Seismoacoustic Studies of the Norwegian Sea
The U.S. Navy hydrophone arrays (SOSUS) record seismoacoustic events in a range of frequencies which includes earthquake and explosive sources as well as those relevant to submarine detection, for which they were designed. In the Norwegian Sea we compare detection of seismoacoustic events on SOSUS w...
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ftdtic:ADP204517 2023-05-15T16:49:39+02:00 Seismoacoustic Studies of the Norwegian Sea Blackman, Donna K. Orcutt, John A. SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA INST OF GEOPHYSICS AND PLANET ARY PHYSICS 1995-08-14 text/html http://www.dtic.mil/docs/citations/ADP204517 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP204517 en eng http://www.dtic.mil/docs/citations/ADP204517 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Government and Political Science Seismology Acoustic Detection and Detectors Nuclear Weapons *SEISMIC WAVES *ARMS CONTROL *NUCLEAR EXPLOSION DETECTION *UNDERWATER ACOUSTICS *ACOUSTIC SURVEILLANCE SYMPOSIA VERIFICATION MONITORING THRESHOLD EFFECTS ACOUSTIC DETECTION SEISMIC DETECTION BEAM FORMING ACOUSTIC ARRAYS HYDROPHONES EARTHQUAKES SUBMARINE DETECTION BEAM STEERING NORWEGIAN SEA OCEAN BASINS TECTONICS ICELAND SOSUS(SOUND SURVEILLANCE SYSTEM) Text 1995 ftdtic 2016-02-19T19:27:25Z The U.S. Navy hydrophone arrays (SOSUS) record seismoacoustic events in a range of frequencies which includes earthquake and explosive sources as well as those relevant to submarine detection, for which they were designed. In the Norwegian Sea we compare detection of seismoacoustic events on SOSUS with seismic detection by the arrays on land in Norway. We also study seismic activity along the spreading centers between Iceland and Svalbard in an attempt to discern any difference in levels of seismicity associated with different sections of the ridge system. Currently, we have assigned archive channels to focus on activity along the Mohns ridge. During March 1995 we recorded many T-phases whose sources have been located along the Mohns ridge using beam steering. Analysis of beamformed data for this continuous one-month period revealed several dozen acoustic events emanating from the southern Mohns ridge and about one third that number from the northern Mohns ridge. Part of this difference is probably due to the choice of beams for the archived data, which emphasizes the southern Mohns ridge, but some of the difference likely reflects the current level of magmatic/tectonic activity. About 10% of the recorded T-phases for this period are preceded by an arrival with greater low frequency content, most likely the P-phase. Approximately two dozen acoustic events were recorded by all channels during the March 95 period suggesting a more distant or larger source, possibly a regional or even teleseismic earthquake. Two of these events correspond to regional events listed in the Center for Monitoring Research (CMR) bulletin, both for which P- and T-phases are observed. This article is from 'Proceedings of the Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty (17th) Held in Scottsdale, Arizona on 12-15 September, 1995', 1996 0607 035, p968-973. Text Iceland Norwegian Sea Svalbard Defense Technical Information Center: DTIC Technical Reports database Norway Norwegian Sea Svalbard |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Government and Political Science Seismology Acoustic Detection and Detectors Nuclear Weapons *SEISMIC WAVES *ARMS CONTROL *NUCLEAR EXPLOSION DETECTION *UNDERWATER ACOUSTICS *ACOUSTIC SURVEILLANCE SYMPOSIA VERIFICATION MONITORING THRESHOLD EFFECTS ACOUSTIC DETECTION SEISMIC DETECTION BEAM FORMING ACOUSTIC ARRAYS HYDROPHONES EARTHQUAKES SUBMARINE DETECTION BEAM STEERING NORWEGIAN SEA OCEAN BASINS TECTONICS ICELAND SOSUS(SOUND SURVEILLANCE SYSTEM) |
spellingShingle |
