Sonic Waveform Data
IODP logging contractor: USIO/LDEO
Hole: U1389A
Expedition: 339
Location: Gulf of Cadiz (eastern Atlantic Ocean)
Latitude: 36° 25.5183' N
Longitude: 7° 16.6907' W
Logging date: December 24, 2011
Sea floor depth (driller's): 656.2 m DRF
Sea floor depth (logger's): 656 m WRF (HRLA/HLDS/EDTC-B/HNGS Main Run)
Sea floor depth (logger's): 654 m WRF (FMS/DSI/GPIT/EDTC-B Pass 2)
Total penetration: 1011.1 m DRF (354.9 m DSF)
Total core recovered: 335.6 m (94 % of cored section)
Oldest sediment recovered: Pleistocene
Lithology: Nannofossil mud, silty mud and silty sand.
TOOL USED: DSI (Dipole Sonic Imager)
Recording mode: Monopole P&S, Upper Dipole mode (DSI).
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, each recorded every 10 (monopole P&S mode) and 40 microsec (upper dipole mode), 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: 2511 (downlog)
Number of rows: 1522 (pass 1)
Number of rows: 2409 (pass 2)
The following files have been loaded:
DSI from FMS/DSI/GPIT/EDTC-B (Downlog, pipe at ~ 741 m WRF)
339-U1389A_mono_d.bin: 590.3976-972.9215 m WRF
339-U1389A_udip_d.bin: 590.3976-972.9215 m WRF
DSI from FMS/DSI/GPIT/EDTC-B (Pass 1, recorded open hole)
339-U1389A_mono_p1.bin: 1003.8588-772.0584 m WRF
339-U1389A_udip_p1.bin: 1003.8588-772.0584 m WRF
DSI from FMS/DSI/GPIT/EDTC-B (Pass 2, pipe at ~ 740.5 m WRF)
339-U1389A_mono_p2.bin: 1004.7681-637.7889 m WRF
339-U1389A_udip_p2.bin: 1004.7681-637.7889 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.