Borehole Seismic Data

Science operator: Texas A&M University

Hole: U1609A

Expedition: 401

Location: Mediterranean-Atlantic Gateway

Latitude: 37° 22.6259' N

Longitude: 9° 35.9120' W

Logging date: December 23, 2023

Sea floor depth (driller's): 1670.5 m DRF

Sea floor depth (logger's): 1669.0 m WRF

Oldest sediment recovered: Mid/Late Miocene (Serravallian/Tortonian)

Lithology: calcareous mud, calcareous silty mud, and clayey calcareous ooze

SEISMIC TOOL USED: VSI (Versatile Seismic Imager)

The logging data was recorded by Schlumberger in LDF/DLIS format. 90 shots were acquired at 6 different stations, and provided reliable stacks at 3 stations. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 401. The data was then converted into SEGY format at LDEO/BRG, using code developed in house.

Stacks were generally calculated with at least five 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 International Ocean Discovery Program, Expedition 401.


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