<?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>S0016-71692019000300211</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Subsidence and Morphologic Variations in Mexico City Generated by the Earthquakes of September 2017]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lira]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nuñez]]></surname>
<given-names><![CDATA[Marisol]]></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[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Comisión Federal de Electricidad Departamento de Geomática ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>58</volume>
<numero>3</numero>
<fpage>211</fpage>
<lpage>227</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692019000300211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692019000300211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692019000300211&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Two earthquakes that occurred in southwest Mexico generated subsidence and morphologic changes in the area of Mexico City. To study the subsidence, an interferometric procedure was carried out using four interferometric pairs acquired from the radar satellite Sentinel-1 in IW (Interferometric Wide Swath) TOPS (Terrain Observation by Progressive Scan) SLC (Single Look Complex) mode. Four interferograms and four displacement maps were generated. To quantify the morphologic changes, a synergism of the Sentinel-1 radar bands in IW GRD (Ground Range Detected) mode and the SPOT 6/7 optical bands was considered. The synergism consists of a hybrid image formed by the radar bands and the optical bands. Principal component analysis was applied to the bands of the hybrid image. The first three components were retained, and a divergence operator was then applied to the vector field formed by these components, producing a texture map. The texture map was evaluated in conjunction with the interferogram and displacement map for the September 2017 earthquakes. Results indicated a complex pattern of subsidence and morphologic changes. The interferogram and subsidence of September 2017 correlated with a map of earthquake damages.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Dos terremotos ocurridos en el suroeste de México generaron hundimientos y cambios morfológicos en el área de la Ciudad de México. Para estudiar la subsidencia, se llevó a cabo un procedimiento interferométrico utilizando cuatro pares interferométricos adquiridos del radar del satélite Sentinel-1 en modo IW (Amplia Banda Interferométrica) TOPS (Observación del terreno mediante exploración progresiva) SLC (Complejo de aspecto simple). Se generaron cuatro interferogramas y cuatro mapas de desplazamiento. Para cuantificar los cambios morfológicos, se consideró un sinergismo de las bandas de radar Sentinel-1 en el modo IW GRD (Rango de Tierra Detectado) considerando las bandas ópticas SPOT 6/7. El sinergismo consiste en una imagen híbrida formada por las bandas de radar y las bandas ópticas. El análisis de componentes principales se aplicó a las bandas de la imagen híbrida. Los primeros tres componentes se retuvieron, y luego se aplicó un operador de divergencia al campo vectorial formado por estos componentes, produciendo un mapa de textura. El mapa de textura se evaluó junto con el interferograma y el mapa de desplazamiento para los terremotos de septiembre de 2017. Los resultados indicaron un patrón complejo de hundimientos y cambios morfológicos. El interferograma y la subsidencia de septiembre de 2017 se correlacionaron con un mapa de daños por terremotos.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[interferometría]]></kwd>
<kwd lng="es"><![CDATA[subsidencia]]></kwd>
<kwd lng="es"><![CDATA[sinergismo]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[interferometry]]></kwd>
<kwd lng="en"><![CDATA[subsidence]]></kwd>
<kwd lng="en"><![CDATA[synergism]]></kwd>
<kwd lng="en"><![CDATA[texture]]></kwd>
<kwd lng="en"><![CDATA[Mexico City]]></kwd>
</kwd-group>
</article-meta>
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