<?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>S0256-70242017000200023</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v0i57.30043</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Deformación sismotectónica a partir de mecanismos focales de terremotos en el Valle del Cauca, suroccidente de Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Seismotectonic deformation from focal mechanisms of earthquakes in the Valle del Cauca, southwestern Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salcedo]]></surname>
<given-names><![CDATA[Elkin de J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Jhon L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Valle Departamento de Geografía ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Valle Grupo GEORIESGOS - Observatorio Sismológico y Geofísico del Suroccidente Colombiano]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<numero>57</numero>
<fpage>23</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242017000200023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242017000200023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242017000200023&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenSe analiza el régimen de deformación sismotectónica en el Valle del Cauca, suroccidente de Colombia, usando datos de mecanismos focales de 49 terremotos con magnitud Mw&#8805;4,8 en el periodo 1976-2010, tomados de la base de datos del ISC (International Seismological Center) y del GCMT (Global Centroid Moment Tensor). Se considera la distribución de los tipos de mecanismos focales, reconociendo cuatro ambientes de deformación sismotectónica: Zona antes de la fosa (Ambiente-I), Zona de flexión e interacción interplacas (Ambiente-II), Zona continental superficial (Ambiente-III) y Zona de Benioff intermedia (Ambiente-IV). En términos generales, las características geodinámicas de estos ambientes están gobernadas por la subducción de la placa oceánica bajo la continental. Se estimó un ángulo de inclinación de 30° para la zona de flexión, generando un esfuerzo tangencial deformante (&#964;s ) de 7,67*1022 Pa, una fuerza tangencial (Fs) de 1,06*1027 N/m, una fuerza normal (Fn) equivale a 1,47*1028 N/m y una fuerza de arrastre de la placa subducida de 1,57*1028 N/m. El coeficiente de acoplamiento sísmico interplaca es de 0,21, lo que sugiere una zona de subducción de actividad intermedia. Por otro lado, la velocidad de dislocación y de hundimiento de la placa oceánica, respectivamente, tienen valores de vs = 3,68 cm/año y vd = 2,76 cm/año. Estas características geodinámicas y cinemáticas explican la frecuente ocurrencia de eventos sísmicos de pequeños a moderados (2&#8804;M&#8804;5), así como la ocurrencia de un posible sismo de magnitud Mw&#8805;7 en la región.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractUsing data of focal mechanisms, we analyzed the seismotectonic strain regime in the Valle del Cauca, of southwestern Colombia, 49 earthquakes were selected with magnitude Mw&#8805;4.8 within the period of 1976 to 2010. This data was taken from ISC (International Seismological Center) and GCMT (Global Centroid Moment Tensor) database. According with the spatial distribution of different types of focal mechanisms, we recognize four main seismotectonic deformation zones: the seaward side of the trench (Environment-I), the bending and interplate interaction zone (Environment-II), the shallow continental zone (Environment-III), and the intermediate Benioff zone (Environment-IV). Overall, the geodynamic features of these environments are controlled by the subduction zone. We obtained that the bending zone has an angle of inclination of 30°, which generates a tangential deformation stress (&#964;s ) with a magnitude of 7.67*1022 Pa; a tangential force (Fs) of 1.06*1027 N/m, and a normal force (Fn) equivalent to 1.47*1028 N/m with a slab pull force of 1.57*1028 N/m. Moreover, the interplate seismic coupling coefficient is 0.21, suggesting a subduction zone of intermediate activity. On the other hand, the dislocation velocity (vs) and subsidence velocity (vd) of the oceanic plate are 3.68 cm/year and 2.76 cm/year, respectively. These geodynamic and kinematic characteristics explain the frequent seismic events of small to moderate intensity (2&#8804;M&#8804;5), and the occurrence of a possible earthquake with Mw&#8805;7 magnitude in the region.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Earthquakes]]></kwd>
<kwd lng="en"><![CDATA[focal mechanisms]]></kwd>
<kwd lng="en"><![CDATA[seismotectonic deformation]]></kwd>
<kwd lng="en"><![CDATA[Valle del Cauca]]></kwd>
<kwd lng="en"><![CDATA[southwestern Colombia]]></kwd>
<kwd lng="es"><![CDATA[Terremotos]]></kwd>
<kwd lng="es"><![CDATA[mecanismos focales]]></kwd>
<kwd lng="es"><![CDATA[deformación sismotectónica]]></kwd>
<kwd lng="es"><![CDATA[Valle del Cauca]]></kwd>
<kwd lng="es"><![CDATA[suroccidente colombiano]]></kwd>
</kwd-group>
</article-meta>
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<publisher-name><![CDATA[John Wiley and Sons.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B56">
<nlm-citation citation-type="">
<collab>USGS</collab>
<source><![CDATA[Map of Quaternary Faults and Folds of Colombia and Its Offshore Regions (escala 1: 2 500 000)]]></source>
<year>2000</year>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
