Borehole Seismic Data Processing (Phase 2)

IODP -USIO logging contractor: LDEO-BRG

Hole: U1309D (Phase 2)

Expedition: 305

Location: Atlantis Massif - Mid Atlantic Ridge (central N Atlantic)

Latitude: 30° 10.120' N

Longitude: 42° 7.113’ W

Logging date: January 31 - February 2, 2005

Sea floor depth (driller’s): 1656 mbrf

Total penetration: 838 mbsf

Total core recovered: 631.5 m (75.36 % of cored section)

Oldest sediment cored: none

Lithologies: diabase, gabbro, oxide gabbro, troctolite

TOOL USED: WST3 (3-Component 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 305 (Phase2). 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