Borehole Seismic Data

ODP logging contractor: USIO/LDEO

Hole: U1309D (re-entry hole: previously logged during IODP expeditions 304 and 305)

Expedition: 340T

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

Latitude: 30° 10.120' N

Longitude: 42° 7.113' W

Logging date: February 21-26, 2012

Sea floor depth (driller's): 1656 m DRF

Total penetration (IODP expedition 305):  3071.5 m DRF (1415.5 m DSF)

Total core recovered (this expedition): none

Oldest sediment recovered: none

Lithology: diabase, gabbro, oxide gabbro, dunitic troctolite

TOOL USED: VSI (Versatile Seismic Imager)

The logging data was recorded by Schlumberger in LDF format. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 340T. The data was then converted into SEGY format at USIO/LDEO, using tcode developed in house.

Stacks are generally calculated with at least nine good traces.

All the data in the SEGY files are sorted shot by shot (i.e. chronologically).

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 340T. For further questions about the logs, please contact:

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