Examinando por Autor "Ruiz-Armenteros, Antonio Miguel"
Mostrando 1 - 9 de 9
- Resultados por página
- Opciones de ordenación
Ítem Active Shortening Simultaneous to Normal Faulting Based on GNSS, Geophysical, and Geological Data: The Seismogenic Ventas de Zafarraya Fault (Betic Cordillera, Southern Spain)(Willey, 2024) Madarieta-Txurruka, Asier; González-Castillo, Lourdes; Peláez, José Antonio; Galindo, Jesús; Borque, María Jesús; de-Lacy, Maria Clara; Ruiz-Armenteros, Antonio Miguel; Henares, Jesús; Ruano, Patricia; Sánchez-Alzola, Alberto; Avilés-Moreno, Manuel; Rodríguez-Caderot, Gracia; Martínez-Moreno, Francisco José; Tendero-Salmerón, Víctor; Vinardell-Peña, Raquel; Gil-Cruz, Antonio JoséThe central Betic Cordillera, southern Spain, is affected by an uplift related to the NNW–SSE Eurasia-Nubia convergence and shallow ENE–WSW orthogonal extension accommodated by the extensional system of the Granada Basin. The combination of geophysical, geodetic, and geological data reveals that the southwestern boundary of this extensional system is a seismically active compressional front extending from the W to the SW of the Granada Basin. The near-field Global Navigation Satellite System data determine NNE–SSW shortening of up to 2 mm/yr of the compressional front in the Zafarraya Polje. In this setting, the normal Ventas de Zafarraya Fault developed as a result of the bending-moment extension of the Sierra de Alhama antiform and was last reactivated during the 1884 Andalusian earthquake (Mw 6.5). The uplift in the central Betic Cordillera together with the subsidence in the Western Alborán Basin may facilitate a westward to southwestward gravitational collapse through the extensional detachment of the Granada Basin. The heterogeneous crust of the Betic Cordillera would generate the compressional front, which is divided into two sectors: thrusting to the west, and folding associated with buttressing to the south. Our results evidence that basal detachments, linking extensional fault activity with compressional fronts, may determine the activity of local surface structures and the geological hazard in densely populated regions.Ítem Assessment of k-Nearest Neighbor and Random Forest Classifiers for Mapping Forest Fire Areas in Central Portugal Using Landsat-8, Sentinel-2, and Terra Imagery(MDPI, 2021) da Penha Pacheco, Admilson; da Silva Junior, Juarez Antonio; Ruiz-Armenteros, Antonio Miguel; Faria Henriques, Renato FilipeÍtem Empowering intermediate cities: cost-effective heritage preservation through satellite remote sensing and deep learning(Taylor & Francis, 2024) Rodríguez-Antuñano, Ignacio; Sousa, Joaquim João; Bakoň, Matus; Ruiz-Armenteros, Antonio Miguel; Martínez-Sánchez, Joaquín; Riveiro, BelénIn the capitalist rush to attract more visitors, cities are committing significant resources to heritage conservation, driven by the substantial economic benefits generated by the tourism industry. However, less famous or less well-resourced cities, often with smaller populations, also known as intermediary cities, find it difficult to allocate funds to protect their most significant heritage sites. In this conservation context, intermediary cities, often on the periphery or ‘at the margins’, can fill the gaps and needs of urbanism through a better strategic understanding of the challenges of global touristification, thus this research provides urban planning tools for local governments with limited resources to preserve their architectural heritage through remote sensing, for its advantages in terms of lower economic cost, as a valuable monitoring tool to effectively identify high-vulnerability sites that require priority attention in the conservation of architectural heritage. In other words, it allows for a reduction in the territory of those areas located ‘at the margins’ in terms of urban planning and management, by approaching the territorial, urban, architectural and tourism problems from a transdisciplinary perspective in the preservation of the architectural heritage. This study explores the application of optical (Sentinel-2) using neural networks for classifying the land cover and radar (Sentinel-1 and PAZ) satellite images to obtain the ground motion as a geotechnical risk study, together with geospatial data, for the monitoring of architectural heritage in intermediate cities. Focusing on the districts of Bragança and Guarda in Portugal, the approach allows the direct identification of vulnerable architectural heritage, identifying 9 highly-vulnerable areas using PAZ data and 7 areas using Sentinel-1 data. Furthermore, this work provides an understanding of the potential and limitations of these technologies in heritage preservation because compares the processing results of freely accessible medium-resolution Sentinel-1 radar imagery with the high-resolution radar images from the innovative PAZ satellite.