TERMIUM Plus®

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ASTHENOSPHERE CHANNEL [1 record]

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Record 1 2002-09-18

English

Subject field(s)
  • Geophysics
PHR

Gutenberg's asthenosphere channel.

French

Domaine(s)
  • Géophysique
DEF

[...] zone de vitesse lente [...] découverte par Gutenberg [...] entre environ 60 et 150 km pour [les ondes]P, 60 et 250 km pour [les ondes]S [dans la croûte terrestre].

OBS

[...] au contact lithosphère-asthénosphère, on note une légère chute des vitesses de propagation des ondes P et S correspondant au passage d'un matériel solide (lithosphère) à un matériel plastique (asthénosphère).

OBS

Dans le manteau supérieur, entre 75 km et 250 km de profondeur, il existe [...] une zone à moindre vitesse [des ondes] d'une centaine de kilomètres d'épaisseur, la LVZ (low velocity zone), où la vitesse est de 7,8 km.s-1; elle correspond à une zone où existe un début de fusion.

Spanish

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