Borehole Seismic Data
IODP logging contractor: USIO/LDEO
Expedition: 341
Hole: U1421A
Location: Gulf of Alaska
Latitude: 59° 30.4399' N
Longitude: 143°2.7395' W
Logging date:
Sea floor depth (driller's): 729.7 m DRF
Sea floor depth (logger's): 729 m WRF (DIT/DSI/HLDS/EDTC-B main run)
Total penetration: 702.7 m DSF (1432.4 m DRF)
Core recovery: 20% of cored interval
Oldest sediment recovered: < 0.5 Ma (biostratigraphy)
Lithologies: mud with and without lonestones, diamict, drilled rock, diatom ooze
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 341. The data was then
converted into SEGY format at USIO/LDEO, using code developed in house.
Good shots were obtained at six stations (284.7, 467, 531, 570.9, 637, and 687 m WRF).
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).
A schematic design of the geometry of the VSI tool is in the Documents section of the hole index page.
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 341.
For further questions about the logs, please contact:
Gilles Guerin
phone: 845-365-8671
fax: 845-365-3182
E-mail: Gilles Guerin
Phone: 845-365-8343
Fax: 845-365-3182
E-mail: Cristina Broglia