The character of seafloor ambient noise recorded offshore New Zealand : results from the MOANA ocean bottom seismic experiment


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dc.contributor.author Yang, Zhaohui
dc.contributor.author Sheehan, Anne F.
dc.contributor.author Collins, John A.
dc.contributor.author Laske, Gabi
dc.date.accessioned 2012-11-28T20:26:28Z
dc.date.available 2013-04-16T08:46:22Z
dc.date.issued 2012-10-16
dc.identifier.citation Geochemistry Geophysics Geosystems 13 (2012): Q10011 en_US
dc.identifier.uri http://hdl.handle.net/1912/5589
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 13 (2012): Q10011, doi:10.1029/2012GC004201. en_US
dc.description.abstract We analyze the characteristics of ambient noise recorded on ocean-bottom seismographs using data from the 2009–2010 MOANA (Marine Observations of Anisotropy Near Aotearoa) seismic experiment deployed west and east of South Island, New Zealand. Microseism and infragravity noise peaks are clear on data recorded on the vertical channel of the seismometer and on the pressure sensor. The noise levels in the infragravity band (<0.03 Hz) on the horizontal seismometer channels are too high to show the infragravity peak. There is a small difference (~0.25 Hz versus ~0.2 Hz) in microseism peak frequencies between the two sides of the South Island on all three seismic channels. Our results show clear depth dependence between the peak frequency of infragravity waves and the water depth. We find that the product of water depth and wave number at the peak frequency is a constant, koH = 1.5. This relationship can be used to determine the variation of phase and group velocity of infragravity waves with water depth, and the location of the infragravity peak and corresponding noise notch at any water depth. These estimates of spectral characteristics, particularly low noise bands, are useful for future OBS deployments. en_US
dc.description.sponsorship The collection of OBS data was supported by the National Science Foundation Continental Dynamics program under grants EAR-0409564, EAR-0409609, and EAR-0409835. en_US
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2012GC004201
dc.subject New Zealand en_US
dc.subject OBS en_US
dc.subject Continental shelf en_US
dc.subject Infragravity wave en_US
dc.subject Noise en_US
dc.title The character of seafloor ambient noise recorded offshore New Zealand : results from the MOANA ocean bottom seismic experiment en_US
dc.type Article en_US
dc.description.embargo 2013-04-16 en_US
dc.identifier.doi 10.1029/2012GC004201

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