Select your language

P-wawe velocity of the uppermost mantle and crustal thickness in the central Vanuatu islands (New Hebrides island arc)

Coudert E., Cardwell R.K., Isacks B.L., Chatelain Jean-Luc. 1984. Bulletin of the Seismological Society of America.
P-wawe velocity of the uppermost mantle and crustal thickness in the central Vanuatu islands (New Hebrides island arc)
ARTICLE, (1984 ) - PUBLISHEDVERSION - English (en-GB)
Bulletin of the Seismological Society of America
OPENACCESS - .
Audience : RESEARCHERS

Subject
ARC INSULAIRE, PROPAGATION D'ONDE, ONDE SISMIQUE, MANTEAU, CROUTE OCEANIQUE, SUBDUCTION
Domains
Géologie
Description

The P-wave velocity of the uppermost mantle and crustal thickness were determined for the central Vanuatu (formerly Mew Hebrides) Islands using data from a local seismograph network. Two different methods and data sets were lased in this investigation. The first method used travel-time plots for earthquakes located well outside of the seismograph network. The second method used timeterm analysis on sets of earthquakes. Both methods yielded a mantle velocity of 7.6 (90.1) km/sec and a crustal thickness of 27 (92) km for the region located just trenchward of the volcanic arc. Published refraction studies have demonstrated that the mantle velocity near the trench has a more typical value of 8.0 kmlsec. This contrast in mantle velocities between the trench and the volcanic arc has also been reported for the Japanese and Kurile-Kamckatka Island arcs and, therefore, may be a general feature of subduction zones.

Keywords
Language
English (en-GB)
Creators
Coudert E., Cardwell R.K., Isacks B.L., Chatelain Jean-Luc
Contributors
Sources
Bulletin of the Seismological Society of America, 1984, 74 (3), p. 913-924.
Coverage
VANUATU CENTRE
Name of newspaper
Bulletin of the Seismological Society of America