<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692017000100103</article-id>
<article-id pub-id-type="doi">10.19155/geofint.2017.056.1.8</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Frecuency-wavenumber analysis of strong ground motion in Mexico City]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baena-Rivera]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Rocha]]></surname>
<given-names><![CDATA[L. Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Sesma]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Ciudad Instituto de Ingeniería ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto de Investigaciones Eléctricas  ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>103</fpage>
<lpage>116</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692017000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692017000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692017000100103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: An analysis of frequency-wavenumber ( &#402; - k ) spectral power densities of strong ground motion recorded by the Mexico City Accelerometric Network (MCAN) is presented. Time series of a seismic event recorded by the MCAN are analysed. Each recorded motion is assumed to be the insight of a homogeneous random field whose spectral representation reveals an assortment of propagating waves. A kinematic decomposition that separates the waves in longitudinal and transversal displacements was made. These motions are associated to Rayleigh and Love waves, respectively. The analysis on different time windows of the MCAN signals to identify back-propagating waves locally generated as a result of their interactions with shallow geological features was applied. For each component, we estimate the &#402; - k spectral power density, which provide the amplitudes, velocities and directions of propagation of the most significant waves. These values, as functions of frequency, constitute the kinematic spectra of the wave field. Results obtained using this method allow to establish coherent scenarios of the wave field in Mexico City Valley that imply pointing out locally generated surface waves.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se presentan los resultados del análisis de las densidades espectrales de potencia en el dominio frecuencia-número de onda ( &#402; - k ) de los movimientos sísmicos registrados por la Red Acelerométrica de la Ciudad de México (MCAN, por sus siglas en inglés). En este tra-bajo se analizaron las series de tiempo de un evento sísmico registrado por la MCAN. Se acepta que cada registro es una realización de un campo aleatorio homogéneo cuya representación espectral revela las diversas ondas que se propagan en el medio. Se hizo una descomposición cinemática que separa las ondas según sus desplazamientos en las direcciones longitudinal y transversal, las cuales se asocian con las componentes horizontales de las ondas de Rayleigh y de Love, respectivamente. El análisis se aplicó a diferentes ventanas de tiempo de las señales para identificar las ondas generadas localmente que se propagan hacia diversas direcciones como resultado de su interacción con la geología superficial. Para cada componente longitudinal y transversal se estimó la densidad espectral de potencia en el dominio &#402; - k, la cual aporta las amplitudes, velocidades y direcciones de propagación de las ondas más significativas. Estos valores en función de la frecuencia constituyen los espectros cinemáticos del campo ondulatorio. Los resultados permiten establecer escenarios coherentes del campo de ondas en el valle de México identificando las ondas superficiales generadas localmente.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Frecuencia-número de onda ( &#402; - k )]]></kwd>
<kwd lng="es"><![CDATA[propagación de ondas]]></kwd>
<kwd lng="es"><![CDATA[ondas superficiales]]></kwd>
<kwd lng="es"><![CDATA[espectros cinemáticos]]></kwd>
<kwd lng="en"><![CDATA[Frequency-wavenumber ( &#402; - k )]]></kwd>
<kwd lng="en"><![CDATA[wave propagation]]></kwd>
<kwd lng="en"><![CDATA[surface waves]]></kwd>
<kwd lng="en"><![CDATA[kinematic spectra]]></kwd>
</kwd-group>
</article-meta>
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