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)
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Existen numerosos métodos para detectar el borde de la gravedad y la fuente de anomalía del campo magnético, 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.
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