<?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>S0256-70242017000200007</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v0i57.30041</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Application of the double difference earthquake relocation algorithm methodology using hypodd at four seismic sequences in Costa Rica]]></article-title>
<article-title xml:lang="es"><![CDATA[Aplicación de la metodología de relocalización de sismos con el algoritmo de doble diferencia usando hypodd en cuatro secuencias sísmicas en 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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica 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>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<numero>57</numero>
<fpage>7</fpage>
<lpage>21</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242017000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242017000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242017000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractSeveral seismic sequences occur during a year in Costa Rica. When registered at the National Seismological Network, each earthquake is located to update the national catalog. The analysis and characterization of the sequence clusters is then done by manual relocation only. This study includes four sequences, post-processed by manual location, event cross-correlation, and cluster relocation with a double difference algorithm; this, to give a more accurate location of the source. The sequences processed consist of 21 to 64 earthquakes, and occurred in a period of 3 to 21 days. Each event was registered in at least 27 stations, with 105º of station coverage, and a maximum hypocentral distance of 11 km between events. After the manual relocation, the quality of the event locations was analyzed to fulfill the requirements for the event cross-correlation and the double difference methodology. The results show a reduction from two to twenty times the initial hypocentral distance, also in the relative error for each individual event that help reduce the source area for each sequence.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenVarias secuencias sísmicas ocurren durante un año en Costa Rica. Cuando estas son registradas por la Red Sismológica Nacional, cada evento es localizado para el catálogo nacional. El análisis y la caracterización del conjunto se hace luego con solo la localización manual. Este estudio incluye el post proceso de cuatro secuencias sísmicas con localización manual, correlación cruzada de eventos y relocalización con un algoritmo de doble diferencia para ubicar de una manera más precisa la fuente de estos eventos. Las secuencias agrupan desde 21 hasta 64 sismos, y ocurrieron en 3 a 21 días. Cada evento fue registrado en al menos 27 estaciones, con una cobertura mínima de 105º alrededor del evento. La distancia hipocentral máxima entre eventos es de 11 km. Luego de la localización manual, los eventos que cumplieron con las características necesarias fueron seleccionados para la correlación cruzada entre eventos y el análisis de doble diferencia. Los resultados muestran una reducción de 2 hasta 20 veces la distancia hipocentral, y se delimita la ubicación de la fuente de cada secuencia sísmica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Double difference algorithm]]></kwd>
<kwd lng="en"><![CDATA[cross-correlation]]></kwd>
<kwd lng="en"><![CDATA[seismic sequence]]></kwd>
<kwd lng="en"><![CDATA[earthquake]]></kwd>
<kwd lng="en"><![CDATA[upper crust seismicity]]></kwd>
<kwd lng="es"><![CDATA[Algoritmo de doble diferencia]]></kwd>
<kwd lng="es"><![CDATA[correlación cruzada]]></kwd>
<kwd lng="es"><![CDATA[secuencias sísmicas]]></kwd>
<kwd lng="es"><![CDATA[sismos]]></kwd>
<kwd lng="es"><![CDATA[sismicidad en la corteza superior]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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