.4-3627.9 m WRF
DSI from FMS/DSI/GPIT/HNGS (Pass 2, recorded open hole)
318-U1359D_mono_p1.bin: 3125.7-3625.6 m WRF
318-U1359D_udip_p1.bin: 3125.7-3625.6 m WRF
DSI from FMS/DSI/GPIT/HNGS (Pass 3, pipe at 3121 m WRF)
318-U1359D_mono_p3.bin: 3007.6-3625.6 m WRF
318-U1359D_udip_p3.bin: 3007.6-3625.6 m WRF
The sonic waveform files are not depth shifted to a reference run or to the seafloor. For depth shift to the sea floor, please refer to the DEPTH SHIFT section in the standard data processing documentation file.
Additional information about the drilling and logging operations can be found in the Operations and Downhole Measurements sections of the expedition report, Proceedings of the Integrated Drilling Program, Expedition .