<?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>S1026-87742005000200159</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Distribution and stratigraphy of deposits produced by diluted pyroclastic density currents of the 1982 eruption of El Chichón volcano, Chiapas, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Distribución y estratigrafía de depósitos producidos por oleadas piroclásticas durante la erupcion de 1982 del volcán El Chichón, Chiapas, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Scolamacchia]]></surname>
<given-names><![CDATA[Teresa]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónona de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>159</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742005000200159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742005000200159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742005000200159&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The March 29 to April 4, 1982 eruption of El Chichón volcano in southeastern Mexico was characterized by a complex interplay between magmatic and phreatomagmatic eruptive events, that were responsible for the generation of plinian columns and concentrated and diluted density currents. Revision of the stratigraphy indicates that the interaction between magma and hydrothermal acid water played an important role during the last phases of the eruption. Diluted density currents were widely dispersed, mainly to the eastern side of the volcano due to the particular topographic conditions in this area. The overall distribution of pyroclastic surge deposits refl ects the dispersal of fallout deposits determined by the direction of tropospheric (ENE) winds at the time of the eruption. This observation suggests that near-ground winds were strong and blowing in the same direction as high altitude (&lt;18 km) winds, thus enhancing the dispersion of the vanishing portions of the pyroclastic density currents.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La erupción del volcán El Chichón en el sureste de México, ocurrida del 29 de Marzo al 4 de Abril de 1982, se caracterizó por una alternancia compleja entre eventos magmáticos y freatomagmáticos que generaron columnas plinianas, flujos y oleadas piroclásticas. La estratigrafía de los depósitos indica que la interacción entre magma y agua hidrotermal jugó un papel importante durante las últimas fases de la erupción. Las oleadas piroclásticas fueron ampliamente distribuidas hacia el oriente del volcán debido a las condiciones topográfi cas presentes en esta dirección. La distribución general de los depósitos de oleada piroclástica refl eja la distribución de los depósitos de caída, la cual fue determinada por la dirección de los vientos troposféricos (ENE) durante la erupción. Esto sugiere que los vientos cercanos al terreno eran fuertes y soplaban en la misma dirección que los vientos superiores (&lt; 18 km), influenciando la distribución de las porciones más diluidas de las oleadas piroclásticas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[pyroclastic density currents]]></kwd>
<kwd lng="en"><![CDATA[1982 eruption]]></kwd>
<kwd lng="en"><![CDATA[El Chichón]]></kwd>
<kwd lng="en"><![CDATA[Chiapas]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[oleada piroclástica]]></kwd>
<kwd lng="es"><![CDATA[erupción de 1982]]></kwd>
<kwd lng="es"><![CDATA[El Chichón]]></kwd>
<kwd lng="es"><![CDATA[Chiapas]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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