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Using overlapping sonobuoy data from the Ross Sea to construct a 2D deep crustal velocity model

Selvans, M. M. and Clayton, R. W. and Stock, J. M. and Granot, R. (2012) Using overlapping sonobuoy data from the Ross Sea to construct a 2D deep crustal velocity model. Marine Geophysical Research, 33 (1). pp. 17-32. ISSN 0025-3235. doi:10.1007/s11001-011-9143-z.

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Sonobuoys provide an alternative to using long streamers while conducting multi-channel seismic (MCS) studies, in order to provide deeper velocity control. We present analysis and modeling techniques for interpreting the sonobuoy data and illustrate the method with ten overlapping sonobuoys collected in the Ross Sea, offshore from Antarctica. We demonstrate the importance of using the MCS data to correct for ocean currents and changes in ship navigation, which is required before using standard methods for obtaining a 1D velocity profile from each sonobuoy. We verify our 1D velocity models using acoustic finite-difference (FD) modeling and by performing depth migration on the data, and demonstrate the usefulness of FD modeling for tying interval velocities to the shallow crust imaged using MCS data. Finally, we show how overlapping sonobuoys along an MCS line can be used to construct a 2D velocity model of the crust. The velocity model reveals a thin crust (5.5 ± 0.4 km) at the boundary between the Adare and Northern Basins, and implies that the crustal structure of the Northern Basin may be more similar to that of the oceanic crust in the Adare Basin than to the stretched continental crust further south in the Ross Sea.

Item Type:Article
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URLURL TypeDescription
Clayton, R. W.0000-0003-3323-3508
Stock, J. M.0000-0003-4816-7865
Additional Information:© 2011 Springer Science+Business Media B.V. Received: 13 June 2011; Accepted: 1 December 2011; Published online: 20 December 2011. We would like to thank Captain Mike Watson, the crew, and the Raytheon Polar Services Corporation technical staff on board the Nathaniel B. Palmer. This study was supported by National Science Foundation grants OPP04-40959 (S. Cande) and OPP-0440923 and OPP-0944711 (J. Stock and R. Clayton).
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Sonobuoy; Multi-channel seismic; Ross Sea; Finite-difference; 2D velocity model; Crustal structure
Issue or Number:1
Record Number:CaltechAUTHORS:20120412-132057738
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30067
Deposited By: Tony Diaz
Deposited On:17 Apr 2012 18:38
Last Modified:09 Nov 2021 19:35

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