Repositorio Digital Sernageomin
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Resumen de estado de remoción en masa : Deslizamiento multirrotacional de suelo en la Calle Ancud N° 01674, Villa Turingia, Temuco, Región de La Araucanía 02-07-24
Full text linkMinuta ATG Flash La Araucanía 20244 p
Evaluación geológica de terreno para el emplazamiento del hospital de Castro, comuna de Castro, región de Los Lagos
No full textInforme Técnico -- Unidad Ejecutora: Dirección Regional Los Lagos12 p
Evaluación de peligro de remoción en masa en sector Pasaje Ferroviario de Villa Tijeral, comuna de Renaico, Región de La Araucanía
No full textInforme Técnico -- Unidad Ejecutora: Dirección Regional de Los Ríos, Valdivia26 p
Evaluación preliminar de peligro geológico en las localidades de Los Maitenes y El Alfalfal, comuna de San José de Maipo
No full textInforme Técnico -- Unidad Ejecutora: Unidad de Asistencias Técnicas y Emergencias Geológicas, Santiago18 p
Living in-between : Implications of local risk perceptions for the management of future eruptions at the Calbuco and Osorno volcanoes (Ensenada, Chile)
Full text linkSince the perceptions of communities at risk play a central role in managing future emergencies, contingency plans must consider the appropriate involvement of the perspectives of exposed populations. This article addresses the case of Ensenada (Puerto Varas, Chile), a settlement located in the area of direct influence of the Calbuco and Osorno volcanoes. They respectively rank 2nd and 8th in the list of highest-threat Chilean volcanoes. Here we depict the multiple risk perceptions of the inhabitants of Ensenada and the integration of human perceptions into volcanic emergency management through qualitative research, based on semi-structured interviews and documentary analysis. Our results illustrate that Ensenada represents a settlement critically exposed to multiple hazards from both volcanoes, intertwined with a series of social conditions that influence individuals’ self-perception as vulnerable to future eruptions and, simultaneously, as capable of acquiring conditions to strengthen disaster preparedness. Moreover, the locals are eager to participate in future emergency management planning and adopt preventive attitudes at community, household, and individual levels. Based on these results, we highlight the advantages of a better understanding of the causes of perceived risk and its integration into emergency management strategies for future eruptions, in order to visualise how people make sense of daily life and disaster preparedness in the midst of active volcanoes.pp.63-8
Evaluación de peligro de remoción en masa en estero Las Trancas, ruta T-55, comuna de Futrono, región de Los Ríos
No full textInforme Técnico -- Unidad Ejecutora: Unidad de Geología Regional, Dirección Regional de Los Ríos, Valdivia18 p
Evaluación de susceptibilidad de remoción en masa del área del complejo fronterizo Peulla, comuna de Puerto Varas, región de Los Lagos
No full textInforme Técnico -- Unidad Ejecutora: Dirección Regional Los Lagos15 p
LAURA VARAS RIVEROS (1944-2023) ¡Adiós Laurita, donde quiera que estés!
No full textLaura Varas, Laurita para los cercanos, falleció el día 20 de julio de 2023, a la edad de 79 años, después de una prolongada lucha que la tuvo muchas veces alejada de los microscopios petrográficos de Sernageomin. El sábado 22 la despedimos en el cementerio Parque del Recuerdo de Santiago, día en que abundantes gotas de lluvia se mezclaron con nuestras lágrimas. Era de esas personalidades que dejan huella: una transgresora de su época, rebelde, mujer alternativa, solidaria y cariñosa hasta la médula, siempre dispuesta a escuchar al otro y otra, ávida de aprender. Su sonrisa, muy característica, nos recibía en la Sala de Microscopía junto con galletas, frutos secos y alguna fruta de la estación. Sin duda su faceta antisistémica es la que la hizo más cercana y comprensiva con las generaciones más jóvenes, donde dejó una huella profunda. Varios de los que fueron estudiantes en práctica del Servicio “cayeron en sus manos”, donde no solo les compartió sus conocimientos al microscopio petrográfico y lupa binocular, sino que los y las encantaba, los que los convirtía en sus verdaderos fanslovers.pp.268-27
Geological mapping in the Argentine Frontal Cordillera (~30°30’ S) using ASTER images
Full text linkThe eastern flank of the Argentine Frontal Cordillera at ~30°30’ S is a remote area with rugged topography and high elevations that hinder geological field mapping. This task is also challenging because several outcrops are dominated by Permian-Triassic and Cenozoic volcanic rocks of intermediate to acid compositions with scarce geochronological age constraints. In this work, we use ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) data to clarify the structural and stratigraphic framework of the region. Visible and near infrared (VNIR) and shortwave infrared (SWIR) band combinations, integrated with field observations, are effective in identifying first-order geological features. In addition, the Semi-Automatic Classification Plugin (SCP; a free open-source plugin for QGIS) is capable of discriminating lithological units and is especially useful to visualize their distribution. Results presented here allow us to characterize Permian-Triassic and Cenozoic units, propose tentative correlations between the Permian-Triassic rocks, and outline major tectonic structures in the study area. This work demonstrates the capability of ASTER data to improve geological mapping, especially in those places where field work is difficult.pp.330-35
K-Ar geochronology of the western half of Tupungato volcano : The 1984 Hildreth-Drake-Fierstein expedition
No full textDuring 23 days in February 1984, the team made up by Wes Hildreth, Bob Drake, and Judy Fierstein explored and sampled much of the western half of the Tupungato volcano, a Chile-Argentina natural landmark at ~33.3° S, including its summit area. The project remained unfinished, and this impressive, ~6,550 m-high volcanic edifice was no longer the focus of significant studies. Forty years later, Wes Hildreth has given up and graciously handed over to us all his data, so it can now be shared with the geological community.Bob Drake dated six samples of Tupungato through the K-Ar technique. In a dacite dome from the southern summit, interpreted as the youngest Tupungato activity, a hornblende age of 831±116 ka is reported. A long-standing controversy is thus resolved: Tupungato has no Holocene activity. 1.26±0.6 Ma to 932±90 ka plagioclase ages are reported from three andesite lavas from the lower to middle flank of the volcano, constraining the age of the edifice to the Early Pleistocene. Finally, hornblendes from two pre-Tupungato dacitic deposits at the volcano’s western foothill were dated at 11.4±0.5 Ma and 9.45±0.6 Ma. These much older deposits may represent pyroclastic rich facies similar to the ones described in the upper sections of the Tunuyán Conglomerates, in Argentina.pp.538-54