Government and Political Science Seismology Acoustic Detection and Detectors Nuclear Weapons *SEISMIC WAVES *ARMS CONTROL *NUCLEAR EXPLOSION DETECTION *UNDERWATER ACOUSTICS *ACOUSTIC SURVEILLANCE SYMPOSIA VERIFICATION MONITORING THRESHOLD EFFECTS ACOUSTIC DETECTION SEISMIC DETECTION BEAM FORMING ACOUSTIC ARRAYS HYDROPHONES EARTHQUAKES SUBMARINE DETECTION BEAM STEERING NORWEGIAN SEA OCEAN BASINS TECTONICS ICELAND SOSUS(SOUND SURVEILLANCE SYSTEM) Blackman, Donna K. Orcutt, John A. Seismoacoustic Studies of the Norwegian Sea |
topic_facet |
Government and Political Science Seismology Acoustic Detection and Detectors Nuclear Weapons *SEISMIC WAVES *ARMS CONTROL *NUCLEAR EXPLOSION DETECTION *UNDERWATER ACOUSTICS *ACOUSTIC SURVEILLANCE SYMPOSIA VERIFICATION MONITORING THRESHOLD EFFECTS ACOUSTIC DETECTION SEISMIC DETECTION BEAM FORMING ACOUSTIC ARRAYS HYDROPHONES EARTHQUAKES SUBMARINE DETECTION BEAM STEERING NORWEGIAN SEA OCEAN BASINS TECTONICS ICELAND SOSUS(SOUND SURVEILLANCE SYSTEM) |
description |
The U.S. Navy hydrophone arrays (SOSUS) record seismoacoustic events in a range of frequencies which includes earthquake and explosive sources as well as those relevant to submarine detection, for which they were designed. In the Norwegian Sea we compare detection of seismoacoustic events on SOSUS with seismic detection by the arrays on land in Norway. We also study seismic activity along the spreading centers between Iceland and Svalbard in an attempt to discern any difference in levels of seismicity associated with different sections of the ridge system. Currently, we have assigned archive channels to focus on activity along the Mohns ridge. During March 1995 we recorded many T-phases whose sources have been located along the Mohns ridge using beam steering. Analysis of beamformed data for this continuous one-month period revealed several dozen acoustic events emanating from the southern Mohns ridge and about one third that number from the northern Mohns ridge. Part of this difference is probably due to the choice of beams for the archived data, which emphasizes the southern Mohns ridge, but some of the difference likely reflects the current level of magmatic/tectonic activity. About 10% of the recorded T-phases for this period are preceded by an arrival with greater low frequency content, most likely the P-phase. Approximately two dozen acoustic events were recorded by all channels during the March 95 period suggesting a more distant or larger source, possibly a regional or even teleseismic earthquake. Two of these events correspond to regional events listed in the Center for Monitoring Research (CMR) bulletin, both for which P- and T-phases are observed. This article is from 'Proceedings of the Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty (17th) Held in Scottsdale, Arizona on 12-15 September, 1995', 1996 0607 035, p968-973. |
author2 |
SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA INST OF GEOPHYSICS AND PLANET ARY PHYSICS |
format |
Text |
author |
Blackman, Donna K. Orcutt, John A. |
author_facet |
Blackman, Donna K. Orcutt, John A. |
author_sort |
Blackman, Donna K. |
title |
Seismoacoustic Studies of the Norwegian Sea |
title_short |
Seismoacoustic Studies of the Norwegian Sea |
title_full |
Seismoacoustic Studies of the Norwegian Sea |
title_fullStr |
Seismoacoustic Studies of the Norwegian Sea |
title_full_unstemmed |
Seismoacoustic Studies of the Norwegian Sea |
title_sort |
seismoacoustic studies of the norwegian sea |
publishDate |
1995 |
url |
http://www.dtic.mil/docs/citations/ADP204517 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP204517 |
geographic |
Norway Norwegian Sea Svalbard |
geographic_facet |
Norway Norwegian Sea Svalbard |
genre |
Iceland Norwegian Sea Svalbard |
genre_facet |
Iceland Norwegian Sea Svalbard |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP204517 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766039786964910080 |