<?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>S0016-71692005000400331</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microzonation of the Linares, Northeast Mexico area, based on geology and shear-wave velocity measurements]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montalvo-Arrieta]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintanilla]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meneses]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Masuch]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UANL Facultad de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[Linares N.L.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<volume>44</volume>
<numero>4</numero>
<fpage>331</fpage>
<lpage>340</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692005000400331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692005000400331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692005000400331&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We determined the velocity structure of S-wave (VS), P-wave (VP) and the average shear velocity to 30 meters depth (Vs30) at 30 locations in the Linares, Nuevo León area. V  s and V  P measurements were made from seismic refraction profiles. Four different lithologic units were defined in the upper 30 m: silts with 338 m/s and 221 m/s for V  P and V  s respectively, which correspond to the lowest velocities measured in the area; Quaternary deposits with 957 m/s and 559 m/s for VP and VS; Tertiary conglomerates with 2471 m/s and 1220 m/s for V  P and Vs; and shales of the Upper Cretaceous Mendez Formation with 3195 m/s and 2149 m/s for V  P and Vs. Sites of class C (Vs30 &lt; 760 m/s) are dominant in the area, corresponding to maximum thicknesses of less than 16 m of soft sediments.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En este trabajo se ha definido la estructura de velocidades de ondas S (VS) y P (Vp), así como el promedio de velocidades ( v s30 ) para los primeros 30 metros del subsuelo, a partir de perfiles sísmicos de refracción en el área de Linares, Nuevo León, tomándose como indicador de las condiciones de sitio. Se identificaron cuatro diferentes unidades litológicas para estos 30 m de profundidad: limos con velocidades de V  P y V  s de 338 m/s y 221 m/s, los cuales corresponden a los valores más bajos y someros (primeros 3 m) medidos en el área; aluvión (depósitos Cuaternarios) con velocidades respectivas de V  P y V  s de 957 m/s y 559 m/ s; conglomerados (Terciario) con velocidades de V  P y V  s de 2471 m/s y 1220 m/s; finalmente lutitas de la Formación Méndez (Cretácico Superior) con velocidades de V  P y V  s de 3195 m/s y 2149 m/s respectivamente. De acuerdo con códigos internacionales de construcción aplicados a la clasificación de suelos y rocas (por ejemplo, the National Earthquake Hazard Reduction Program, USA, por sus siglas en inglés) en el área de estudio predominan los sitios clase C (Vs30 &lt; 760 m/s), los cuales presentan una correspondencia con los espesores máximos (&#8804; 16m) de sedimentos suaves observados en el área de estudio.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Datos de pozo]]></kwd>
<kwd lng="es"><![CDATA[curvas de tiempo de viaje]]></kwd>
<kwd lng="es"><![CDATA[estructura sísmica de velocidades]]></kwd>
<kwd lng="es"><![CDATA[sismicidad]]></kwd>
<kwd lng="es"><![CDATA[efectos de sitios]]></kwd>
<kwd lng="es"><![CDATA[perfiles sísmicos de refracción]]></kwd>
<kwd lng="en"><![CDATA[Borehole data]]></kwd>
<kwd lng="en"><![CDATA[travel time curves]]></kwd>
<kwd lng="en"><![CDATA[seismic velocity structure]]></kwd>
<kwd lng="en"><![CDATA[seismicity]]></kwd>
<kwd lng="en"><![CDATA[site effects]]></kwd>
<kwd lng="en"><![CDATA[seismic refraction profiles]]></kwd>
</kwd-group>
</article-meta>
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