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• W2004176003 abstract "5 �ServicioNacionaldeEstudiosTerritoriales,�AvenidaLasMercedes,�SanSalvador,�ElSalvador 6 �InstituteofNuclearResearch,�HungarianAcademyofSciences,�H-4001�Debrecen,�P.O.�Box�51,�Hungary * �Correspondingauthor We have carried out geological studies including mapping at the scale 1 : 50 000 in the southern part of the San Salvador Metropolitan Area to support urban planning and natural hazard mitigation. The study area extends over the Cordillera del Balsamo, marginal fault system and southern part of the Central Graben between the active San Salvador volcano and Ilo- pango caldera. It represents a segment in the Central American Volcanic Front. Volcanic rocks of the Late Miocene to recent age, classified as the Balsamo, Cuscatlan and San Salvador formations, occur in the area. Remnants of two large basaltic andesite to andesite stratovolcanoes, Panchimalco and Jayaque, represent the BalsamoFormation. They show periclinal dips and facies zoning from lava flows and coarse epiclastic volcanic breccias of the proximal zone through epiclastic volcanic breccias/conglomerates of the medial zone to epiclastic volcanic conglomerates and sandstones of the distal zone. Their ages are 7.2-6.1 Ma and 2.6-1.5 Ma respectively. The CuscatlanFormation comprises the Jayaque and Santo Tomas calderas, the andesitic-dacitic Ilopango and Jayaque ignimbrites (1.9-1.4 Ma) in the SW and SE parts of the area, the Ilopango andesitic volcano (1.5-0.8 Ma), the Loma Larga basaltic volcano (0.8-0.5 Ma), the Planes de Renderos caldera, the dacite-andesite San Jacinto extrusive domes and effusive cone (0.4-0.25 Ma), the San Jose tuff/scoria cone, the Ilopango caldera extrusive domes (0.25-0.05 Ma), the Antiguo Cuscatlan scoria cone (0.2-0.08 Ma) and older tephra deposits of the Coatepeque and Ilopango calderas exposed along marginal faults of the Central Graben. The SanSalvadorFormation occurs as tephra cover along the crest of the Cordillera del Balsamo where it rests on laterites atop the Balsamo Formation and in the Central Graben. Tephra units belong to the Coatepeque caldera (Arce and Congo), San Salvador volcano (Apopa, G1 and G2) and Ilopango caldera (Tierra Blanca 1-4) spanning 70-1 ka. Tephra units are separated by palaeosols and aeolian dusty deposits. Las amenazas naturales afectan al territorio de El Salvador en toda su extension de manera constante. Se ha llevado a cabo un mapeo geologico en la parte Sur del Area Metropolitana de San Salvador (AMSS), asimismo se han evaluado las amenazas naturales potenciales que pueden afectar a la zona. El area de estudio se extiende sobre la Cordillera del Balsa-" @default.
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• W2004176003 date "2012-07-15" @default.
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• W2004176003 title "Geology and volcanic evolution in the southern part of the San Salvador Metropolitan Area" @default.
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• W2004176003 doi "https://doi.org/10.3190/jgeosci.088" @default.
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