<?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>0256-7024</journal-id>
<journal-title><![CDATA[Revista Geológica de América Central]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Geol. Amér. Central]]></abbrev-journal-title>
<issn>0256-7024</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0256-70242018000100055</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v58i0.32844</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El deslizamiento del 8 de diciembre de 1994 en el Volcán Irazú (Costa Rica): aspectos históricos y geomorfología con base en fotografías aéreas históricas y recientes]]></article-title>
<article-title xml:lang="en"><![CDATA[The december 8 th 1994 landslide at Irazú Volcano (Costa Rica): historical aspects and geomorphology based on historical and recent aerial photographs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fallas]]></surname>
<given-names><![CDATA[Mauro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prado]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[Mauricio M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[Paulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A4"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfaro]]></surname>
<given-names><![CDATA[Eric J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto]]></surname>
<given-names><![CDATA[Gerardo J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica  Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Geospatial Innovations  ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica  Red Sismológica Nacional]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica  Laboratorio Nacional de Materiales y Modelos Estructurales]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Física y Centro de Investigación en Ciencias del Mar y Limnología Centro de Investigaciones Geofísicas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<numero>58</numero>
<fpage>55</fpage>
<lpage>84</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242018000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242018000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242018000100055&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El 8 de diciembre de 1994, a las 22:48 (hora local), tuvo lugar en el flanco norte del volcán Irazú un evento particular, que se describió en esa época como una erupción freática. Recientemente, se cuestionó la naturaleza volcánica de este evento y se propuso que habría sido una avalancha de escombros generado por un deslizamiento. En este trabajo se retomó el análisis de este proceso desde la perspectiva histórica, geológica y geomorfológica, y se reforzó dicha hipótesis a la luz de evidencias sismológicas, aunque sigue sin descartarse que hubiera intervenido actividad geotermal. En este trabajo se realizó la restitución fotogramétrica a partir de fotografías aéreas obtenidas por el Instituto Geográfico Nacional (IGN) el 20 de diciembre de 1994, mediante la cual se estimó un volumen deslizado entre 21±8 y 22±7x106 m3.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract On December 8th, 1994, at 22:48 (local time), a particular event took place on the northern flank of the Irazú volcano, which was described at that time as a phreatic eruption. Recently, the volcanic nature of this event was questioned and it was proposed that it would have been a debris avalanche generated by a landslide. In this work we studied this process from the historical, geological and geomorphological perspective. The hypothesis of the landslide is reinforced based on seismological evidences, although it is still not ruled out that geothermal activity could have been involved. In this work, the photogrammetric restitution was made from aerial photographs obtained by the National Geographic Institute (IGN) on December 20th, 1994, by which a volume of sliding material between 21±8 and 22±7x106 m3 was estimated.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Phreatic explosion]]></kwd>
<kwd lng="en"><![CDATA[debris avalanche]]></kwd>
<kwd lng="en"><![CDATA[photogrammetry]]></kwd>
<kwd lng="en"><![CDATA[Irazú]]></kwd>
<kwd lng="en"><![CDATA[landslide]]></kwd>
<kwd lng="en"><![CDATA[Costa Rica]]></kwd>
<kwd lng="es"><![CDATA[Explosión freática]]></kwd>
<kwd lng="es"><![CDATA[avalancha de escombros volcánicos]]></kwd>
<kwd lng="es"><![CDATA[fotogrametría]]></kwd>
<kwd lng="es"><![CDATA[Irazú]]></kwd>
<kwd lng="es"><![CDATA[deslizamientos]]></kwd>
<kwd lng="es"><![CDATA[Costa Rica]]></kwd>
</kwd-group>
</article-meta>
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