Sonic Waveform Data
IODP logging contractor: USIO/LDEO
Hole: U1354C
Expedition: 317
Location: Canterbury Basin (SW Pacific Ocean)
Latitude: 44 °50.8487' S
Longitude: 171° 47.2080 ' E
Logging date: January 2, 2010
Sea floor depth (driller's): 125 m DRF
Sea floor depth (logger's): 122 m WRF (DIT/DSI/GPIT/HNGS main pass)
Total penetration: 509.2 m DRF (384.2 m DSF)
Total core recovered: 133.37 m ( 42 % of cored section; no coring 0-65 m DSF)
Oldest sediment recovered: late lower Pliocene (4.0-4.3 Ma
Lithologies: mud, sandy mud, muddy sand, marl, sandy marl, clay
TOOL USED: DSI (Dipole Sonic Imager)
Remarks about the recording: The DSI was run with the medium frequency monopole, the standard frequency upper dipole and the low frequency lower dipole for downlog, and with the standard frequency monopole (others remain unchanged) for both repeat and main passes.
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.
LOWER DIPOLE MODE: measures shear wave slowness using firings of the lower 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: 2839 (downlog)
Number of rows: 2804 (main run)
Number of rows: 670 (main run)
The following files have been loaded:
DSI from DIT/DSI/GPIT/HNGS (downlog, pipe at 230.5 m WRF)
317-U1354C_mono_d.bin: 73.152-505.6632 m WRF
317-U1354C_ldip_d.bin: 73.152-505.6632 m WRF
317-U1354C_udip_d.bin: 73.152-505.6632 m WRF
DSI from DIT/DSI/GPIT/HNGS (main, pipe at 231 m WRF)
317-U1354C_mono_main.bin: 73.152-505.6632 m WRF
317-U1354C_ldip_main.bin: 73.152-505.6632 m WRF
317-U1354C_udip_main.bin: 73.152-505.6632 m WRF
DSI from DIT/DSI/GPIT/HNGS (repeat, recorded open hole)
317-U1354C_mono_rep.bin: 78.0288-505.206 m WRF
317-U1354C_ldip_rep.bin: 78.0288-505.206 m WRF
317-U1354C_udip_rep.bin: 78.0288-505.206 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 317.