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Wave Velocities below the Mohorovičić Discontinuity

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.

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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.

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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.
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Caltech Division of Geological Sciences939
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ID Code:51899
Deposited By: George Porter
Deposited On:18 Nov 2014 21:44
Last Modified:10 Nov 2021 19:17

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