Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings
NORSAR recordings of Rayleigh waves generated by presumed nuclear explosions on central and southern Novaya Zemlya and in northwestern Siberia have been studied. Using a frequency time analysing technique and correcting for presumed known dispersion effects across the Baltic Shield, dispersion curve...
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1979
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fthighwire:oai:open-archive.highwire.org:gji:56/1/97 2023-05-15T15:38:30+02:00 Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings Levshin, A. Berteussen, K.-A. 1979-01-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/56/1/97 https://doi.org/10.1111/j.1365-246X.1979.tb04770.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/56/1/97 http://dx.doi.org/10.1111/j.1365-246X.1979.tb04770.x Copyright (C) 1979, Oxford University Press Articles TEXT 1979 fthighwire https://doi.org/10.1111/j.1365-246X.1979.tb04770.x 2013-05-26T23:36:56Z NORSAR recordings of Rayleigh waves generated by presumed nuclear explosions on central and southern Novaya Zemlya and in northwestern Siberia have been studied. Using a frequency time analysing technique and correcting for presumed known dispersion effects across the Baltic Shield, dispersion curves for two different paths across the southern part of the Barents Sea were obtained. The curves are very unusual in that they give extremely low velocities even for periods up to 20 s. For the path to the middle part of the island, the inversion of the data gives a model with sediments and consolidated sediments down to 25 km, followed by a 15-km thick basaltic layer and an upper mantle with a P velocity as low as 7.9 km/s. For the path to the southern part of Novaya Zemlya the data inversion gives a somewhat different model with sediments and consolidated sediments down to 8 km, followed by a 17-km thick zone with velocities close to granitic and a 15-km thick layer with basaltic velocities. Again the upper-mantle P velocity is only 7.9 km/s. Other indications of lateral inhomogeneities in the Barents Sea are obtained by utilizing the array's capability to determine the angle of approach of seismic waves. It is demonstrated that reflections both from inhomogeneities in the Barents Sea and the continental margin off Norway can be detected. For waves from the southern end of the island, a reflection from a strong discontinuity close to the direct path to the middle part of the island is found, whereas signals from this area include a reflected wave possibly coming from the edge of the Svalbard platform. Text Barents Sea Novaya Zemlya Svalbard Siberia HighWire Press (Stanford University) Svalbard Barents Sea Norway Geophysical Journal International 56 1 97 118 |
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HighWire Press (Stanford University) |
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English |
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Articles |
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Articles Levshin, A. Berteussen, K.-A. Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
topic_facet |
Articles |
description |
NORSAR recordings of Rayleigh waves generated by presumed nuclear explosions on central and southern Novaya Zemlya and in northwestern Siberia have been studied. Using a frequency time analysing technique and correcting for presumed known dispersion effects across the Baltic Shield, dispersion curves for two different paths across the southern part of the Barents Sea were obtained. The curves are very unusual in that they give extremely low velocities even for periods up to 20 s. For the path to the middle part of the island, the inversion of the data gives a model with sediments and consolidated sediments down to 25 km, followed by a 15-km thick basaltic layer and an upper mantle with a P velocity as low as 7.9 km/s. For the path to the southern part of Novaya Zemlya the data inversion gives a somewhat different model with sediments and consolidated sediments down to 8 km, followed by a 17-km thick zone with velocities close to granitic and a 15-km thick layer with basaltic velocities. Again the upper-mantle P velocity is only 7.9 km/s. Other indications of lateral inhomogeneities in the Barents Sea are obtained by utilizing the array's capability to determine the angle of approach of seismic waves. It is demonstrated that reflections both from inhomogeneities in the Barents Sea and the continental margin off Norway can be detected. For waves from the southern end of the island, a reflection from a strong discontinuity close to the direct path to the middle part of the island is found, whereas signals from this area include a reflected wave possibly coming from the edge of the Svalbard platform. |
format |
Text |
author |
Levshin, A. Berteussen, K.-A. |
author_facet |
Levshin, A. Berteussen, K.-A. |
author_sort |
Levshin, A. |
title |
Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
title_short |
Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
title_full |
Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
title_fullStr |
Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
title_full_unstemmed |
Anomalous propagation of surface waves in the Barents Sea as inferred from NORSAR recordings |
title_sort |
anomalous propagation of surface waves in the barents sea as inferred from norsar recordings |
publisher |
Oxford University Press |
publishDate |
1979 |
url |
http://gji.oxfordjournals.org/cgi/content/short/56/1/97 https://doi.org/10.1111/j.1365-246X.1979.tb04770.x |
geographic |
Svalbard Barents Sea Norway |
geographic_facet |
Svalbard Barents Sea Norway |
genre |
Barents Sea Novaya Zemlya Svalbard Siberia |
genre_facet |
Barents Sea Novaya Zemlya Svalbard Siberia |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/56/1/97 http://dx.doi.org/10.1111/j.1365-246X.1979.tb04770.x |
op_rights |
Copyright (C) 1979, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1979.tb04770.x |
container_title |
Geophysical Journal International |
container_volume |
56 |
container_issue |
1 |
container_start_page |
97 |
op_container_end_page |
118 |
_version_ |
1766369474420670464 |