<?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>S0016-71692021000400320</article-id>
<article-id pub-id-type="doi">10.22201/igeof.00167169p.2021.60.4.2119</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Wavelet-based Characterization of Seismicity and Geomagnetic Disturbances in the South Sandwich Microplate Area]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Larocca]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arecco]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Buenos Aires Facultad de Ingeniería Instituto de Geodesia y Geofísica Aplicadas]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la Defensa Nacional Instituto Universitario Naval Escuela de Ciencias del Mar]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>60</volume>
<numero>4</numero>
<fpage>320</fpage>
<lpage>332</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692021000400320&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692021000400320&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692021000400320&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper analyzes geomagnetic disturbances associated with seismic events in the northern transcurrent margin of the South Sandwich microplate and South American plate, with their epicenter at distances within 350 km from King Edward Point geomagnetic observatory on the archipelago of the Georgias del Sur islands. Geomagnetic field records measured over a one-year period in three observatories of the INTERMAGNET network near the area under study are examined. Anomalous variations in geomagnetic records can be detected within approximately 3 hours before the manifestation of seismic events with a magnitude above 4.4 Mw. Based on the analysis of the differences in horizontal field components among the observatories and the frequency spectrum of the geomagnetic field observations using the wavelet method, oscillations of several nT can be observed before an event' in addition to magnetic peaks with variable amplitude and duration. It is worth noting that, during the period of study, no severe geomagnetic storms were recorded as this was a phase of low solar activity (solar cycle 24 minimum). The observation of these potential magnetic precursors suggests that there is a critical preparatory period in a region with geological faults related to the stress generated in the rocks before the built-up energy is released in the hypocenter area, within the lithosphere, which may possibly predict the mechanical motion based on anomalous geomagnetic records.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este trabajo se analizan perturbaciones geomagnéticas relacionadas con eventos sísmicos localizados en el margen transcurrente norte de la micro Placa de Sandwich del Sur y la placa Sudamericana, con epicentro a distancias menores de 350 km del observatorio geomagnético King Eduard Point en el archipiélago de las islas Georgias del Sur. Se estudian registros del campo geomagnético medido en tres observatorios de la red INTERMAGNET próximos a la zona de estudio en un lapso de 1 año. Es posible detectar variaciones anómalas en los registros geomagnéticos en lapsos de aproximadamente 3 horas antes de la manifestación de eventos sísmicos de magnitud superior a 4,4 Mw. A partir del análisis de las diferencias entre las componentes horizontales del campo de los observatorios King Eduard Point y Orcadas y el espectro de frecuencias de las observaciones de campo geomagnético, a partir del método de wavelet es posible observar oscilaciones de varios nT previas al evento, además de picos magnéticos de amplitud y duración variable. Cabe destacar que en el periodo de estudio no se registraron tormentas geomagnéticas intensas o superintensas por encontrarse en fase de baja actividad solar (mínimo de ciclo solar 24). La observación de estos posibles premonitores magnéticos sugiere que hay un tiempo de preparación crítico en una región de fallas geológicas relacionado con la tensión generada en las rocas previo a la liberación de la energía acumulada en la zona del hipocentro, en el interior de la litosfera' que podría anticipar el movimiento mecánico a partir de registros geomagnéticos anómalos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[geomagnetic variations]]></kwd>
<kwd lng="en"><![CDATA[earthquakes]]></kwd>
<kwd lng="en"><![CDATA[geomagnetic activity indices]]></kwd>
<kwd lng="es"><![CDATA[variaciones geomagnéticas]]></kwd>
<kwd lng="es"><![CDATA[sismos]]></kwd>
<kwd lng="es"><![CDATA[índices de actividad geomagnética]]></kwd>
</kwd-group>
</article-meta>
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