<?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>S0016-71692017000200173</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Guadalajara, Mexico, Earthquake Sequence of December 2015 and May 2016: Source, Q, and Ground Motions]]></article-title>
</title-group>
<contrib-group>
<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[Arroyo]]></surname>
<given-names><![CDATA[Danny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Campos]]></surname>
<given-names><![CDATA[Xyoli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iglesias]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espíndola]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Citlalli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>173</fpage>
<lpage>186</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692017000200173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692017000200173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692017000200173&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We analize an earthquake sequence which occurred 24 km NNW from Guadalajara Cathedral. The activity began on 15 December, 2015 with an Mw4.1 earthquake and resumed, again, on 11 May, 2016 when the largest earthquake of the sequence, Mw4.8, occurred. The earthquakes were recorded in the city by two accelerographs and at larger distances by broadband seismographs. The source region of the sequence is located in the north of the broad junction formed by NW-SE trending Tepic-Zacoalco rift, N-S trending Colima rift, and E-W trending Chapala rift. The focal mechanism of the largest event is characterized by: strike &#966; = 21º, dip &#948; = 49º, and rake &#955; = -86º, with horizontal tensional axis trending 110º. This mechanism is not consistent with NE-SW direction of motion measured on fault strike by Barrier et al. (1990) ~ 35 km WNW of Guadalajara. It also differs from the mechanism reported in a previous study for a seismic sequence in the Zacoalco rift about 60 km south of Guadalajara. Similarities among recorded waveforms at the accelerographic stations suggest that the mechanism of other events in the sequence were similar and the events were located in a small volume, probably 1 to 2 km in radius. From the analysis of the recordings of the 11 May shock along the Trans-Mexican Volcanic Belt, from Ceboruco volcano to the west and Popocatepetl volcano to the east, the attenuation parameter Q as 141&#402; 0.63 was estimated. The earthquake on 11 May was felt very strongly in the city and produced peak ground acceleration (PGA) reaching 80 cm/s2. Relatively large earthquakes have been reported in the region; e.g., on 11 February, 1875 near the town of San Cristobal de la Barranca, about 40 km NNW of Guadalajara, therefore, the interest on using recordings from accelerographic stations to estimate peak ground motion parameters for scenario earthquakes of Mw &#8804; 6.0 using random vibration theory (RVT) and empirical Green&#8217;s function (EGF) techniques. From RVT simulations, the expected PGA, peak ground velocity (PGV), and peak ground displacement (PGD) at the accelerographic stations from an Mw6.0 earthquake in the source region of the sequence are 195 cm/s2, 10 cm/s, and 3 cm, respectively. The predictions from the EGF technique are somewhat higher but still within a factor of two of the RVT predictions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se analizó una secuencia de sismos que se produjo a 24 km NNW de la catedral de Guadalajara. La actividad inició el 15 de diciembre de 2015, con un sismo de Mw4.1 y se reanudó el 11 de mayo de 2016, cuando ocurrió el sismo más grande de la secuencia, Mw4.8. Los sismos fueron registrados por dos acelerógrafos en la ciudad y por estaciones de banda ancha a distancias mayores. La región de la fuente de la secuencia se encuentra en el norte de la amplia unión formada por los rifts Tepic-Zacoalco, con una orientación NW-SE, el de Colima, con una tendencia N-S, y el de Chapala, con tendencia E-W. El mecanismo focal del evento más grande se caracteriza por: rumbo &#966; = 21º, echado &#948; = 49º, y deslizamiento &#955; = -86º, con el eje de tensión horizontal en una dirección 110º. Este mecanismo no es consistente con la dirección NE-SW de movimiento medido en un echado de falla por Barrier et al. (1990) ~ 35 km al WNW de Guadalajara. También se diferencia del mecanismo reportado en un estudio previo para una secuencia sísmica en el rift de Zacoalco unos 60 km al sur de Guadalajara. La similitud de las formas de onda en las estaciones acelerográficas sugiere que el mecanismo de otros eventos en la secuencia fueron similares y los eventos se localizan en un volumen pequeño, probablemente en un radio de 1 a 2 km. A partir del análisis de registros del sismo del 11 de mayo a lo largo de la Faja Volcánica Trans Mexicana, desde el volcán Ceboruco, hacia el oeste, y hasta el volcán Popocatépetl, al este, se estimó el parámetro de atenuación Q como 141&#402; 0.63. El sismo del 11 de mayo se sintió fuertemente en la ciudad y produjo una aceleración máxima del terreno (PGA) que alcanzó 80 cm/s2. En la región se han reportado sismos relativamente grandes; e.g., 11 de febrero de 1875 en San Cristóbal de la Barranca, por lo cual resulta de interés emplear los registros de las estaciones acelerográficas para estimar los parámetros pico del movimiento del terreno debidos a escenarios sísmicos con Mw &#8804; 6.0 utilizando la teoría de vibraciones aleatorias (RVT) y las técnicas de la función de Green empírica (EGF). A partir de simulaciones empleando RVT, los valores de PGA esperada, velocidad pico (PGV) y desplazamiento pico (PGD) del movimiento del terreno en las estaciones acelerográficas para un sismo Mw6.0 en la región de la fuente de la secuencia son 195 cm/s2, 10 cm/s y 3 cm, respectivamente. Las estimaciones obtenidas a partir de la técnica de EGF son más altas que las calculadas con RVT en un factor de no mayor de dos.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[secuencia de sismos de Guadalajara]]></kwd>
<kwd lng="es"><![CDATA[valores pico de movimiento del terreno]]></kwd>
<kwd lng="es"><![CDATA[peligro sísmico en Guadalajara]]></kwd>
<kwd lng="en"><![CDATA[Guadalajara earthquake sequence]]></kwd>
<kwd lng="en"><![CDATA[peak ground motion]]></kwd>
<kwd lng="en"><![CDATA[Seismic hazard in Guadalajara]]></kwd>
</kwd-group>
</article-meta>
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