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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 (englisch):
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 DOI: 10.19155/geofint.2017.056.1.1
ISSN: 0016-7169
KITopen ID: 1000063993
Erschienen in Geofísica internacional
Band 56
Heft 1
Seiten 7-12
URLs Link
Schlagworte Rayleigh waves, dispersion, ambiguity, Mexico City valley
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