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DOI: 10.19155/geofint.2017.056.1.1

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

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.

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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