Five analyses of seismic velocity employing acoustic tomography were conducted across the location of the sites proposed for Ocean Drilling Program (ODP) drilling on the continental shelf of the Pacific margin of the Antarctic Peninsula. The resulting interval velocities were supplied to the ODP Site Survey Panel before drilling and are now presented in light of the results of ODP Leg 178 drilling, during which three of the five proposed sites were drilled, as a tie between traveltimes and depths at all sites, and as a tool to aid genetic interpretation of seismic units in future studies. We present details of the methodology, the five stack sections across each site, and the picked horizons used for the velocity analysis. The results of the analysis are presented as interval tomographic velocity sections on a depth scale. Finally, we compare tomographic and stacking velocity profiles for each site location. We summarize the main features of the velocity fields obtained in this study in a short concluding section.
1Tinivella, U., Camerlenghi, A., and Rebesco, M., 2001. Data report: Seismic velocity analysis on the continental shelf transect, ODP Leg 178, Antarctic Peninsula. In Barker, P.F., Camerlenghi, A., Acton, G.D., and Ramsay, A.T.S. (Eds.), Proc. ODP, Sci. Results, 178 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/178_SR/chap_16/chap_16.htm>. [Cited YYYY-MM-DD]
2Instituto Nazionale di Oceanografia e di Geofisica Sperimentale-OGS, Borgo Grotta Gigante, 42/c I-34010 Sgonico (Trieste), Italy. Correspondence author: utinivella@ogs.trieste.it
Initial
receipt: 24 January 2001
Acceptance: 1 June 2001
Web publication: 29 August 2001
Ms 178SR-231