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Channel waves in the earth's crust

Beno Gutenberg
Channel waves in the earth's crust
Geophysics (April 1955) 20 (2): 283-294


Three major low-velocity layers seem to exist in the earth's crust, of which two, the lithosphere channels, are found respectively in the 'granitic' and 'basaltic' ('gabbro') layers of the continents; a third channel extends from the Mohorovicic discontinuity downward into the asthenosphere. Several types of waves are guided by these channels, especially Pa and Sa by the asthenosphere channel, Lg1, Lg2 and Rg by the lithosphere channels; waves guided by low-velocity layers in sediments must also be expected. Many records of the Southern California earthquake of July 21, 1952 show channel waves with periods and velocities as reported for other paths. The regular microseisms with periods of 4 to 10 sec have properties similar to those of the Lg--Rg group in earthquake records and are probably propagated by the same mechanism.Most of these interpretations and conclusions are tentative; pertinent observations are scanty; and complications have thus far prevented development of adequate equations to calculate the amplitudes of waves guided by a given channel.

ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 20
Serial Issue: 2
Title: Channel waves in the earth's crust
Author(s): Gutenberg, Beno
Pages: 283-294
Published: 195504
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
Accession Number: 1959-012408
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N34°47'60" - N35°47'60", W120°15'00" - W117°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 1959
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