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Unusual, equivocal Rayleigh-dispersion curves for simple models taking into account the special propagation conditions in the valley of Mexico City (CDMX) : Preliminary results

Malischewsky, Peter G.; Forbriger, Thomas; Lomnitz, Cinna

Abstract:
Other than commonly assumed in seismology, the phase velocity of Rayleigh waves not necessarily is a single-valued function of frequency. We demonstrate this for the first higher mode in simple models of a homogeneous layer on top of a homogeneous halfspace (LOH), which are used for the subsurface of the Texcoco zone in Mexico ity valley in previous studies. In the structure of a homegenous layer with fixed bottom (LFB) the phenomenon exists for alues of Poisson’s ratio between 0.19 and 0.5 and is most pronounced for P-velocity being three times S-velocity (Poisson’s ratio of 0.4375). This type of dispersion is demonstrated and a discussion of their possible fatal consequences for methods customarily used in seismology for dispersion analysis and synthesis of dispersion relations is presented.

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Originalveröffentlichung
DOI: 10.19155/geofint.2017.056.1.1
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 0016-7169
KITopen-ID: 1000063993
Erschienen in Geofísica internacional
Band 56
Heft 1
Seiten 7-12
Externe Relationen Siehe auch
Schlagworte Rayleigh waves, dispersion, ambiguity, Mexico City valley
Nachgewiesen in Web of Science
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