The velocity of P-waves below the " 20" discontinuity "
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 veloc...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1975-05-01
|
| Series: | Annals of Geophysics |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4890 |
| Summary: | 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. |
|---|---|
| ISSN: | 1593-5213 2037-416X |