Gutenberg, B. (1959) Wave Velocities below the Mohorovičić Discontinuity. Geophysical Journal of the Royal Astronomical Society, 2 (4). pp. 348-352. ISSN 0016-8009. doi:10.1111/j.1365-246X.1959.tb05805.x. https://resolver.caltech.edu/CaltechAUTHORS:20141118-102527267
|
PDF
- Published Version
See Usage Policy. 324kB |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20141118-102527267
Abstract
The velocities of longitudinal waves immediately below the Mohorovičić discontinuity which have been found by various authors for continental regions decrease on the average from about 8.2 km/s, if the Mohorovičić discontinuity is at a depth of 30 km, to about 8.0 km/s, if it is at a depth of 50 km. The rate of this decrease in velocity of 0.011 ± 0.0016 km/s per km is statistically significant and exceeds appreciably the critical rate of about 0.0013 km/s per km, required for a low-velocity channel. The corresponding calculated average decrease in the velocity of transverse waves from about 4.64 km/s, if the Mohorovičić discontinuity is at a depth of 30 km, to about 4.56 km/s, if it is at 50 km (at a rate of 0.004 ± 0.0056 km/s per km) can be expected to represent average conditions under continents only if this decrease in velocity is considered in connection with that for longitudinal waves. For a depth of about 60 km, both calculated velocity-depth curves connect smoothly with those found by the author from the apparent velocities at the points of inflection of travel-time curves for earthquakes originating at various depths. The new results confirm the hypothesis that under continents the asthenosphere low-velocity channel starts at the Mohorovičić discontinuity.
Item Type: | Article | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Related URLs: |
| |||||||||
Additional Information: | Copyright © 1959 The Royal Astronomical Society. Received August 1959. Contribution No. 939 from the Division of the Geological Sciences, California Institute of Technology. | |||||||||
Other Numbering System: |
| |||||||||
Issue or Number: | 4 | |||||||||
DOI: | 10.1111/j.1365-246X.1959.tb05805.x | |||||||||
Record Number: | CaltechAUTHORS:20141118-102527267 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141118-102527267 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 51899 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | George Porter | |||||||||
Deposited On: | 18 Nov 2014 21:44 | |||||||||
Last Modified: | 10 Nov 2021 19:17 |
Repository Staff Only: item control page