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Spectral Analysis in the Separation of Gravity Anomalies: Implications for Disaster Risk Reduction in the West Coast of Aceh
Análisis espectral en la separación de anomalías gravitatorias: implicaciones para la reducción del riesgo de desastres en la Costa Oeste de Aceh
DOI:
https://doi.org/10.15446/esrj.v29n4.116923Keywords:
Satellite Gravity Data, Disaster Risk Reduction, Spectral Analysis (en)datos de gravedad satelital, reducción del riesgo de desastres, análisis espectral (es)
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This study assesses the effectiveness of satellite gravity methods in disaster risk mapping for the West Coast of Aceh, focusing on fault detection through variations in rock density. The collected data were processed to determine the complete Bouguer anomaly, with terrain corrections using an assumed density of 2.67 g/cm³. Local anomaly values ranged from -32.2 mGal to 27.2 mGal, with higher values in the northeast and lower values in the southwestern coastal areas. Spectral analysis was employed to separate regional and residual anomalies, enhancing the identification of local faults and deeper tectonic features. Gradient analysis was used to delineate geological boundaries, which were validated using geological maps. Horizontal derivatives revealed strong correlations with fault structures, while vertical derivatives highlighted major fault boundaries but were less effective at detecting smaller-scale features. The findings are expected to contribute to disaster risk reduction efforts and support sustainable development planning in West Coast of Aceh. Additionally, these results offer valuable insights for future research and decision-making in disaster mitigation.
Este estudio evalúa la eficacia de los métodos de gravimetría satelital en la cartografía de riesgo de desastres para la Costa Oeste de Aceh, centrándose en la detección de fallas a través de variaciones en la densidad de las rocas. Los datos recopilados se procesaron para determinar la anomalía de Bouguer completa, con correcciones topográficas utilizando una densidad asumida de 2,67 g/cm³. Los valores de anomalía local variaron entre -32,2 mGal y 27,2 mGal, con valores más altos en el noreste y más bajos en las zonas costeras del suroeste. Se empleó el análisis espectral para separar las anomalías regionales y residuales, lo que permitió mejorar la identificación de fallas locales y características tectónicas más profundas. El análisis de gradientes se utilizó para delimitar los límites geológicos, los cuales se validaron mediante mapas geológicos. Las derivadas horizontales revelaron fuertes correlaciones con las estructuras de fallas, mientras que las derivadas verticales pusieron de manifiesto los límites de fallas principales, aunque fueron menos eficaces para detectar características de menor escala. Se espera que los resultados contribuyan a los esfuerzos de reducción del riesgo de desastres y respalden la planificación del desarrollo sostenible en la Costa Oeste de Aceh. Además, estos hallazgos ofrecen información valiosa para futuras investigaciones y la toma de decisiones en mitigación de desastres.
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