LeHavreV1, Main, Exploration, bibRecord, 001B47

Crustal structure and seismicity of the Havre Trough at 26°S

Identifieur interne : 001B47 ( Main/Exploration ); précédent : 001B46; suivant : 001B48

Crustal structure and seismicity of the Havre Trough at 26°S

Auteurs : A. Nishizawa [Japon] ; N. Takahashi [Japon] ; S. Abe [Japon]

Source :

Geophysical research letters [ 0094-8276 ] ; 1999.

RBID : Pascal:99-0447432

Descripteurs français

Pascal (Inist)
- Sismicité, Sismographe fond sous marin, Tectonique, Bassin arrière arc, Océan Pacifique Sud Ouest, Hypocentre, Séisme, Bathymétrie, Bassin Lau, Fosse Kermadec, Onde sismique, Onde P, Levé sismique, Sismique réfraction, Tectonique extension, Volcanisme sous marin, Rifting, Expansion fond océanique, Epicentre, Carte bathymétrique, Fosse Havre.
Wicri :
- topic : Séisme.

English descriptors

KwdEn :
- Kermadec Trench, Lau Basin, P-waves, Southwest Pacific, back-arc basins, bathymetric maps, bathymetry, earthquakes, epicenters, extension tectonics, hypocenter, ocean bottom seismographs, rifting, sea-floor spreading, seismic refraction, seismic surveys, seismic waves, seismicity, submarine volcanism, tectonics.

Abstract

An ocean bottom seismographic (OBS) experiment was carried out to investigate the present-day tectonics at the northern end of the Havre Trough, a backarc basin in the southwestern Pacific. Hypocenter distribution shows no seismicity within 50 km of the OBS array but two active regions outside the Trough; one is to the northeast of the array at a bathymetric high between the Lau Basin and Havre Trough; the other is to the southeast of the array beneath the landward slope of the Kermadec Trench. P wavespeed structure obtained from the refraction survey is characterized by a thinned island arc crust with a thickness of 9-10 km. Many volcanic intrusions shown in reflection profiles that support extension tectonics are covered by undisturbed sediments. These suggest little present activity related to rifting and/or spreading.

Affiliations:

Japon
Tokyo

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to stream PascalFrancis, to step Checkpoint: 000384
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to stream Main, to step Curation: 001B47

Le document en format XML

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<front><div type="abstract" xml:lang="en">An ocean bottom seismographic (OBS) experiment was carried out to investigate the present-day tectonics at the northern end of the Havre Trough, a backarc basin in the southwestern Pacific. Hypocenter distribution shows no seismicity within 50 km of the OBS array but two active regions outside the Trough; one is to the northeast of the array at a bathymetric high between the Lau Basin and Havre Trough; the other is to the southeast of the array beneath the landward slope of the Kermadec Trench. P wavespeed structure obtained from the refraction survey is characterized by a thinned island arc crust with a thickness of 9-10 km. Many volcanic intrusions shown in reflection profiles that support extension tectonics are covered by undisturbed sediments. These suggest little present activity related to rifting and/or spreading.</div>
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Crustal structure and seismicity of the Havre Trough at 26°S

Crustal structure and seismicity of the Havre Trough at 26°S

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri