Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Polish Polar Research

The Journal of Committee on Polar Research of Polish Academy of Sciences

4 Issues per year


IMPACT FACTOR 2016: 0.636
5-year IMPACT FACTOR: 1.121

CiteScore 2016: 1.20

SCImago Journal Rank (SJR) 2015: 0.556
Source Normalized Impact per Paper (SNIP) 2015: 0.645

Open Access
Online
ISSN
2081-8262
See all formats and pricing
More options …
Volume 32, Issue 4 (Jan 2011)

Modelling of seafloor multiples observed in OBS data from the North Atlantic - new seismic tool for oceanography?

Marek Grad
  • Instytut Geofizyki, Wydział Fizyki, Uniwersytet Warszawski, ul. Pasteura 7, 02-093 Warszawa, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Rolf Mjelde / Wojciech Czuba / Aleksander Guterch / Johannes Schweitzer / IPY Project Group
Published Online: 2011-12-17 | DOI: https://doi.org/10.2478/v10183-011-0027-3

Modelling of seafloor multiples observed in OBS data from the North Atlantic - new seismic tool for oceanography?

In marine seismic wide-angle profiling the recorded wave field is dominated by waves propagating in the water. These strong direct and multiple water waves are generally treated as noise, and considerable processing efforts are employed in order minimize their influences. In this paper we demonstrate how the water arrivals can be used to determine the water velocity beneath the seismic wide-angle profile acquired in the Northern Atlantic. The pattern of water multiples generated by air-guns and recorded by Ocean Bottom Seismometers (OBS) changes with ocean depth and allows determination of 2D model of velocity. Along the profile, the water velocity is found to change from about 1450 to approximately 1490 m/s. In the uppermost 400 m the velocities are in the range of 1455-1475 m/s, corresponding to the oceanic thermocline. In the deep ocean there is a velocity decrease with depth, and a minimum velocity of about 1450 m/s is reached at about 1.5 km depth. Below that, the velocity increases to about 1495 m/s at approximately 2.5 km depth. Our model compares well with estimates from CTD (Conductivity, Temperature, Depth) data collected nearby, suggesting that the modelling of water multiples from OBS data might become an important oceanographic tool.

Keywords: Arctic; Atlantic Ocean; controlled source seismology; ocean bottom seismometers; wave propagation; seafloor multiples

  • Červený V. and Pšenčík I. 1983. 2-D seismic ray tracing package SEIS83 (software package). Charles University, Prague.Google Scholar

  • Clay C.S. and Medwin H. 1997. Acoustical oceanography: pronciples and applications. Wiley-Inc., New York: 544 pp.Google Scholar

  • Czuba W., Grad M., Mjelde R., Guterch A., Libak A., Krüger F., Murai Y., Schweitzer J. and the IPY Project Group 2011. Continent-ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea. Geophysical Journal International 184: 541-554.Web of ScienceGoogle Scholar

  • Faleide J.I., Tsikalas F., Breivik A.J., Mjelde R., Ritzmann O., Engen Ø., Wilson J. and Eldholm O. 2008. Structure and evolution of the continental margin off Norway and the Barents Sea. Episodes 31 (1): 82-91.Google Scholar

  • Gabrielsen R.H., Færseth R.B., Jensen L.N., Kalheim J.E. and Riis F. 1990. Structural elements of the Norwegian continental shelf, Part I: the Barents Sea Region. NPD-Bulletin 6: 1-33. Oljedirektoratet.Google Scholar

  • Grad M., Mjelde R., Czuba W., Guterch A. and the IPY Project Group 2012 (in press). Elastic properties of seafloor sediments from the modelling of amplitudes of multiple water waves recorded on the seafloor off Bear Island, North Atlantic. Geophysical Prospecting.Web of ScienceGoogle Scholar

  • Holbrook W.S., Fer I. and Schmitt R.W. 2009. Images of internal tides near the Norwegian continental slope. Geophysical Research Letters 36. L00D10.Web of ScienceGoogle Scholar

  • Jakobsson M., Cherkis N.Z., Woodward J., Macnab R. and Coakley B. 2000. New grid of Arctic bathymetry aids scientists and mapmakers. EOS, Transactions AGU 81 (9): 89, 93, 96.Google Scholar

  • Leroy C.C., Robinson S.P. and Goldsmith M.J. 2008. A new equation for the accurate calculation of sound speed in all oceans. Journal of the Acoustical Society of America 124 (5): 2774-2782.Web of ScienceGoogle Scholar

  • Mjelde R., Breivik A.J., Raum T., Mittelstaedt E., Ito G. and Faleide J.I. 2008. Magmatic and tectonic evolution of the North Atlantic. Journal of the Geological Society London 165: 31-42.Web of ScienceGoogle Scholar

  • Piechura J. and Walczowski W. 2009. Warming of the West Spitsbergen Current and sea ice in north of Svalbard. Oceanologia 51 (2): 147-164.CrossrefWeb of ScienceGoogle Scholar

  • Schweitzer J. and The IPY Project Consortium Members 2008a. The International Polar Year 2007-2008 Project "The Dynamic Continental Margin between the Mid-Atlantic-Ridge System (Mohn's Ridge, Knipovich Ridge) and the Bear Island Region". NORSAR Scientific Report 1-2008: 53-63.Google Scholar

  • Schweitzer J., Guterch A., Krüger F., Schmidt-Aursch M., Mjelde R., Grad M. and Faleide J. 2008b. The IPY Project 77 - The dynamic continental margin between the Mid-Atlantic-Ridge system (Mohns Ridge, Knipovich Ridge) and the Bear Island Region. In: 33 International Geological Congress, Oslo, 6-14 August 2008, CD-ROM Proceedings.Google Scholar

  • Walczowski W. 2009. Atlantic Water in the Nordic Seas - properties, variability, climatic significance. Rozprawy i monografie IO PAN, Sopot: 244 pp.Google Scholar

  • Walczowski W., Piechura J., Osinski R. and Wieczorek P. 2005. The West Spitsbergen Current volume and heat transport from synoptic observations in summer. Deep-Sea Research I 52: 1374-1391.Google Scholar

About the article


Published Online: 2011-12-17

Published in Print: 2011-01-01


Citation Information: Polish Polar Research, ISSN (Online) 2081-8262, ISSN (Print) 0138-0338, DOI: https://doi.org/10.2478/v10183-011-0027-3.

Export Citation

This content is open access.

Citing Articles

Here you can find all Crossref-listed publications in which this article is cited. If you would like to receive automatic email messages as soon as this article is cited in other publications, simply activate the “Citation Alert” on the top of this page.

[1]
Robert A. Dunn
The Journal of the Acoustical Society of America, 2015, Volume 138, Number 6, Page 3458
[2]
Marek Grad, Rolf Mjelde, Lech Krysiński, Wojciech Czuba, Audun Libak, and Aleksander Guterch
Polar Science, 2015, Volume 9, Number 1, Page 168
[3]
Marek Grad, Rolf Mjelde, Wojciech Czuba, and Aleksander Guterch
Geophysical Prospecting, 2012, Volume 60, Number 5, Page 855

Comments (0)

Please log in or register to comment.
Log in