Borehole Seismic Data

 

IODP logging contractor: USIO/LDEO

Hole: U1399C

Expedition: 340

Location: Lesser Antilles, off Martinique (Caribbean Sea)

Latitude: 14° 23.2593' N

Longitude: 61° 42.6665' W

Logging date: April 2, 2012

Sea floor depth (driller's): 2912.4 m DRF

Sea floor depth (logger's): 2910 m WRF (HRLA/HLDS/MSS/EDTC-B main)

Total penetration:  240 m DsF (3160 m DRF)

Total core recovered: 0 m (logging-dedicated hole)

Oldest sediment recovered: < 410 ka (?)

Lithologies: Alternating layers of hemipelagic mud, volcaniclastic fine sand and tephra

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 code 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 340.

For any question about the data or about the LogDB database, please contact LogDB support: logdb@ldeo.columbia.edu.