<?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>S0256-70242020000200001</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v63i0.43403</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Las erupciones relevantes del Rincón de la Vieja en los últimos 6000 años basado en tefrocronoestratigrafía sobre su flanco SW]]></article-title>
<article-title xml:lang="en"><![CDATA[The relevant eruptions of Rincón de la Vieja in the last 6000 years based on tephrostratigraphy on his SW slope]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[Irene L.]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Costarricense de Electricidad (RSN: ICE-UCR), Área de Amenazas y Auscultación Sismológica y Volcánica, Observatorio Sismológico y Vulcanológico de Arenal y Miravalles (Osivam), ]]></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, Comisión ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<numero>63</numero>
<fpage>1</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242020000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242020000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242020000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El volcán Rincón de la Vieja es el único volcán de la cordillera de Guanacaste que ha presentado actividad histórica y es de los pocos en el mundo que posee un lago caliente y ácido en su cráter. El presente trabajo muestra nuevas dataciones radiométricas del Holoceno Medio al Holoceno Superior (últimos 6000 años), base fundamental para los estudios de amenaza volcánica. Los resultados muestran que su actividad prehistórica reciente ha sido mucho más violenta, con erupciones plinianas, subplinianas, vulcanianas y estrombolianas. Durante su corta actividad histórica (1700-2020), ha presentado eventos freatosurtseyanos y freatomagmáticos con caída de ceniza, balística, lluvia ácida y generación de lahares calientes y fríos, tanto sineruptivos como poseruptivos o secundarios. Los depósitos que afloran a 10 km al WSW del cráter activo están constituidos de capas de cenizas y pómez de caída y oleadas, algunas subplinianas (3650 a. C., 1130 a. C., 460 d. C., 1040 d. C., 1650 d. C.) y, dentro de ellas, la capa pliniana Río Blanco (460 d. C.), con una edad mucho más joven que lo que se maneja en la literatura. Se recalculó el volumen del depósito asociado con la erupción de río Blanco (pómez de caída pliniana y corrientes de densidad piroclástica) en 1,21 km3 y la altura de la columna eruptiva en 30 km con un VEI 5. Para los últimos 2 ka, los periodos de recurrencia de los grandes eventos eruptivos (VEI &gt; 4) podrían ser de unos 600 años, mientras que eventos menores (VEI 3) se podrían presentar antes de finalizar el presente siglo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Rincón de la Vieja volcano the only volcano in the Guanacaste mountain range that has historical activity and is one of the few in the World that has a hot and acid lake in its crater. The present work shows new radiometric dates from the Middle Holocene to the Upper Holocene (last 6000 years), fundamental information for volcanic hazards studies. Its prehistoric activity was significantly more violet, with Plinian, Sub-Plinian, Vulcanian and Strombolian eruptions. During its historical activity (1700-2020), Rincón de la Vieja volcano has presented freatosurtseyan and phreatomagmatic events, with tefra fall,acid rain and generation of hot lahars. The deposits 10 km away from the active crater on the SSW flank are ash and pumice (Sub-Plinian and Plinian) and piroclastic surge deposits (3650 a. C., 1130 a. C., 460 A. D., 1040 A. D., 1650 A. D.) and, within them, the Plinian Río Blanco layer (450 A. D.), was dated at a younger age than previously reported in the literature. The volume of the deposit associated with the eruption of Río Blanco (pumice fall and pyroclastic density currents deposits) has been recalculated to 1.21 km3, and the height of the eruptive column to 30 km with a VEI 5. For the last 2 ka, the periods of recurrence of large eruptive events (VEI &gt; 4) could be about 600 years, while minor events (VEI 3) could occur before the end of this century.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Rincón de la Vieja]]></kwd>
<kwd lng="es"><![CDATA[depósito pliniano Río Blanco]]></kwd>
<kwd lng="es"><![CDATA[frecuencia eruptiva]]></kwd>
<kwd lng="es"><![CDATA[Holoceno Medio]]></kwd>
<kwd lng="es"><![CDATA[Holoceno Reciente]]></kwd>
<kwd lng="es"><![CDATA[actividad histórica eruptiva]]></kwd>
<kwd lng="en"><![CDATA[Rincon de la Vieja]]></kwd>
<kwd lng="en"><![CDATA[Rio Blanco plinian deposit]]></kwd>
<kwd lng="en"><![CDATA[eruptive frequency]]></kwd>
<kwd lng="en"><![CDATA[Middle Holocene]]></kwd>
<kwd lng="en"><![CDATA[Upper Holocene]]></kwd>
<kwd lng="en"><![CDATA[historical eruptive activity]]></kwd>
</kwd-group>
</article-meta>
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