<?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>S0016-71692025000301721</article-id>
<article-id pub-id-type="doi">10.22201/igeof.2954436xe.2025.64.3.1749</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Seismicity Associated to a Shield Volcano in a Monogenetic Volcanic Field: The Case of San Martin Tuxtla Volcano, Veracruz, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espíndola]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamora-Camacho]]></surname>
<given-names><![CDATA[Araceli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espíndola]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de la Costa ]]></institution>
<addr-line><![CDATA[Puerto Vallarta Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<volume>64</volume>
<numero>3</numero>
<fpage>1721</fpage>
<lpage>1730</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692025000301721&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692025000301721&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692025000301721&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract San Martin Tuxtla is a basaltic shield volcano (SMTV) rising in the Los Tuxtlas volcanic field (LTVF), Veracruz, Mexico. The volcano had explosive eruptions in 1793 and presumably in 1664 without showing any felt premonitory activity. The 1793 eruption, in particular, consisted of strong Strombolian phases that dispersed a large amount of ash, causing panic among the region's inhabitants. Despite these precedents, no current monitoring of the volcano is carried out. In this work, we present the results of the analyses of seismic records from three broadband seismic stations deployed around San Martin Tuxtla from 2007 to 2013. These results provide background information on the current seismicity associated to the volcano. About 60 microearthquakes were recorded clearly, with magnitudes between 0.2 and 2.4. Twenty-five of the mentioned events were relocated using the double difference method to improve their location, with nine suitable for yielding focal mechanisms through S phase fitting. The data from the SSN and the characteristics of nine moderate earthquakes with foci in the vicinity of the LTVF are included as background information on the region's seismicity. The results should be helpful as a background to help plan the monitoring of the San Martin Tuxtla volcano and compare any future seismic activity associated with the volcano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El volcán San Martín Tuxtla es un volcán basáltico de escudo (SMTV) en el campo volcánico de Los Tuxtlas (LTVF), Veracruz, México. El volcán presentó erupciones explosivas en 1793, y presumiblemente en 1664, sin actividad premonitoria sentida por la población aledaña. La actividad de 1793, en particular, consistió en varias etapas de fuertes fases estrombolianas en la que se esparcieron grandes cantidades de ceniza volcánica que llenaron de temor a los habitantes de la región. A pesar de estos antecedentes, actualmente no se realiza ninguna vigilancia del volcán. Para obtener información básica sobre las condiciones internas del volcán, presentamos los resultados de los análisis de registros sísmicos de tres sismógrafos de banda ancha desplegadas alrededor del San Martín Tuxtla durante el periodo 2007-2013. Se registraron claramente unos 60 microsismos con magnitudes de entre 0.2 y 2.4. Veinticinco de los eventos mencionados fueron relocalizados con el método de doble diferencia para mejorar su localización. Además, se obtuvo el mecanismo focal de nueve eventos mediante el ajuste de la onda S. Los datos del SSN y las características de nueve terremotos moderados con focos en las proximidades de LTVF se incluyen como antecedentes sobre la sismicidad en la región. Los resultados son de utilidad para comparar la actividad que pudiera presentarse en caso de una reactivación del volcán y para la planificación del monitoreo de la actividad volcánica en el volcán San Martín Tuxtla.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[San Martin Tuxtla volcano]]></kwd>
<kwd lng="en"><![CDATA[Tuxtlas volcanic field]]></kwd>
<kwd lng="en"><![CDATA[Basaltic eruptions]]></kwd>
<kwd lng="en"><![CDATA[Volcanic seismicity]]></kwd>
<kwd lng="en"><![CDATA[Monogenetic Volcanic fields]]></kwd>
<kwd lng="es"><![CDATA[Actividad sísmica volcánica]]></kwd>
<kwd lng="es"><![CDATA[Volcán San Martín Tuxtla]]></kwd>
<kwd lng="es"><![CDATA[Vulcanismo monogenético]]></kwd>
<kwd lng="es"><![CDATA[Zona volcánica de Los Tuxtlas]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[Veracruz]]></kwd>
</kwd-group>
</article-meta>
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