Borehole Seismic Data


IODP logging contractor: USIO/LDEO

Hole: U1438F

Expedition: 351

Location: Amami-Sankaku Basin (Philippine Sea)

Latitude: 27° 23.0167' N

Longitude: 134° 19.0905' E

Logging date: July 25-26, 2014

Sea floor depth (driller's): 4711 m DRF

Sea floor depth (logger's): 4711 m WRF (MSS/HRLA/HLDS/EDTC-B/HNGS uplog)

Total penetration: 5411 m DRF (700 m DSF)

Total core recovered: none, this hole was dedicated to logging

Lithologies:  Mud with ash, turbidites, conglomerates, breccia, and sandstone were drilled at hole U1438D



TOOL USED: VSI (Versatile Seismic Imager)


The logging data was recorded by Schlumberger in LDF/DLIS format. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 351. The data was then converted into SEGY format at LDEO-BRG, 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 351. 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