Ray-theoretical modeling of secondary microseism P waves

Secondary microseism sources are pressure fluctuations close to the ocean surface. They generate acoustic P waves that propagate in water down to the ocean bottom where they are partly reflected and partly transmitted into the crust to continue their propagation through the Earth. We present the the...

Descripción completa

Detalles Bibliográficos
Autores: Farra, V., Stutzmann, E., Gualtieri, L., Schimmel, Martin, Ardhuin, F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/139688
Acceso en línea:http://hdl.handle.net/10261/139688
Access Level:acceso abierto
Palabra clave:Body waves
Seismic noise
Wave propagation
Seismic interferometry
id ES_f32ef971f2df91edbbc0ae6f9aa6bea1
oai_identifier_str oai:digital.csic.es:10261/139688
network_acronym_str ES
network_name_str España
repository_id_str
spelling Ray-theoretical modeling of secondary microseism P wavesFarra, V.Stutzmann, E.Gualtieri, L.Schimmel, MartinArdhuin, F.Body wavesSeismic noiseWave propagationSeismic interferometrySecondary microseism sources are pressure fluctuations close to the ocean surface. They generate acoustic P waves that propagate in water down to the ocean bottom where they are partly reflected and partly transmitted into the crust to continue their propagation through the Earth. We present the theory for computing the displacement power spectral density of secondary microseism P waves recorded by receivers in the far field. In the frequency domain, the P-wave displacement can be modeled as the product of (1) the pressure source, (2) the source site effect that accounts for the constructive interference of multiply reflected P waves in the ocean, (3) the propagation from the ocean bottom to the stations and (4) the receiver site effect. Secondary microseism P waves have weak amplitudes, but they can be investigated by beamforming analysis. We validate our approach by analysing the seismic signals generated by typhoon Ioke (2006) and recorded by the Southern California Seismic Network. Backprojecting the beam onto the ocean surface enables to follow the source motion. The observed beam centroid is in the vicinity of the pressure source derived from the ocean wave model WAVEWATCH III. The pressure source is then used for modeling the beam and a good agreement is obtained between measured and modeled beam amplitude variation over time. This modeling approach can be used to invert P-wave noise data and retrieve the source intensity and lateral extent.Thisworkwas supported byAgence Nationale de la Recherche grant ANR-14-CE01-0012 MIMOSA and grant ANR-10-LABX-19-01 ‘LabexMer’. LG acknowledges support from a Lamont–Doherty Earth Observatory Postdoctoral Fellowship and the Brinson Foundation. MS acknowledges MISTERIOS (CGL2013-48601-C2-1-R).Peer ReviewedOxford University PressAgence Nationale de la Recherche (France)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2016201620162016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/139688reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1093/gji/ggw242Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1396882026-05-22T06:33:51Z
dc.title.none.fl_str_mv Ray-theoretical modeling of secondary microseism P waves
title Ray-theoretical modeling of secondary microseism P waves
spellingShingle Ray-theoretical modeling of secondary microseism P waves
Farra, V.
Body waves
Seismic noise
Wave propagation
Seismic interferometry
title_short Ray-theoretical modeling of secondary microseism P waves
title_full Ray-theoretical modeling of secondary microseism P waves
title_fullStr Ray-theoretical modeling of secondary microseism P waves
title_full_unstemmed Ray-theoretical modeling of secondary microseism P waves
title_sort Ray-theoretical modeling of secondary microseism P waves
dc.creator.none.fl_str_mv Farra, V.
Stutzmann, E.
Gualtieri, L.
Schimmel, Martin
Ardhuin, F.
author Farra, V.
author_facet Farra, V.
Stutzmann, E.
Gualtieri, L.
Schimmel, Martin
Ardhuin, F.
author_role author
author2 Stutzmann, E.
Gualtieri, L.
Schimmel, Martin
Ardhuin, F.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Agence Nationale de la Recherche (France)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Body waves
Seismic noise
Wave propagation
Seismic interferometry
topic Body waves
Seismic noise
Wave propagation
Seismic interferometry
description Secondary microseism sources are pressure fluctuations close to the ocean surface. They generate acoustic P waves that propagate in water down to the ocean bottom where they are partly reflected and partly transmitted into the crust to continue their propagation through the Earth. We present the theory for computing the displacement power spectral density of secondary microseism P waves recorded by receivers in the far field. In the frequency domain, the P-wave displacement can be modeled as the product of (1) the pressure source, (2) the source site effect that accounts for the constructive interference of multiply reflected P waves in the ocean, (3) the propagation from the ocean bottom to the stations and (4) the receiver site effect. Secondary microseism P waves have weak amplitudes, but they can be investigated by beamforming analysis. We validate our approach by analysing the seismic signals generated by typhoon Ioke (2006) and recorded by the Southern California Seismic Network. Backprojecting the beam onto the ocean surface enables to follow the source motion. The observed beam centroid is in the vicinity of the pressure source derived from the ocean wave model WAVEWATCH III. The pressure source is then used for modeling the beam and a good agreement is obtained between measured and modeled beam amplitude variation over time. This modeling approach can be used to invert P-wave noise data and retrieve the source intensity and lateral extent.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/139688
url http://hdl.handle.net/10261/139688
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1093/gji/ggw242
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869424352462635008
score 15,81155

Similares en LA Referencia