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Coexistence of gravity waves and elastic waves in unconsolidated sediments

R. Esquivel-Sirvent
Coexistence of gravity waves and elastic waves in unconsolidated sediments
Bulletin of the Seismological Society of America (December 2000) 90 (6): 1549-1553

Abstract

Based on a linear viscoelastic model, we study the coexistence and transition of gravity waves and surface elastic waves in a half-space of unconsolidated sediment. The dispersion relation and surface response are calculated as a function of the period and rigidity of the system. The dispersion relation shows two branches. One branch corresponds to a Rayleigh wave for short-wave periods, and it becomes a leaky surface wave as the period increases. The second branch shows a linear dependence of the phase velocity with period as expected for gravity waves. As the period increases, this branch evolves into a leaky surface wave joining the first branch. The surface response function, which is related to the vertical displacement, is also calculated. Two distinct peaks are present in the surface response function. One corresponds to a classical Rayleigh wave, while the second is a gravity-driven mode whose amplitude is strongly dependent on the wave period and soil rigidity.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 90
Serial Issue: 6
Title: Coexistence of gravity waves and elastic waves in unconsolidated sediments
Affiliation: Universidad Nacional Autonoma de Mexico, Instituto de Fisica, Mexico City, Mexico
Pages: 1549-1553
Published: 200012
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 15
Accession Number: 2001-026289
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N19°25'00" - N19°25'00", W99°10'00" - W99°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200109
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