Abstract: Journal of Geophysical Research (1896-1977)Volume 80, Issue 11 p. 1444-1448 Melt squirt in the asthenosphere Gerald Mavko, Gerald MavkoSearch for more papers by this authorAmos Nur, Amos NurSearch for more papers by this author Gerald Mavko, Gerald MavkoSearch for more papers by this authorAmos Nur, Amos NurSearch for more papers by this author First published: 10 April 1975 https://doi.org/10.1029/JB080i011p01444Citations: 322AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The interpretation of the seismic low-velocity zone as a region of partially molten rock is extended to explain the transient displacements following the 1946 Nankaido earthquake. Three partial melt models are considered to account for the observed time constant of 3–5 years: large-scale diffusion of melt through a porous matrix can decay over thousands to billions of years and is much too slow. Simple shearing in 'penny-shaped' cracks happens on a seismic time scale and is much too rapid. Interconnected penny-shaped cracks at different orientations with respect to the principal stresses respond on an intermediate time scale by short-range melt squirt from one crack to another, providing a reasonable mechanism to account for the transient deformation at Nankaido, while components of shear parallel to each individual crack relax quickly according to the better-known mechanism for seismic attenuation in the low-velocity zone. References Aki, K., Seismological evidences for the existence of soft thin layers in the upper mantle under Japan, J. Geophys. Res., 732, 585– 594, 1968. Anderson, D. L., C. Sammis, Partial melting in the upper mantle, Phys. Earth Planet. Interiors, 3, 41– 50, 1970. , Handbook of Physical Constants S. P. Clark, Geological Society of America, New York, 1966. Gordon, R. B., Diffusion creep in the earth's mantle, J. Geophys. Res., 7010, 2413– 2418, 1965. Kanamori, H., Mantle beneath the Japanese arc, Phys. Earth Planet. Interiors, 3, 475– 483, 1970. Kanamori, H., Great earthquakes at island arcs and the lithosphere, Tectonophysics, 12, 187– 198, 1971. Kanamori, H., Mode of strain release associated with major earthquakes in Japan, Annual Review of Earth and Planetary Sciences, 1 F. A. Donath, F. G. Stehli, G. W. Wetherill, Annual Reviews, Palo Alto, Calif., 1973. Matuzawa, T., Study of Earthquakes, Uno Shoten, Tokyo, Japan, 1964. Nur, A., Viscous phase in rocks and the low-velocity zone, J. Geophys. Res., 755, 1270– 1277, 1971. Nur, A., J. Booker, Aftershocks caused by pore fluid flow?, Science, 175, 885– 887, 1972. Nur, A., G. Mavko, Postseismic viscoelastic rebound, Science, 1834121, 204– 206, 1974. Solomon, S. C., Seismic wave attenuation and partial melting in the upper mantle of North America, J. Geophys. Res., 778, 1483– 1502, 1972. Thatcher, W., Strain release mechanism of the 1906 San Francisco earthquake, Science, 184, 4143, 1974. Walsh, J. B., A new analysis of attenuation in partially melted rock, J. Geophys. Res., 74, 4333, 1969. Weertman, J., The creep Strength of the earth's mantle, Rev. Geophys. Space Phys., 81, 145, 1970. Citing Literature Volume80, Issue11Solid Earth and Planets10 April 1975Pages 1444-1448 ReferencesRelatedInformation
Publication Year: 1975
Publication Date: 1975-04-10
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 429
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