<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222017000300529</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2017v69n3a2</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización granulométrica de los depósitos de abanicos aluviales en la Cuenca de Motozintla, Chiapas, México: un peligro geológico latente por eventos de inundación]]></article-title>
<article-title xml:lang="en"><![CDATA[Granulometric characterization of alluvial fan deposits at the Motozintla Basin, Chiapas, Mexico: a dormant geologic hazard due to flood events]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Núñez]]></surname>
<given-names><![CDATA[Juan M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macías]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saucedo]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Novelo]]></surname>
<given-names><![CDATA[David A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamorano]]></surname>
<given-names><![CDATA[José J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendiola]]></surname>
<given-names><![CDATA[Fabiola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional  ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNAM Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,UASLP Instituto de Geología ]]></institution>
<addr-line><![CDATA[ SLP]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,UNAM Instituto de Geofísica Departamento de Sismología]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,UNAM Instituto de Geografía Departamento de Geografía Física]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>69</volume>
<numero>3</numero>
<fpage>529</fpage>
<lpage>554</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000300529&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000300529&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000300529&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La cuenca de Motozintla se localiza en la región montañosa del sur del estado de Chiapas, México, donde los flujos de escombros han sido eventos frecuentes. Estos fenómenos naturales representan un peligro geológico para los habitantes por ser súbitos, por su alta energía, asociados a pendientes inestables (&gt; 30°), topografía abrupta y factores antropogénicos que hacen más propensa a la población a sufrir los impactos de estos flujos. Esta cuenca se localiza en el extremo occidental de la falla lateral izquierda Polochic, que separa las placas de Norte América y El Caribe. Por su ubicación tectónica, esta cuenca está formada por abanicos aluviales y terrazas colgadas en ambas partes del límite tectónico. Este trabajo se enfoca al estudio de los abanicos aluviales, que están formados por sucesiones de depósitos, algunos separados por paleosuelos poco desarrollados. Se determinaron las características granulométricas totales de 57 depósitos muestreados en 30 columnas estratigráficas. Estas características indican que los abanicos aluviales están compuestos en su mayoría por flujos de escombros (polimíctico y muy pobremente seleccionado) inmaduros, transportados en pendientes abruptas (&gt; 30°) y con distancias de transporte inferiores a 10 km desde la fuente de origen. Estos resultados no se habían presentado en México para este tipo de ambientes tectónicos y de depósito. La recurrencia de estos eventos en el pasado indica que han ocurrido flujos de escombros similares causados por fenómenos hidrometerológicos y sísmicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Motozintla basin is situated in the southern mountainous region of Chiapas State, Mexico, where debris flows have frequently occurred. These natural phenomena are latent geohazards for the population of Motozintla. Their sudden nature, their high energy, related unstable slopes (&gt; 30°), rugged topography and anthropogenic footprint contribute to make them more dangerous. This basin is located in the western end of the left lateral Polochic fault - the structural limit of North America and the Caribbean plates. Tectonically, the basin encompasses alluvial fans and terraces that cut both sides of the plate boundary. This study deals with the alluvial fans that are composed of successive deposits, some separated by underdeveloped paleosoils. Granulometric characteristics of 57 deposits sampled in 30 stratigraphic columns were determined. The results revealed that most alluvial fans were sourced from immature flows (lithological, heterometric and various other sources) transported on steep slopes (&gt; 30°) with less than 10 km of transport from the source. The repeated occurrence of these events in the past indicates that the events of debris flow are influenced by hydrometerological and seismological processes. This research is the first of its kind in an active tectonic setting of Mexico.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Motozintla]]></kwd>
<kwd lng="es"><![CDATA[abanicos aluviales]]></kwd>
<kwd lng="es"><![CDATA[flujos de escombros]]></kwd>
<kwd lng="es"><![CDATA[peligro geológico]]></kwd>
<kwd lng="en"><![CDATA[Motozintla]]></kwd>
<kwd lng="en"><![CDATA[alluvial fans]]></kwd>
<kwd lng="en"><![CDATA[debris flows]]></kwd>
<kwd lng="en"><![CDATA[geohazard]]></kwd>
</kwd-group>
</article-meta>
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