<?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>0120-0283</journal-id>
<journal-title><![CDATA[Boletín de Geología]]></journal-title>
<abbrev-journal-title><![CDATA[bol.geol.]]></abbrev-journal-title>
<issn>0120-0283</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-02832019000200015</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v41n2-2019001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Neotectónica de la falla Cipreses, Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Neotectonic of the Cipreses fault, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Evelyn]]></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"/>
<xref ref-type="aff" rid="Aaf"/>
</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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Red Sismológica Nacional ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Centro de Investigaciones en Ciencias Geológicas ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>15</fpage>
<lpage>33</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832019000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832019000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832019000200015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La falla Cipreses se localiza en la parte central de Costa Rica, en la zona más poblada del país. En esta investigación se analiza esta falla a partir de aspectos geomorfológicos, geológicos y sismológicos. Las principales evidencias geomorfológicas encontradas son: escarpes, terrazas y ríos encajonados, desviados y represados. Geológicamente en los alrededores de la falla prevalecen tres litologías de edad pleistocena: tobas, brechas y lavas andesíticas, las cuales fueron encontradas desplazadas por la falla en un afloramiento. Del análisis sismológico se concluye que la sismicidad instrumental en la zona es escasa pero al menos un sismo ocurrido en el 2010 (Mw 4,1) fue originado en la falla Cipreses. La solución del mecanismo focal de este sismo es de tipo inverso, con un plano nodal de dirección de buzamiento N30°E/35° consistente con el plano de falla observado en el campo y con las evidencias geomorfológicas. A partir de un modelo conceptual del fallamiento, se interpreta que la falla Cipreses corresponde con una falla maestra que se propaga hacia la superficie en dos segmentos de falla denominados Pinares y Guayabos. Los desplazamientos en estas fallas generan dos pliegues de tipo anticlinal que están expresados superficialmente como escarpes prominentes. Las evidencias recabadas permiten concluir que la falla Cipreses es activa, de tipo inverso, con una expresión en superficie de 14 km y con un potencial sísmico de magnitud Mw 5,9-6,5.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Cipreses fault is located in the central part of Costa Rica, in the most populated region of the country. In this paper, the Cipreses fault is analyzed based on geomorphological, geological, and seismological observations.The main geomorphological evidences found are: scarps, terraces, river incisions, and deflected and dammed streams. In the vicinity of the fault, there are three main Pleistocene geologic units: tuff, breccia, and andesitic lavas. These units were found displaced by the fault in an outcrop. From the seismological analysis, we conclude that the instrumental seismicity is low, but at least one earthquake in 2010 (4.1 Mw) was originated in the Cipreses fault. The focal mechanism solution for this event indicates a thrust fault with a nodal plane of dip direction N30°E/35° in agreement with the fault plane found in the field and the geomorphological observations. Based on a conceptual model for the faulting, we interpret that the Cipreses fault corresponds to a master fault that propagates to the surface along two fault segments named Pinares and Guayabos. The displacements of these faults made two anticlinal folds, which are expressed at the surface as prominent scarps. Based on the evidences found we conclude that the Cipreses fault is an active thrust fault with a surface expression of 14 km and with the seismic potential of magnitude Mw 5.9-6.5.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Costa Rica]]></kwd>
<kwd lng="es"><![CDATA[falla activa]]></kwd>
<kwd lng="es"><![CDATA[falla Cipreses]]></kwd>
<kwd lng="es"><![CDATA[neotectónica.]]></kwd>
<kwd lng="en"><![CDATA[Costa Rica]]></kwd>
<kwd lng="en"><![CDATA[active fault]]></kwd>
<kwd lng="en"><![CDATA[Cipresses Fault]]></kwd>
<kwd lng="en"><![CDATA[neotectonics.]]></kwd>
</kwd-group>
</article-meta>
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