<?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>S0256-70242020000100074</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v62i0.40640</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis de la dinámica y productos balísticos durante la erupción del Poás (Costa Rica) en el 2017]]></article-title>
<article-title xml:lang="en"><![CDATA[Analysis of the dynamic and the ballistic products of the 2017 eruption of Poas Volcano (Costa Rica)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brenes-André]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado]]></surname>
<given-names><![CDATA[Guillermo E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavarría]]></surname>
<given-names><![CDATA[Nathalie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Blas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avard]]></surname>
<given-names><![CDATA[Geoffroy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrantes]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quesada]]></surname>
<given-names><![CDATA[Catalina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Red Ciudadana de Estaciones Meteorológicas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Comisión Nacional de Prevención de Riesgos y Atención de Emergencias (CNE) Unidad de Investigación y Análisis del Riesgo ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Costarricense de Electricidad Área de Amenazas y Auscultación Sismológica y Volcánica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Observatorio Sismológico y Vulcanológico de Costa Rica (OVSICORI) ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Costarricense de Electricidad (ICE)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Sistema Nacional de Áreas de Conservación (SINAC) Parque Nacional Volcán Poás ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<numero>62</numero>
<fpage>74</fpage>
<lpage>101</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242020000100074&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242020000100074&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242020000100074&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Entre el 12 y 22 de abril del 2017 el volcán Poás experimentó una nueva fase explosiva con lances de fragmentos balísticos hasta ~2,2 km. En su fase inicial predominaban los bloques no juveniles, producto de la destrucción del cuerpo lávico formado en 1953 y del piso lacustre, seguido por un incremento en fragmentos juveniles (bloques vidriosos con corteza de pan, tortas escoriáceas y, raramente, bombas fusiformes). Las bombas más grandes alcanzaron un diámetro de 20 m por ~1,5 m de grosor lanzadas a unos 200 m del cráter. Los juveniles poseen vesiculación variada (15-50 % vesículas) de composición andesítico basáltica (fenocristales plag 20-22 %, cpx 6-8%, opx 3-5 %, ol 1-3 %, mt 0-1 %) con matriz intersectal. El contenido de juveniles en las cenizas freatomagmáticas incrementó desde aproximadamente un 9 % hasta un 85 % al final, representado por una fase estromboliana. Las bombas al impactar generaron diaclasas de enfriamiento perpendiculares a la superficie y en par conjugado de cizalla. Durante su fase de enfriamiento, las diaclasas se formaron paralelas a la superficie impactada, así establecieron un patrón rectangular relativamente simétrico y conjugado, pero cuando existió una pendiente, el diaclasamiento fue más complejo al deformarse por reptar en estado viscoso. La velocidad inicial de salida de los balísticos se estimó en 100-300 ms-1 (~360-1000 km/h), con una velocidad de llegada de 36-120 ms-1 (~130-430 km/h) y una terminal de 124-250 ms-1 (~445-900 km/h). El tiempo de vuelo, entre lo boca intracratérica en el fondo del cráter Principal y el Mirador, se estima entre 8 y 15 s a distancias entre 0,7 y 2,2 km. Se aportan una serie de recomendaciones para futuros estudios de balística volcánica y un nuevo modo de afrontar el problema físico, mediante las medidas de las bombas y su ángulo de impacto. Se recomienda la construcción de más refugios camino a los miradores del cráter Principal y del cráter Botos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract From April 12 until April 22 2017 Poás volcano experienced a new explosive phase with ballistic fragments reachingup to ~2,2 km. At its final phase non juvenile bocks predominated, product both of a 1953 lava body destruction and a lacustrinefloor, followed by an increment of juvenile fragments (glassy bread crust blocks, scoriaceous bombs and, rarely, fusiformbombs). The largest ones measured up to 20 m in diameter and 1,5 m in thickness, reaching up to 200 m from the crater. Thejuvenile fragments showed a varied vesiculation (15-50% vesicles) with a basaltic andesitic composition (phenocrysts of plag 20-22%, cpx 6-8%, opx 3-5%, lo 1-3%, mt 0-1%) within an intersertal matrix. The juvenile phreatomagmatic ash content increasedfrom approximated 9% to 85% at the end, consisting of a strombolian activity. When hitting the floor, the bombs generated perpendicularcooling joints and shear stress conjugate pairs. While cooling, the joints were parallel to impact surface generating asymmetric conjugated rectangular pattern. When fallon surfaces with a slope the pattern was more complex due to viscous flow.The ballistic initial velocity was estimated in the 100-300 ms-1 range, the final velocity was estimated in the 36-120 ms-1 range, anda terminal velocity (defined in the text) in the 124-250 ms-1 range. Flight time from bottom of Main crater to the visitor area (Viewpoint) was estimated in the 8-15 secs range. At the end, a set of recommendations for future volcanic ballistic studies is includedbased on a totally new physics model using actual range and impact angle. It is here recommended that more shelters be built onthe path between the active and Botos craters.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Balística]]></kwd>
<kwd lng="es"><![CDATA[Velocidades]]></kwd>
<kwd lng="es"><![CDATA[Freatomagmático]]></kwd>
<kwd lng="es"><![CDATA[Diaclasamiento de bombas]]></kwd>
<kwd lng="es"><![CDATA[Régimen newtoniano]]></kwd>
<kwd lng="en"><![CDATA[Ballistic]]></kwd>
<kwd lng="en"><![CDATA[Velocities]]></kwd>
<kwd lng="en"><![CDATA[Phreatomagmatic]]></kwd>
<kwd lng="en"><![CDATA[Bomb jointing;]]></kwd>
<kwd lng="en"><![CDATA[Newtonian regime]]></kwd>
</kwd-group>
</article-meta>
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