<?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>1794-6190</journal-id>
<journal-title><![CDATA[Earth Sciences Research Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Earth Sci. Res. J.]]></abbrev-journal-title>
<issn>1794-6190</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-61902020000100091</article-id>
<article-id pub-id-type="doi">10.15446/esrj.v24n1.85366</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Group Velocity Measurements of Earthquake Rayleigh Wave by S Transform and Comparison with MFT]]></article-title>
<article-title xml:lang="es"><![CDATA[Mediciones de la velocidad de grupo de las ondas sísmicas Rayleigh mediante la transformada S y comparación con la Técnica de Filtrado Múltiple (MFT)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiang]]></surname>
<given-names><![CDATA[Chanjun]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Youxue]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zeng]]></surname>
<given-names><![CDATA[Gaofu]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Guilin University of Technology  ]]></institution>
<addr-line><![CDATA[Guilin ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Guangxi Key Laboratory of Hidden Metallic  ]]></institution>
<addr-line><![CDATA[Guilin ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Guilin University of Technology  ]]></institution>
<addr-line><![CDATA[Guilin ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Geology and Mining Co,. Ltd  ]]></institution>
<addr-line><![CDATA[Guilin ]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>95</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-61902020000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-61902020000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-61902020000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Based upon the synthetic Rayleigh wave at different epicentral distances and real earthquake Rayleigh wave, S transform is used to measure their group velocities, compared with the Multiple Filter Technique (MFT) which is the most commonly used method for group-velocity measurements. When the period is greater than 15 s, especially than 40 s, S transform has higher accuracy than MFT at all epicenter distances. When the period is less than or equal to 15 s, the accuracy of S transform is lower than that of MFT at epicentral distances of 1000 km and 8000 km (especially 8000 km), and the accuracy of such two methods is similar at the other epicentral distances. On the whole, S transform is more accurate than MFT. Furthermore, MFT is dominantly dependent on the value of the Gaussian filter parameter a , but S transform is self-adaptive. Therefore, S transform is a more stable and accurate method than MFT for group velocity measurement of earthquake Rayleigh waves.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Con base en ondas sintéticas Rayleigh a diferentes distancias epicentrales y en ondas sísmicas Rayleigh reales, en este trabajo se emplea la transformada S para medir la velocidad de grupo de este tipo de ondas y se compara con la Técnica de Filtrado Múltiple (MFT, por sus siglas del inglés, del nomre Múltiple Filter Technique), que es el método más utilizado para las mediciones de velocidad de grupo. Cuando el periodo es mayor a 15 s, especialmente de 40 s, la transformada S tiene mayor precisión que MFT, para todas las distancias epicentrales. Cuando el periodo es menor o igual a 15 s, la precisión de la transformada S es menor que MFT para distancias epicentrales de 1000 km y 8000 km (especialmente 8000 km). La precisión de estos dos métodos es similar para otras distancias epicentrales. En general, la transformada S es más precisa que MFT. Además, MFT depende predominantemente del valor del parámetro de filtro gaussiano a, pero la transformada S es autoadaptativa. Por lo tanto, la transformada S es un método más estable y preciso que MFT para la medición de la velocidad de grupo de las ondas sísmicas Rayleigh.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Earthquake Rayleigh waves]]></kwd>
<kwd lng="en"><![CDATA[group velocity]]></kwd>
<kwd lng="en"><![CDATA[S transform]]></kwd>
<kwd lng="en"><![CDATA[Multiple Filter Technique]]></kwd>
<kwd lng="es"><![CDATA[Ondas sísmicas Rayleigh]]></kwd>
<kwd lng="es"><![CDATA[velocidad de grupo]]></kwd>
<kwd lng="es"><![CDATA[transformada S]]></kwd>
<kwd lng="es"><![CDATA[Técnica de Filtrado Múltiple (MFT)]]></kwd>
</kwd-group>
</article-meta>
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