<?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>S0016-71692016000100079</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Differences in Epicentral Location of Mexican Earthquakes between Local and Global Catalogs: An update]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hjörleifsdóttir]]></surname>
<given-names><![CDATA[Vala]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[Shri Krishna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Husker]]></surname>
<given-names><![CDATA[Allen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>79</fpage>
<lpage>93</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692016000100079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692016000100079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692016000100079&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Differences in epicentral locations between local and global catalogs for earthquakes in the Mexican subduction zone were first observed to be biased in the 1980s, based on a few well studied events. In this study we compare locations between two local catalogs; (1) a recent high precision catalog of events in the state of Guerrero and (2) the catalog of the Servicio Sismológico Nacional (SSN), to the global catalog of the United States Geological Service (USGS). We find that on average epicentral locations in the global catalog of earthquakes larger than M 5 in the Mexican subduction zone are 26 km towards N54°E of those in the local catalogs. We investigate how the errors vary for different types of earthquakes in Guerrero, and how they vary along the trench, from the state of Jalisco to the state of Chiapas. The average differences are largest for thrust events occurring close to the trench, and for events in Michoacán. The differences are greater on average for large earthquakes than for small. There is a tradeoff between the distance from the trench and timing, suggesting a poor resolution of these parameters, due to the lack of stations the Pacific Ocean. We attribute the differences in locations to systematic patterns in the velocity structure of the mantle, with consistently fast paths to the northeast and relatively slow paths towards the southwest.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las diferencias en las localizaciones epicentrales entre catálogos locales y globales para sismos ocurridos en la zona de subducción mexicana fueron, primeramente, observados en 1980, con base en unos cuantos eventos bien estudiados. En este escrito se comparan las localizaciones de dos catágolos locales; (1) un catálogo reciente de alta precisión para la zona de Guerrero y (2) el catálogo del Servicio Sismológico Nacional (SSN), contra el catálogo global del United States Geological Service (USGS). Encontramos que en promedio las localizaciones epicentrales reportadas en los catálogos globales, para sismos de magnitudes mayores a 5, generados en la zona de subducción mexicana, se encuentran 26 km en dirección N54oE comparados con los reportados en catálogos locales. Investigamos cómo el error varía para diferentes tipos de sismos en Guerrero y cómo éstos mismos varían a lo largo de la trinchera, desde el estado de Jalisco hasta Chiapas. En promedio, las diferencias son mayores para sismos inversos ocurridos cerca de la trinchera y para eventos ocurridos en Michoacán. Las diferencias son mayores en promedio para eventos de magnitud mayor. Existe una compensación entre la distancia a la trinchera y el tiempo, lo cual indica una baja resolución para estos parámetros, debido a la falta de estaciones ubicadas en el Océano Pacífico. Las diferencias entre las localizaciones pueden ser atribuidas a un modelo sistemático en la estructura de velocidad para el manto, consistente con trayectorias rápidas al noreste y trayectorias lentas relativas al suroeste.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[seismicity]]></kwd>
<kwd lng="en"><![CDATA[mexican subduction zone]]></kwd>
<kwd lng="en"><![CDATA[earthquake location]]></kwd>
<kwd lng="es"><![CDATA[Sismicidad]]></kwd>
<kwd lng="es"><![CDATA[zona de subducción mexicana]]></kwd>
<kwd lng="es"><![CDATA[localización epicentral]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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