<?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>S0016-71692021000200140</article-id>
<article-id pub-id-type="doi">10.22201/igeof.00167169p.2021.60.2.2053</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Three-dimensional shear-wave quality factor, Qs(f), model for South-Central Gulf of California, Mexico obtained from inversion of broadband data]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[Sanjay]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Joshi]]></surname>
<given-names><![CDATA[Anand]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Raul R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[Shri K.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[Sandeep]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Indian Institute of Technology Roorkee Department of Earth Sciences ]]></institution>
<addr-line><![CDATA[Roorkee Uttarakhand]]></addr-line>
<country>India</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada División Ciencias de la Tierra Departamento de Sismología]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ México City]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>60</volume>
<numero>2</numero>
<fpage>140</fpage>
<lpage>159</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692021000200140&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692021000200140&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692021000200140&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We apply an iterative inversion scheme, initially developed by Hashida and Shimazaki (1984) and later modified by Joshi et al., (2010), to estimate three - dimensional shear - wave quality factor, Qs (f), of south-central Gulf of California, Mexico. An area of 230 km x 288 km in this region is divided into 108 rectangular blocks of different Qs (f). We use 25 well-located earthquakes recorded at three broadband stations of the regional network RESBAN operated by CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California) and three Ocean Bottom Seismographs (OBS) of the Sea of Cortez Ocean Bottom Array (SCOOBA) experiment. This dataset permits us to obtain Qs (f) estimates of different blocks using the modified inversion algorithm. Qs (f) is obtained at various frequencies in 0.16 ~8.0 Hz range. We found that the estimated Qs structure correlates with geological and tectonic models of the region proposed in previous studies. A regional frequency-dependent relation using all 1944 values of shear-wave quality factor is obtained at 18 different frequencies in all blocks can be approximated by a function of the form Qs (f) = 20 f1.2. This relation is typical in a tectonically active region with high S-wave attenuation and is similar to attenuation relations reported by other authors for the Imperial Valley, California region.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se aplicó un esquema de inversión iterativo, inicialmente desarrollado por Hashida y Shimazaki (1984) y posteriormente modificado por Joshi et al., (2010), para estimar el factor de calidad de onda corta tridimensional, Qs (f), del centro-sur del Golfo de California, México. Es un área de 230 x 288 km que se divide en 108 bloques rectangulares de diferentes Qs (f). Se utilizó 25 terremotos bien ubicados registrados en tres estaciones de banda ancha de la red regional RESBAN operada por CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California) y tres Sismógrafos de Fondo Oceánico (OBS, por sus siglas en inglés) de un conjunto del Experimento del Fondo Oceánico del Mar de Cortés (SCOOBA, por sus siglas en inglés). Este conjunto de datos permitió obtener estimaciones de Qs (f) de diferentes bloques, utilizando el algoritmo de inversión modificado. El Qs (f) se obtuvo a varias frecuencias en el rango de 0,16 ~ 8,0 Hz. Se encontró que la estructura Qs estimada se correlaciona con los modelos geológicos y tectónicos de la región propuestos en estudios previos. Se obtuvo una relación regional dependiente de la frecuencia que utiliza todos los valores de 1944 del factor de calidad de la onda de corte a 18 frecuencias diferentes en todos los bloques y se puede aproximar mediante una función de la forma Qs (f) = 20 f  1.2 . Esta relación es típica en una región tectónicamente activa con alta atenuación de onda S y es similar a las relaciones de atenuación reportadas por otros autores para la región del Valle Imperial, California.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Qs]]></kwd>
<kwd lng="es"><![CDATA[atenuación]]></kwd>
<kwd lng="es"><![CDATA[Golfo de California]]></kwd>
<kwd lng="es"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[inversión de onda corta]]></kwd>
<kwd lng="en"><![CDATA[Qs]]></kwd>
<kwd lng="en"><![CDATA[Attenuation]]></kwd>
<kwd lng="en"><![CDATA[Gulf of California]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[Shear-wave inversion]]></kwd>
</kwd-group>
</article-meta>
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