<?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>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692016000100055</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Tephra fall at Tungurahua Volcano (Ecuador) - 1999-2014: An Example of Tephra Accumulation from a Long-lasting Eruptive Cycle]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bustillos A.]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Jorge E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Troncoso]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara C.]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central del Ecuador Facultad de Geología Minas, Petróleos y Ambiental Carrera de Ingeniería en Geología]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Atacama Departamento de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela Politécnica Nacional Departamento de Metalurgia Extractiva ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>55</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692016000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692016000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692016000100055&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Tungurahua volcano awoke in 1999 after 75 years of quiescence, and its activity continues at the time of writing (2015). After fifteen years of eruptions, roughly 0.13 km3 of tephra have been released and deposited mainly to the west and southwest of the volcano. In order to describe the activity and understand the implications associated to its tephra emissions, we review the: 1) their distribution, 2) quantification of ejecta, 3) their components and 4) eruption dynamics. Most of the eruptions have consisted of short- lived explosions, Strombolian eruptions, hydro-volcanic interactions triggering Vulcanian eruptions, one Subplinian event and transitional style phases, which is supported by analysis of tephra components. Major tephra fallouts occurred in 2001, 2006, and 2014. The rate of tephra discharge increased almost 2.1 times from the pre-2006 period to the post- 2006 period. Tungurahua poses a continuing geological hazard across the adjacent regions, but also it is a natural laboratory for studying long-lasting eruptions and their effect.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El volcán Tungurahua despertó en 1999 después de 75 años de quietud, y su actividad continua hasta el presente (2015). Luego de quince años de erupciones, casi 0.13 km3 de tefra han sido emitidos y depositados principalmente hacia el oeste y suroeste del volcán. Con tal de describir la actividad volcánica y comprender las implicanciones asociadas a las emisiones de tefra, hemos revisado su: 1) distribución, 2) cuantificación, 3) componentes y 4) dinámica. La mayoría de las erupciones han consistido en explosiones discretas, erupciones Strombolianas, interacciones hidrovolcánicas desencadenando erupciones Vulcanianas, un evento Subpliniano y fases de transición de estilo, lo que es apoyado por el análisis de componentes de la tefra. Las mayores descargas de tefra han ocurrido en 2001, 2006 y 2014. La tasa de descarga de tefra ha incrementado en casi 2.1 veces entre el período previo a 2006 y el período posterior a 2006. El Tungurahua representa una fuente continua de peligro geológico sobre las regiones adyacentes, pero también es un laboratorio natural para el estudio de erupciones de larga duración y el efecto que estas tienen.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tephra]]></kwd>
<kwd lng="en"><![CDATA[explosive eruptions]]></kwd>
<kwd lng="en"><![CDATA[eruption style]]></kwd>
<kwd lng="en"><![CDATA[discharge rate]]></kwd>
<kwd lng="en"><![CDATA[eruptive volume]]></kwd>
<kwd lng="en"><![CDATA[Tungurahua]]></kwd>
<kwd lng="es"><![CDATA[Tefra]]></kwd>
<kwd lng="es"><![CDATA[erupciones explosivas]]></kwd>
<kwd lng="es"><![CDATA[estilo eruptivo]]></kwd>
<kwd lng="es"><![CDATA[tasa de descarga]]></kwd>
<kwd lng="es"><![CDATA[volumen emitido]]></kwd>
<kwd lng="es"><![CDATA[Tungurahua]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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