Characterizing the oceanic ambient noise as recorded by the dense seismo-acoustic Kazakh network
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Published:2021-02-25
Issue:2
Volume:12
Page:503-520
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ISSN:1869-9529
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Container-title:Solid Earth
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language:en
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Short-container-title:Solid Earth
Author:
Smirnov Alexandr, De Carlo MarineORCID, Le Pichon Alexis, Shapiro Nikolai M., Kulichkov Sergey
Abstract
Abstract. In this study, the dense seismo-acoustic network of the Institute
of Geophysical Research (IGR), National Nuclear Centre of the Republic of
Kazakhstan, is used to characterize the global ocean ambient noise. As the
monitoring facilities are collocated, this allows for a joint
seismo-acoustic analysis of oceanic ambient noise. Infrasonic and seismic
data are processed using a correlation-based method to characterize the
temporal variability of microbarom and microseism signals from 2014 to 2017.
The measurements are compared with microbarom and microseism source model
output that are distributed by the French Research Institute for
Exploitation of the Sea (IFREMER). The microbarom attenuation is calculated
using a semi-empirical propagation law in a range-independent atmosphere. The
attenuation of microseisms is calculated taking into account seismic
attenuation and bathymetry effect. Comparisons between the observed and
predicted infrasonic and seismic signals confirm a common source mechanism
for both microbaroms and microseisms. Multi-year and intra-seasonal
parameter variations are analyzed, revealing the strong influence of
long-range atmospheric propagation on microbarom predictions. In winter,
dominating sources of microbaroms are located in the North Atlantic and in
the North Pacific during sudden stratospheric warming events, while signals
observed in summer could originate from sources located in the Southern
Hemisphere; however, additional analyses are required to consolidate this
hypothesis. These results reveal the strengths and weaknesses of seismic and
acoustic methods and lead to the conclusion that a fusion of two techniques
brought the investigation to a new level of findings. Summarized findings
also provide a perspective for a better description of the source (localization,
intensity, spectral distribution) and bonding mechanisms of the
ocean–atmosphere–land interfaces.
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Earth-Surface Processes,Geochemistry and Petrology,Geology,Geophysics,Soil Science
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