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Local earthquakes of the Mexico Basin in Mexico City; k, Q, source spectra, and stress drop

Javier Lermo, Miguel A. Santoyo, Miguel A. Jaimes, Yanet Antayhua and Marcos Chavacan
Local earthquakes of the Mexico Basin in Mexico City; k, Q, source spectra, and stress drop
Bulletin of the Seismological Society of America (August 2016) 106 (4): 1423-1437

Abstract

We analyzed 14 local earthquakes of the Mexico basin (2.3< or =M (sub w) < or =3.8), recorded on hill sites at local distances (8.0< or =R< or =60.5 km), to study the spectral attenuation of seismic waves, spectral decay parameter kappa kappa , quality factor Q, source spectra, and Brune stress drop. We found an average kappa (sub 0) -value of 0.0457 s in hill sites, which is similar to values reported in other regions. Assuming a 1/R geometrical spreading, we obtain a quality factor given by Q(f)=72f (super 0.83) . Source spectra of all studied events are in good agreement with the omega (super 2) model. From the synthetic modeling of ground motions at local distances, we explain an anomalous behavior of the corner frequency versus seismic moment and also explain the relatively low values observed for stress drop (5 MPa). The resulting high spectral attenuation values obtained may be responsible for the low acceleration values of ground motions observed for crustal earthquakes occurring inside and near to the Mexico basin.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 4
Title: Local earthquakes of the Mexico Basin in Mexico City; k, Q, source spectra, and stress drop
Affiliation: Universidad Nacional Autonoma de Mexico, Instituto de Ingenieria, Coyoacan, Mexico
Pages: 1423-1437
Published: 201608
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 88
Accession Number: 2016-085215
Categories: SeismologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N19°04'60" - N19°40'00", W99°30'00" - W98°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201641
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