The upper mantle under Western Europe inferred from the dispersion of Rayleigh modes
Item
Title (Dublin Core)
en-US
The upper mantle under Western Europe inferred from the dispersion of Rayleigh modes
Description (Dublin Core)
en-US
A stacking technique is applied to measure phase velocities of the fundamental and several higher Rayleigh modes over an array of long period stations located in Western Europe. The higher mode dispersion has been measured for periods between 25 and 100 s and for phase velocities up to 7.5 km/s. Using Backus-Gilbert inversion, a detailed model for the shear wave velocity in the upper mantle under the array is obtained. The low velocity zone is located between 150 and 230 km depth and is not very pronounced, but it is preceded by a rise in S velocity around 120 km depth. Strong velocity gradients are found at depths of 360 and 520 km. A good fit to the data can only be obtained if a zone of low density is assumed at a depth of 220 km or there about. As yet little can be said about depth, shape and extent of this zone, but the magnitude of the density drop implies a chemical or mineralogical stratification. A mechanism based on eclogite fractionation (Press, 1969) appears to be a likely candidate as the cause for such a gravitationally unstable stratification.
ARK: https://n2t.net/ark:/88439/y010885
Permalink: https://geophysicsjournal.com/article/161
ARK: https://n2t.net/ark:/88439/y010885
Permalink: https://geophysicsjournal.com/article/161
Creator (Dublin Core)
Nolet, G.
Subject (Dublin Core)
en-US
Europe
en-US
Higher modes
en-US
Rayleigh waves
en-US
Upper mantle
en-US
Seismology
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1977-05-20
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/161
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 43 No 1 (1977): Journal of Geophysics; 265-285
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/161/121