<?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>S0016-71692005000200169</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Earthquake families in the seismicity of Popocatépetl volcano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espíndola]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamora-Camacho]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2005</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>169</fpage>
<lpage>176</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692005000200169&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692005000200169&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692005000200169&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Analysis of the seismicity of Popocatepétl volcano (Central Mexico) over the period September 1 to December 31, 1995, shows the existence of three earthquake families, with correlation coefficients better than 0.5 in all components of three stations. For two families the events have similar magnitudes and occur over a relatively long period of time. This suggests that they are of the asperity type. They occur up to a depth of 4 km below sea level underneath the volcano, and may be generated by the passage of magma through the upper volcanic conduits.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El análisis de la sismicidad asociada al volcán Popocatépetl (Meseta Central, México) en el periodo 1 de septiembre a 31 de diciembre de 1995 permitió la identificación de 3 familias de temblores. El coeficiente de correlación encontrado para todos los miembros de las familias es mayor de 0.5 en todas las componentes de 3 estaciones cercanas a los epicentros. Los eventos de dos de las familias son de similar magnitud y ocurren dentro de un período relativamente largo. Esto sugiere que sean generados por la acción de una misma aspereza. Los hipocentros de los eventos se localizan bajo el edificio volcánico a profundidades de hasta 4 km bajo el nivel del mar y fueron generados probablemente por el paso de magma a través de los conductos volcánicos superiores.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Volcanes mexicanos]]></kwd>
<kwd lng="es"><![CDATA[sismicidad volcánica]]></kwd>
<kwd lng="es"><![CDATA[familias de temblores]]></kwd>
<kwd lng="es"><![CDATA[volcán Popocatepetl]]></kwd>
<kwd lng="en"><![CDATA[Mexican volcanoes]]></kwd>
<kwd lng="en"><![CDATA[volcano seismicity]]></kwd>
<kwd lng="en"><![CDATA[Popocatépetl volcano]]></kwd>
<kwd lng="en"><![CDATA[earthquake families]]></kwd>
</kwd-group>
</article-meta>
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