Borehole Seismic Data



IODP logging contractor: USIO/LDEO

Hole: U1437D

Expedition: 350

Location: Izu-Bonin-Mariana Rear Arc (Philippine Sea)

Latitude: 31° 47.3874' N

Longitude: 139° 01.5723' E

Logging date: April 21-23, 2014

Sea floor depth (driller’s): 2127.3 m DRF

Sea floor depth (logger's): 2126.5 m WRF (MSS/HRLA/APS/HLDS/EDTC-B/HNGS Main Run)

Total penetration (RCB coring):  3107.7 m DRF (980.4 m DSF) .

Total core recovered: 78 m ( 78 % of cored interval). Upper 440 m cored in hole B (55% recovery).

Oldest sediment recovered: 6 Ma, Upper Miocene (from paleomagnetic measurements. All microfossils
recovered are too reworked for proper biostratigraphic identification)

Lithology: Mud with dispersed ash, intercalated intervals of mafic and evolved ash, tuff, tuffaceous mudstone.


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 . 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 350. 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