Ítem High- and Low-Angle Normal Fault Activity in a Collisional Orogen: The Northeastern Granada Basin (Betic Cordillera)(Willey, 2021) Madarieta-Txurruka, Asier; Galindo, Jesús; González-Castillo, Lourdes; Peláez, José Antonio; Ruiz-Armenteros, Antonio Miguel; Henares, Jesús; Garrido-Carretero, María Selmira; Avilés-Moreno, Manuel; Gil-Cruz, Antonio JoséUnderstanding active tectonics and seismicity in extensional settings requires the analysis of high-angle normal faults (HANFs) and the transfer of deformation at depth. The debate surrounds the role of low-angle normal faults (LANFs) in triggering high magnitude earthquakes. The central Betic Cordillera is an active seismic zone affected by the NNW-SSE Eurasia-Nubia convergence and orthogonal extension. The seismicity and present-day stress determined by earthquake focal mechanisms reveals the activity of a NE-SW extensional system in the shallowest 12 km of the Granada Basin. The structure of the sedimentary infill, as derived by geological field and gravimetric techniques, suggests the formation of a half-graben tilted to the N-NE. Seismologic data suggest the activity of HANFs above 6–7 km depth and a LANF zone around 6–12 km depth, with related earthquakes of up to Mw 4.0 and 20° to 30° fault dips. High-precision leveling lines highlight the importance of the Granada Fault in the system, with average vertical displacement rates of 0.35–1.1 mm/yr. These data suggest creep fault behavior at the surface and increased seismicity at depth. The upper crustal extension in the collisional Betic Cordillera is accommodated by a top-to-the-WSW extensional detachment related to westward motion and rollback in the Gibraltar Arc and the gravitational collapse of the cordillera, in a framework of NNW-SSE shortening. This comprehensive study draws a new scenario that advances understanding of relationships between HANFs and LANFs.Ítem Land Cover Transformations in Mining-Influenced Areas Using PlanetScope Imagery, Spectral Indices, and Machine Learning: A Case Study in the Hinterlands de Pernambuco, Brazil(MDPI, 2025-02-06) da Penha Pacheco, Admilson; Silva do Nascimento, João Alexandre; Ruiz-Armenteros, Antonio Miguel; da Silva Junior, Ubiratan Joaquim; da Silva Junior, Juarez Antonio; Maciel de Oliveira, Leidjane Maria; Melo dos Santos, Sylvana; Dacal Reis Filho, Fernando; Pessoa Mello Galdino, Carlos AlbertoÍtem Low-cost GNSS receiver in RTK positioning under the standard ISO-17123-8: A feasible option in geomatics(Elsevier, 2019) Garrido-Carretero, María Selmira; de-Lacy, María Clara; Borque, María Jesús; Ruiz-Armenteros, Antonio Miguel; Moreno-Guerrero, Rubén; Gil-Cruz, Antonio JoséGNSS positioning is nowadays applied for surveying and other geomatic applications. Although dualfrequency GNSS receivers are widely used, low-cost single-frequency receivers have been relegated to navigation applications. However, their advantages make them optimum candidates for positioning applications in many scientific areas. To know the precision limits of these measuring systems, the evaluation of the uncertainty of measurement results obtained by them is required. For that, it is recommended to apply standard operating procedures (SOP). The International Organization for Standardization (ISO) published the standard ISO 17123-8 aimed at specifying field procedures to be adopted when determining and evaluating the precision of GNSS field measuring systems in real-time kinematic (RTK). Using this standard, we evaluate the positioning performance of two GNSS receivers, the geodetic dual-frequency Leica GS10 with AS10 antenna using a network RTK solution, and the low-cost single-frequency u-blox NEO-M8P using a single-base RTK solution. Considering the different sources of uncertainty and their influence quantities, the combined uncertainty budget for the dualfrequency receiver gives combined standard uncertainties on the horizontal position at the order of ±2.5 mm and close to ±4.5 mm for the vertical coordinate. In the case of the low-cost receiver, the combined standard uncertainties are close to ±5.5 mm for the horizontal position and ±11 mm for heights. The results indicate that just as the geodetic receiver satisfies the horizontal and vertical subcentimetric precision limits established for high precision applications, the low-cost receiver can achieve a competitive positioning performance to survey-grade receivers in real-time positioning for short baselines.Ítem MT-InSAR and Dam Modeling for the Comprehensive Monitoring of an Earth-Fill Dam: The Case of the Benínar Dam (Almería, Spain)(MDPI, 2023) Marchamalo-Sacristán, Miguel; Ruiz-Armenteros, Antonio Miguel; Lamas, Francisco; González-Rodrigo, Beatriz; Martínez-Marín, Rubén; Delgado-Blasco, José Manuel; Bakoň, Matus; Lazecky, Milan; Perissin, Daniele; Papco, Juraj; Sousa, Joaquim JoãoThe Benínar Dam, located in Southeastern Spain, is an earth-fill dam that has experienced filtration issues since its construction in 1985. Despite the installation of various monitoring systems, the data collected are sparse and inadequate for the dam’s lifetime. The present research integrates Multi-Temporal Interferometric Synthetic Aperture Radar (MT-InSAR) and dam modeling to validate the monitoring of this dam, opening the way to enhanced integrated monitoring systems. MT-InSAR was proved to be a reliable and continuous monitoring system for dam deformation, surpassing previously installed systems in terms of precision. MT InSAR allowed the almost-continuous