<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742020000200121</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2020.2.1565</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Lahares secundarios en el volcán Popocatépetl: El lahar Nexpayantla del 4 de febrero, 2010]]></article-title>
<article-title xml:lang="en"><![CDATA[Secondary lahars at Popocatépetl volcano: The Nexpayantla lahar of February 4th, 2010]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaragoza]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caballero-García]]></surname>
<given-names><![CDATA[Lizeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Capra]]></surname>
<given-names><![CDATA[Lucia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieto-Torres]]></surname>
<given-names><![CDATA[Amiel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Unidad de Posgrado ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Querétaro Qro.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>37</volume>
<numero>2</numero>
<fpage>121</fpage>
<lpage>134</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742020000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742020000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742020000200121&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los lahares secundarios representan una de las mayores amenazas en volcanes activos o en estado de quietud, por lo tanto, es importante estimar la frecuencia, distribución y los mecanismos disparadores en diferentes volcanes para establecer escenarios de peligro. En este trabajo se analizó el lahar ocurrido el día 4 de febrero del 2010, en la barranca Nexpayantla, ubicada en el sector NW del volcán Popocatépetl. Para ello, se realizó un estudio geomorfológico y textural del depósito, así como de la precipitación y de imágenes de satélite tipo ASTER para delimitar el área de inundación y el mecanismo disparador. Los datos mostraron que este evento se generó por una precipitación de 100 mm/día e inició como una corriente fluvial, que se transformó en un flujo de escombros y finalizó como una corriente diluida. Su transformación, de corriente fluvial a flujo de escombros, se debió a la incorporación de sedimentos por erosión laminar y procesos de remoción en masa que ocurrieron en la barranca, asociados al mismo evento de precipitación. En contraste, su dilución a una corriente fluvial fue por la rápida sedimentación relacionada con cambios en la geometría del cauce, el alto contenido de troncos de árboles y el bajo contenido de material fino. La reproducción del evento mediante simulaciones numéricas permitió calcular que su profundidad pudo alcanzar 1.7 m. Al comparar la distribución del depósito en campo y del lahar en las imágenes de satélite, se observó que el depósito representa sólo el 68 % del área total de inundación del evento. Asimismo, el análisis de la lluvia indicó que una precipitación de igual magnitud a la que disparó el lahar Nexpayantla, tiene un periodo de retorno de 27 años. Finalmente, trabajos enfocados en la caracterización de lahares secundarios en el volcán Popocatépetl permitirán establecer escenarios que incluyan casos como el aquí estudiado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Secondary lahars represent one of the major threats at active or quiescent volcanoes. Therefore, it is important to stablish their frequency, distribution, and triggering mechanism to define hazard-scenarios. In this work, an analysis of a lahar, that occurred on February 4th, 2010 in the Nexpayantla ravine, on northwestern sector of Popocatépetl volcano is presented. A geomorphological and textural analysis coupled with rain data and satellite imagery were used to determine its origin and to delineate inundation areas. This lahar was triggered by a 100 mm/day precipitation and initiated as a stream flow, that transformed into a debris flow, and ended as a stream flow. The transformation from streamflow to debris flow was due to sediment entrainment by laminar erosion and mass wasting processes. In contrast, its subsequent dilution was favored by changes in channel geometry, the high wood content, and the lack of fine sediment. Modelling of this lahar by numerical simulations allowed to calculate a flow depth of up to 1.7 m. Satellite imagery revealed that the deposit observed in the field represents only 68 % of the actual inundation area. Precipitation data indicates a 27-years return period for rains similar in magnitude to the one that triggered this lahar. Further detailed studies of secondary lahars will allow to better constrain hazard-scenarios at Popocatepetl volcano.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lahares secundarios]]></kwd>
<kwd lng="es"><![CDATA[peligro]]></kwd>
<kwd lng="es"><![CDATA[Popocatépetl]]></kwd>
<kwd lng="es"><![CDATA[precipitación]]></kwd>
<kwd lng="es"><![CDATA[erosión]]></kwd>
<kwd lng="es"><![CDATA[procesos de remoción en masa]]></kwd>
<kwd lng="en"><![CDATA[Secondary lahars]]></kwd>
<kwd lng="en"><![CDATA[hazard]]></kwd>
<kwd lng="en"><![CDATA[Popocatépetl]]></kwd>
<kwd lng="en"><![CDATA[rain]]></kwd>
<kwd lng="en"><![CDATA[erosion]]></kwd>
<kwd lng="en"><![CDATA[mass wasting]]></kwd>
</kwd-group>
</article-meta>
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