Borehole Seismic Data

Science operator: Texas A&M University

Hole: U1503A

Expedition: 368X

Location: South China Sea Rifted Margin (South China Sea)

Latitude: 18° 8.6300' N

Longitude: 116° 18.8456' E

Logging date: December 6, 2018

Sea floor depth (driller's): 3879.1 m DRF

Sea floor depth (logger's): 3879.1 m WRF

Total penetration: 5589.7 m DRF 1710 (m DSF)

Total core recovered: 175.73 m (24.6 % of cored section)

Oldest sediment recovered: n/a/

Lithology: solidified sandstone, siltstone, and claystone, nannofossil-rich; plagioclase phyric basalts 

SEISMIC TOOL USED: VSI (Versatile Seismic Imager)

The logging data was recorded by Schlumberger in LDF/DLIS format. A continuous GR log was recorded with the EDTC-B tool from the bottom of the hole to just above the sea floor, while simultanerously shopopting the required stations. A total of 104 shots were fired in 18 stations. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 368. The data was then converted into SEGY format at 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 International Ocean Discovery Program, Expedition 368X. For further questions about the logs, if the hole is still under moratorium please contact the staff scientist of the expedition.

After the moratorium period you may direct your questions to:

Cristina Broglia

Phone: 845-365-8343

Fax: 845-365-3182

E-mail: Cristina Broglia

Gilles Guerin

phone: 845-365-8671

fax: 845-365-3182

E-mail: Gilles Guerin