<?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>S0016-71692025000201543</article-id>
<article-id pub-id-type="doi">10.22201/igeof.2954436xe.2025.64.2.1790</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Determination of Anomaly Source Border Using Reweighting Focusing Inversion of Two-Dimensional Gravity Horizontal Gradient Data and Conventional Edge Detection Methods (Case Study: A Chromite Mass in Sabzevar, Iran)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kabiri]]></surname>
<given-names><![CDATA[Mahsa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Riazi Rad]]></surname>
<given-names><![CDATA[Zohreh Sadat]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Islamic Azad University Faculty of Geological Science and Civil Engineering Department of Geophysics]]></institution>
<addr-line><![CDATA[Tehran ]]></addr-line>
<country>Iran</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Islamic Azad University Faculty of Basic Science Department of Geology]]></institution>
<addr-line><![CDATA[Chaluos ]]></addr-line>
<country>Iran</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>64</volume>
<numero>2</numero>
<fpage>1543</fpage>
<lpage>1561</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692025000201543&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692025000201543&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692025000201543&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract There are numerous methods to detect the edge of gravity and magnetic field anomaly source, most of which are based on the combination of first and second-order horizontal and vertical gradients of the potential field. Gradient-based and other edge detection methods determine the anomaly source borders on the ground surface. In the present study, a linear reweighting focusing inversion method has been used to detect the vertical edges of a subsurface mass using gravity horizontal gradient data. With simultaneous evaluation the results of the proposed method and the conventional edge detection methods, we can accurately detect the subsurface anomaly sources boundary. The efficiency of the linear reweighting focusing inversion method is applied for two sets of gravity horizontal gradient data, with and without noise, related to two synthetic models. The subsurface density contrasts distribution obtained from the analysis of the synthetic models by this inversion method has well determined the underground location of the farther edges of the anomaly source. This method is used to detect the underground edges of a chromite mass in Sabzevar. Also, to compare and validate the results, three conventional local phase filters namely the analytical signal, tilt angle, and total horizontal differential have been used to detect the anomaly source border. The results obtained from various methods show an acceptable conformity in chromite mass border detection. Based on the analysis conducted over real gravity data, the depth of the farthest subsurface vertical borders is between a range of 5 to 10 meters, and the highest horizontal expansion was around 26 meters.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Existen numerosos métodos para detectar el borde de la fuente de anomalías de campos gravimétricos y magnéticos, la mayoría de los cuales se basan en la combinación de gradientes horizontales y verticales de primer y segundo orden del campo potencial. Los métodos de detección de bordes basados en gradientes y otros métodos determinan los límites de la fuente de anomalías en la superficie del suelo. En el presente estudio, se utilizó un método de inversión de enfoque de reponderación lineal para detectar los bordes verticales de una masa subterránea. La ventaja de este método sobre los métodos convencionales es que mediante el uso de datos de gradiente horizontal de gravedad en el método de inversión de enfoque de reponderación, podemos detectar las fuentes de anomalías del subsuelo. La eficiencia del método de inversión de enfoque de reponderación lineal para dos conjuntos de datos de gradiente horizontal de gravedad se evaluó en dos modelos sintéticos (ruidoso y silencioso). La distribución de densidad del subsuelo obtenida del análisis de los modelos sintéticos mediante este método de inversión estimó bien la ubicación subterránea de los bordes más lejanos de la fuente de la anomalía. Este método se utiliza para detectar los bordes subterráneos de una masa de cromita en Sabzevar. Además, para comparar y validar los resultados, se utilizaron tres filtros de fase locales convencionales, a saber, la señal analítica, el ángulo de inclinación y el diferencial horizontal total, para detectar el borde de la fuente de anomalía. Los resultados obtenidos de varios métodos muestran una conformidad aceptable en la detección de bordes de masa de cromita. Según el análisis realizado, la profundidad de los bordes verticales del subsuelo más lejanos osciló entre 5 y 10 metros, y la expansión horizontal más alta fue de alrededor de 26 metros.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chromite]]></kwd>
<kwd lng="en"><![CDATA[gravity horizontal gradient]]></kwd>
<kwd lng="en"><![CDATA[linear reweighting focusing inversion]]></kwd>
<kwd lng="es"><![CDATA[cromita]]></kwd>
<kwd lng="es"><![CDATA[gradiente horizontal de gravedad]]></kwd>
<kwd lng="es"><![CDATA[inversión de enfoque de reponderación lineal]]></kwd>
</kwd-group>
</article-meta>
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