Borehole Seismic Data
ODP logging contractor: LDEO-BRG
Hole: 1251H
Leg: 204
Location: Hydrate Ridge - Cascadia Margin (NE Pacific)
Latitude: 44° 34.2089' N
Longitude: 125° 4.4514' W
Logging date: August 17-18, 2002
Water depth (as seen on logs): 1219.5 mbrf
Total penetration: 445 mbsf
Total core recovered: no cores taken in this hole
TOOL USED: WST3 (3-Component Well Seismic Tool.
The logging data was recorded by Schlumberger in DLIS format. Zero-offset VSP stations were taken with the WST-3 at 7.5 m intervals, about half of which yielded reasonable quality results. Walk-away VSP surveys along E-W and N-S lines were made with a station at 100 mbsf.
All processing, including first arrival picking and stacking, was performed by Schlumberger during Leg 204. The data was then converted into SEGY format at the Borehole Research Group of the Lamont-Doherty Earth Observatory, using the SEGY Save module in GeoFrame.
Stacks are generally calculated with at least seven good traces.
All the data in the SEGY files are sorted shot by shot (i.e. chronologically).