<?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>S0256-70242015000200089</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v53i0.21145</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Tobosi fault: source of the 2011-2012 Tobosi earthquake swarm in central Costa Rica]]></article-title>
<article-title xml:lang="es"><![CDATA[La falla Tobosi: fuente del enjambre sísmico de Tobosi del 2011-2012 en el centro de Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araya]]></surname>
<given-names><![CDATA[María C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Linkimer]]></surname>
<given-names><![CDATA[Lepolt]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero]]></surname>
<given-names><![CDATA[Walter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Wilfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Red Sismológica Nacional (RSN: UCR-ICE) Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[San Pedro ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Red Sismológica Nacional (RSN: UCR-ICE) Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[San Pedro ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Red Sismológica Nacional (RSN: UCR-ICE) Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[San Pedro ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica Red Sismológica Nacional (RSN: UCR-ICE) Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[San Pedro ]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<numero>53</numero>
<fpage>89</fpage>
<lpage>102</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242015000200089&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242015000200089&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242015000200089&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:The Central Costa Rica Deformed Belt (CCRDB) is an ~100-km broad zone of deformation that marks the boundary between the Caribbean Plate and the Panama Microplate. From December 2011 to February 2012, an earthquake swarm took place in a portion of the CCRDB, near the town of Tobosi, 7 km southwest of the city of Car-tago. In this study, data recorded by the National Seismological Network of Costa Rica (RSN: UCR-ICE) is used to relocate the earthquakes and calculate their focal mechanisms. Additionally, the tectonic geomorphology of the region is analyzed. The results show a transtension structure near the town of Tobosi, which comprises at least three faults, named: the Tobosi, Tablon, and Alumbre faults. It was found that the Tobosi fault is an active left-lateral strike-slip fault with a normal component and was the source of the Tobosi earthquake swarm.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:El Cinturón Deformado del Centro de Costa Rica (CCRDB) es una zona de deformación de ~100 km de ancho que representa el límite entre la Placa Caribe y la Microplaca de Panamá. Entre diciembre 2011 y febrero 2012 ocurrió un enjambre de sismos en un segmento del CCRDB ubicado en las cercanías del poblado de Tobosi, 7 km al suroeste de la ciudad de Cartago. En este estudio se utilizaron los registros de la Red Sismológica Nacional (RSN:UCR-ICE) para relocalizar los sismos y calcular sus mecanismos focales. Asimismo, se realizó un estudio de la geomorfología tectónica de la zona. Los resultados evidencian una estructura de transtensión compuesta por al menos tres fallas, llamadas: Tobosi, Tablón y Alumbre. Este estudio demuestra que la Falla Tobosi es una falla activa la cual presenta un movimiento de tipo sinestral con componente normal y fue el origen del enjambre de sismos de Tobosi.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Active fault]]></kwd>
<kwd lng="en"><![CDATA[earthquake swarm]]></kwd>
<kwd lng="en"><![CDATA[seismic hazard]]></kwd>
<kwd lng="en"><![CDATA[Tobosi]]></kwd>
<kwd lng="en"><![CDATA[Costa Rica]]></kwd>
<kwd lng="en"><![CDATA[focal mechanisms]]></kwd>
<kwd lng="es"><![CDATA[Falla activa]]></kwd>
<kwd lng="es"><![CDATA[enjambre sísmico]]></kwd>
<kwd lng="es"><![CDATA[amenaza sísmica]]></kwd>
<kwd lng="es"><![CDATA[Tobosi]]></kwd>
<kwd lng="es"><![CDATA[Costa Rica]]></kwd>
<kwd lng="es"><![CDATA[mecanismos focales.]]></kwd>
</kwd-group>
</article-meta>
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