The velocity of P-waves below the " 20" discontinuity "
Main Article Content
Abstract
Velocity values for P-waves below the " 2 0 ° discontinuit
y " are calculated by applying the Wadati-Masuda method, and by using
separately calculated travel-time curves for the P-waves and the PdPwaves
of each of the five earthquakes examined.
The velocities calculated have a mean value of 10.21 ± 0.24 km/sec,
and are without exception greater than those obtained in a previous piece
of research (9.57 km/sec).
As regards the value of the velocity of the P-waves above the "20°
discontinuity" (8.96 kin/sec), the percentage difference between the velocity
above and the velocity below the "20° discontinuity" is 14%.
Application of the Herglotz-Wiechert procedure in the zone of the
mantle below the "20° discontinuity" does not give significant variations
in the correlation between velocity and depth, in comparison with the results
obtained by other authors.
y " are calculated by applying the Wadati-Masuda method, and by using
separately calculated travel-time curves for the P-waves and the PdPwaves
of each of the five earthquakes examined.
The velocities calculated have a mean value of 10.21 ± 0.24 km/sec,
and are without exception greater than those obtained in a previous piece
of research (9.57 km/sec).
As regards the value of the velocity of the P-waves above the "20°
discontinuity" (8.96 kin/sec), the percentage difference between the velocity
above and the velocity below the "20° discontinuity" is 14%.
Application of the Herglotz-Wiechert procedure in the zone of the
mantle below the "20° discontinuity" does not give significant variations
in the correlation between velocity and depth, in comparison with the results
obtained by other authors.
Article Details
How to Cite
FEDERICO, B. (1975) “quot”;, Annals of Geophysics, 28(1), pp. 45–63. doi: 10.4401/ag-4890.
Issue
Section
OLD
Open-Access License
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.
In most cases, appropriate attribution can be provided by simply citing the original article.
If the item you plan to reuse is not part of a published article (e.g., a featured issue image), then please indicate the originator of the work, and the volume, issue, and date of the journal in which the item appeared. For any reuse or redistribution of a work, you must also make clear the license terms under which the work was published.
This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your own work will ensure your right to make your work freely and openly available. For queries about the license, please contact ann.geophys@ingv.it.