<?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>S0016-71692019000100049</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Fragmentation behavior of eruptive products of Popocatépetl volcano: an experimental contribution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alatorre-Ibargüengoitia]]></surname>
<given-names><![CDATA[Miguel Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arciniega-Ceballos]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Linares López]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dingwell]]></surname>
<given-names><![CDATA[Donald B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado-Granados]]></surname>
<given-names><![CDATA[Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciencias y Artes de Chiapas Instituto de Investigación en Gestión de Riesgo y Cambio Climático ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Departamento de Vulcanología]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Ludwig Maximilians University of Munich Department of Earth and Environmental Sciences ]]></institution>
<addr-line><![CDATA[ Munich]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<volume>58</volume>
<numero>1</numero>
<fpage>49</fpage>
<lpage>72</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692019000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692019000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692019000100049&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The fragmentation behavior of eruptive products from Popocatépetl has been investigated ex perimentally in a shock-tube apparatus. Ra pid decompression experiments have been performed that mimic Vulcanian explosions that have occurred at Popocatépetl since its reawakening in 1994. We detail the behavior of several fragmentation parameters including the fragmentation threshold, fragmentation speed, ejection velocity and fragmentation efficiency. Our results confirm that the connected porosity of the rock and the applied pressure are strong influences on the fragmentation process. The values of the fragmentation threshold presented here provide quantitative constraints on the overpressure required to generate an explosion at Popocatépetl. We also present the first experimental estimates of the fragmentation speed at magmatic temperatures. We have further applied fractal fragmentation theory to the experimentally-generated pyroclasts to evaluate fragmentation efficiency and we observe thereby that groundmass texture and composition may play an important role in the grain-size distribution. The grain-size distributions of ash fall deposits from several explosive events of Popocatépetl exhibit a fractal dimension higher than the experimentally-generated particles, consistent with the occurrence of secondary fragmentation processes at Popocatépetl. Finally, we analyzed and discussed the in formation extracted from elasto-acoustic sig nals associated with the dynamic behavior of the fragmentation process triggered by rapid decompression. The analysis of the ex perimental results provided in this work are useful for the calibration of eruptive models, the interpretation of the data obtained from monitoring techniques of intermediate compo sition volcanoes that produce Vulcanian e ruptions and may thereby contribute to the improvement of hazard assessment at high risk volcanoes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este artículo se presenta un estudio experi mental del comportamiento de fragmentación de muestras naturales del volcán Popocatépetl en un tubo de choque. Estos experimentos simulan explosiones Vulcanianas como las que han ocurrido en el volcán Popocatépetl desde su reactivación en 1994. Aquí detallamos el comportamiento de varios parámetros incluyendo la presión umbral de fragmentación, rapidez de fragmentación, velocidad de emisión y eficiencia de fragmentación. Nuestros resultados indican que la porosidad interconectada de la roca y la presión aplicada ejercen una fuerte influencia en el proceso de fragmentación. Los valores de la presión umbral de fragmentación que se presentan aquí proporcionan estimaciones cuantitativas de la sobrepresión requerida para generar una explosión en el volcán Popocatépetl. Así mismo, presentamos las primeras estimaciones de la rapidez de fragmentación a temperaturas magmáticas. La eficiencia de fragmentación de los piroclastos generados experimentalmente es evaluada a través de la teoría fractal de fragmentación y observamos que su granulometría puede ser influenciada significativamente por la composición y la textura de la matriz. La granulometría de depósitos de caía asociados a diferentes eventos explosivos del volcán Popocatépetl también muestran un comportamiento fractal, pero con dimensiones fractales mayores a las correspondientes a las partículas generadas experimentalmente, lo cual es consistente con la ocurrencia de procesos de fragmentación secundarios durante las erupciones. Finalmente, presentamos información extraída de señales elastoacústicas asociadas con los procesos de fragmentación. El análisis de los resultados experimentales que se presentan aquí son útiles para calibrar modelos eruptivos e interpretar datos de monitoreo de las erupciones de volcanes con composición intermedia y de este modo contribuyen al mejoramiento de la evaluación del peligro de estos riesgosos volcanes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Volcán Popocatépetl]]></kwd>
<kwd lng="es"><![CDATA[erupcio nes volcánicas]]></kwd>
<kwd lng="es"><![CDATA[erupciones Vulcanianas]]></kwd>
<kwd lng="es"><![CDATA[peligros volcánicos]]></kwd>
<kwd lng="es"><![CDATA[experimentos]]></kwd>
<kwd lng="es"><![CDATA[fragmentación mag mática]]></kwd>
<kwd lng="es"><![CDATA[tubo de choque]]></kwd>
<kwd lng="en"><![CDATA[Popocatépetl Volcano]]></kwd>
<kwd lng="en"><![CDATA[volcanic erup tions]]></kwd>
<kwd lng="en"><![CDATA[Vulcanian eruptions]]></kwd>
<kwd lng="en"><![CDATA[experiments]]></kwd>
<kwd lng="en"><![CDATA[magmatic fragmentation]]></kwd>
<kwd lng="en"><![CDATA[shock-tube]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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