Sonic Waveform Data
IODP logging contractor: USIO/LDEO
Hole: U1391C
Expedition: 339
Location: West Iberia (eastern Atlantic Ocean)
Latitude: 37° 21.5286' N
Longitude: 9° 24.6468' W
Logging date: January 15, 2012
Sea floor depth (driller's): 1085 m DRF
Sea floor depth (logger's): 1086 m WRF (HRLA/HLDS/EDTC-B/HNGS Uplog)
Sea floor depth (logger's): 1085 m WRF (FMS/DSI/GPIP/EDTC-B Pass 2)
Total penetration: 1756.5 m DRF (671.5 m DSF)
Total core recovered: 269.02 m ( 81.2 % of cored section)
Oldest sediment recovered: Pliocene
Lithology: nannofossil mud, silty mud.
TOOL USED: DSI (Dipole Sonic Imager)
Recording mode: Monopole P&S, and Upper and Lower Dipole.
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.
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 consists of 512 samples, each recorded every 10 (monopole P&S) and 40 microsec (dipole 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 run through a GeoFrame module that applies a gain correction and then converted into ASCII and finally binary format.
Number of columns: 4097
Number of rows: 4557 (downlog)
Number of rows: 4457 (pass 1)
Number of rows: (pass 2)
The following files have been loaded:
DSI from FMS/DSI/GPIT/EDTC-B (Downlog, drill pipe at 1182.5 m WRF)
339-U1391C_mono_d.bin: 1021.69-1716.02 m WRF
339-U1391C_ldip_d.bin: m WRF
339-U1391C_udip_d.bin: 1021.99-1716.33 m WRF
DSI from FMS/DSI/GPIT/EDTC-B (Pass 1, drill pipe at 1182 at m WRF)
339-U1391C_mono_p1.bin: 1746.50-1067.40 m WRF
339-U1391C_ldip_p1.bin: m WRF
339-U1391C_udip_p1.bin: 1746.80-1067.71 m WRF
DSI from FMS/DSI/GPIT/EDTC-B (Pass 2, drill pipe at 1181.5 m WRF)
339-U1391C_mono_p2.bin: 1393.54-1167.77 m WRF
339-U1391C_ldip_p2.bin: m WRF
339-U1391C_udip_p2.bin: 1393.84-1167.07 m WRF
The sonic waveform files are NOT depth-shifted to the seafloor or depth-matched to a reference run . Please refer to the DEPTH SHIFT section in the standard data processing documentation file for further information about depth-shifting and depth-matching..
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 339.