High-quality sonic log waveforms were recorded during Leg 190 from 65- to 360 m below seafloor (mbsf) in Hole 1173A. Schlumberger's wireline Dipole Shear Imager (DSI) tool was used, and the data were reprocessed using a phase-picking method to improve the shipboard P- and S-wave logs. This postcruise work focused on evaluating the high variability observed in the P-wave log in the upper interval of the hole and an inversion (low VP and VS) below 350 mbsf. In these intervals, sonic signals were weak and difficult to identify using standard shipboard processing methods. The outcome of the reprocessing was successful and extracted improved P-wave logs and S-wave values as low as 280 m/s in the upper interval of the hole and below 350 mbsf. The reprocessed data are currently available online at www.ldeo.columbia.edu/BRG/ODP/DATABASE/index.html.
1Goldberg, D., 2003. Data report: Reprocessing of wireline sonic logs in turbidites and hemipelagic sediments at ODP Site 1173. In Mikada, H., Moore, G.F., Taira, A., Becker, K., Moore, J.C., and Klaus, A. (Eds.), Proc. ODP, Sci. Results, 190/196 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/190196SR/209/209.htm>. [Cited YYYY-MM-DD]
2Lamont-Doherty Earth Observatory, Borehole Research Group, PO Box 1000, 61 Route 9W, Palisades NY 10964, USA. goldberg@ldeo.columbia.edu
Initial receipt: 17 November 2002
Acceptance: 15 May 2003
Web publication:
25 July 2003
Ms 190SR-209