Borehole Seismic Data Processing

IODP-USIO logging contractor: LDEO-BRG

Hole: U1327D

Expedition: 311

Location: Cascadia Margin (NE Pacific)

Latitude: 48° 41.8954' N

Longitude: 126° 51.9059' W

Logging date: October 7-8, 2005

Sea floor depth (drillers'): 1314.6 mbrf

Sea floor depth (loggers'): 1314 mbrf

Total penetration: 217.7 mbsf

Total core recovered: 53.99(71.1 % of cored section; only 19.5 m were cored)

Oldest sediment cored: Pleistocene

Lithologies: clay and silty clay

TOOL USED: WST (Well Seismic Tool)

The logging data was recorded by Schlumberger in DLIS format. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 311. 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).

Gilles Guerin

Phone: 845-365-8671

Fax: 845-365-3182

E-mail: Gilles Guerin

Cristina Broglia

Phone: 845-365-8343

Fax: 845-365-3182

E-mail: Cristina Broglia