monitoring of this dam since 1992, combining ERS, Envisat, and Sentinel-1A/B data. Line-of-sight (LOS) velocities of settlement in the crest of the dam evolved from maximums of −6 mm/year (1992–2000), −4 mm/year (2002–2010), and −2 mm/year (2015–2021) with median values of −2.6 and −3.0 mm/year in the first periods (ERS and Envisat) and −1.3 mm/year in the Sentinel 1-A/B period. These results are consistent with the maximum admissible modeled deformation from construction, confirming that settlement was more intense in the dam’s early stages and decreased over time. MT-InSAR was also used to integrate the monitoring of the dam basin, including critical slopes, quarries, and infrastructures, such as roads, tracks, and spillways. This study allows us to conclude that MT-InSAR and dam modeling are important elements for the integrated monitoring systems of embankment dams. This conclusion supports the complete integration of MT-InSAR and 3D modeling into the monitoring systems of embankment dams, as they are a key complement to traditional geotechnical monitoring and can overcome the main limitations of topographical monitoring.Ítem Risk Evaluation of the Sanalona Earthfill Dam Located in Mexico Using Satellite Geodesy Monitoring and Numerical Modeling(MDPI, 2023) Vázquez-Ontiveros, J. René; Ruiz-Armenteros, Antonio Miguel; de-Lacy, Maria Clara; Gaxiola-Camacho, José Ramon; Anaya-Díaz, Miguel; Vázquez-Becerra, EstebanDams are essential structures in the growth of a region due to their ability to store large amounts of water and manage it for different social activities, mainly for human consumption. The study of the structural behavior of dams during their useful life is a fundamental factor for their safety. In terms of structural monitoring, classic terrestrial techniques are usually costly and require much time. Interferometric synthetic aperture radar (InSAR) technology through the persistent scatterer interferometry (PSI) technique has been widely applied to measure millimeter displacements of a dam crest. In this context, this paper presents an investigation about the structural monitoring of the crest of the Sanalona dam in Mexico, applying two geodetic satellite techniques and mathematical modeling to extract the risk of the dam–reservoir system. The applicability of the InSAR technique for monitoring radial displacements in dams is evaluated and compared with both GPS systems and an analytical model based on the finite element method (FEM). The radial displacements of the Sanalona dam follow a seasonal pattern derived from the reservoir level, reaching maximum radial magnitudes close to 13 mm in November when the rainy season ends. GPS recorded and FEM simulated maximum displacements of 7.3 and 6.7 mm, respectively. InSAR derived radial displacements, and the reservoir water level presented a high similarity with a correlation index equal to 0.8. In addition, it was found that the Sanalona dam presents the greatest deformation in the central zone of the crest. On the other hand, based on the reliability analysis, the probability of failure values lower than 8.3 × 10−2 was obtained when the reservoir level was maximum, which means that the radial displacements did not exceed the limit states of the dam–reservoir system in the evaluated period. Finally, the extracted values of the probability of failure demonstrated that the Sanalona dam does not represent a considerable risk to society.Ítem Study of Recent Deformations in the Bogotá Savanna and the City of Bogotá (Colombia) Using Multi-Temporal Satellite Radar Interferometry(MDPI, 2023) Tamayo, Juan; Ruiz-Armenteros, Antonio Miguel; Ávila-Álvarez, Guillermo; Matiz, Gustavo; Sousa, Joaquim JoãoBogotá, the largest urban center and capital city of Colombia, is located within the Bogotá savanna, which originated as a lake in the central part of the Colombian Eastern Cordillera. Over time, the lake transformed into a gently undulating plain with horizontally deposited sediments that formed around five million years ago. Over the last few decades, the region has undergone significant population growth and rapid urban development, largely driven by migration from rural areas. This development has substantially impacted the subsidence observed in the city, primarily due to the extraction of groundwater. A previous study by the Servicio Geológico Colombiano (SGC) utilized data from GNSS stations and synthetic aperture radar interferometry (InSAR) with TerraSAR-X SAR between 2011 and 2017 to identify a subsidence pattern in the central region of Bogotá. The purpose of the study was to evaluate the risks and potential disasters associated with the subsidence phenomenon. Our study investigates both the subsidence in Bogotá, previously studied, as well as the rural savanna area, which is currently undergoing significant residential and industrial development. We utilized multi-temporal InSAR (MT-InSAR) techniques with Sentinel-1 SAR images from 2014 to 2021. The analysis results indicate that the outer regions of the city display the most significant subsidence, extending from the center to the north. The subsidence velocities in these areas reach approximately 5–6 cm/year.