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Earth Sciences History, 2009
International Journal of Earth Sciences, 2003
Progress in Physical Geography, 2021
Thomas Sutcliffe, ex gobernador británico, informó de una erupción submarina en la bahía Cumberland, isla Robinson Crusoe, poco después del terremoto que sacudió la costa de Chile el 20 de febrero de 1835. Este episodio fue descrito por Charles Darwin en su Viaje del Beagley desde entonces se ha hecho una amplia mención, especialmente estimulada por una reconocida pintura de JM Rugendas. Debido a la aparente relación causal, este evento también se ha citado ampliamente como un ejemplo de erupción tectónicamente desencadenada a distancia. Sin embargo, existen inconsistencias que plantean dudas sobre la ocurrencia real de una erupción. Aquí presentamos evidencia en contra de la hipotética erupción basada tanto en la ausencia de evidencia geológica como en una reinterpretación de los relatos históricos. Primero observamos que no hay ninguna anomalía batimétrica inmediatamente debajo del lugar de la 'columna eruptiva' representada. También notamos la ausencia de cualquier depósito o morfología volcánica reciente y luego desentrañamos alguna incompatibilidad entre los parámetros vulcanológicos esperados y la columna destacada. Además, analizamos los registros históricos y concluimos que son compatibles con un tsunami que ingresa a la bahía. Por medio de simulaciones numéricas demostramos además que las cuentas coinciden bien con el comportamiento esperado de un tsunami provocado por un terremoto distante. Inferimos que algunos procesos relacionados con los tsunamis (ondas sonoras, desprendimientos de rocas, rayos) pueden haberse malinterpretado en ese momento. Este último corresponde al conocimiento actual de los procesos naturales, pero también podría haber sido ampliado deliberadamente en el informe de Sutcliffe. Nuestro enfoque multidisciplinario proporciona evidencia geográfica completa y consistente de un hecho que no sucedió. Este hallazgo es relevante desde la perspectiva de la amenaza, pero también para la ciencia de los terremotos y erupciones, o el conocimiento de los procesos que controlan el vulcanismo secundario tardío en islas oceánicas y montes submarinos.
International Journal of Earth Sciences
The Galápagos islands are an archipelago of volcanic islands, created by a hot spot, some 1000km off the coast of Ecuador. Initial explorations of Besson (Besson et al. 1982) and also investigations led by the Museo de Ciencias Naturales (led by J. J. Hernandez), suggested that a systematic effort to document the caves of Gálapagos was warranted. In 2006, Addison, Osburn and Toulkeridis conducted a successful reconnaissance trip to assess the potential for caves. Starting in 2010 yearly expeditions began to located and document the lava tubes and magma chambers of Galapagos. These data are being used as a solid foundation for scientific investigation on these largely unknown enviornments. Efforts to date include the discovery and survey of Triple Volcán, the deepest known cave (conduit) in the islands at -101m and documentation of numerous giant tortoise sites within lava tubes. Intial measurements of gas emissions in caves indicate an enormous natural rate of important greenhouse g...
Annals of Geophysics, 2019
Archaeological and historical studies, conducted since 1950, allow us to trace a hypothetical demographic framework in which three crises extended over time, attributed by scholars to unfavourable social-economic situations or to war aggression, can be observed. A comparison of these three crises with the volcanological record reveals a correlation suggesting that the volcanic events had an effect on local anthropic history.
Guide del Museo Archeologico regionale "L. Bernabò Brea", 2015
Contributions To Mineralogy and Petrology, 1998
Roca Redonda volcano is a mostly submarine shield volcano that rises nearly 3 km from the adjacent seafloor. Over twenty lava flows and palagonite tuff are exposed in a 60 meter high oblong outcrop above sea level, and several other flows are exposed in the shallow water surrounding the islet. Thick, slightly alkaline picritic flows form the base of the section. Thinner picrites interbedded with sparsely porphyritic alkali-olivine basaltic pahoehoe toes characterize the upper section. The subaerial section probably records the filling of a palagonite tuff cone with younger lavas. Numerous fumaroles that may have a magmatic component are present in the shallow (<30 m) submarine zone and indicate that the volcano is probably still active. Three lava types are exposed: the basal picrites with 19% > MgO > 14%, high-Mg basalts with MgO of about 9%, and low-Mg basalts with MgO of about 6%. The Sr and Nd isotopic ratios of the three lava types are within analytical uncertainty. Olivine compositions indicate that the picrites are basaltic liquids that have accumulated olivine whose composition is in equilibrium with the host basaltic liquid. Apparently, basaltic magmas percolated through dunite and troctolite that had crystallized from slightly older Roca Redonda basaltic magma. Lavas from Roca Redonda have enriched trace element contents and isotopic ratios relative to nearby Wolf volcano, but they are quite similar to lavas from Cerro Azul and Ecuador volcanoes. The common characteristic of these volcanoes is that they lie on the periphery of the archipelago and are in a stage of subaerial growth. This suggests that Galápagos volcanoes may go through a juvenile alkaline stage before a mature tholeiitic stage, analogous to the Loihi stage of Hawaiian volcanism. A low 3He/4He ratio in olivine from one of the picrites indicates a small contribution by the Galápagos mantle plume.
Mental Health Impacts of COVID-19 on Teachers, 2024
Linguistic Diversity in Azerbaijan: Present State and Future Challenges, 2023
The American Benedictine review, 2011
SLOVENSKÁ ARCHEOLÓGIA, 2020
Documentos de Arqueología Medieval 13, 2019
Scientific reports, 2014
My Experience of Precision Engineering, 2022
Journal of Applied Pharmaceutical Science, 2016
Frontiers in psychology, 2018
Lithuanian Mathematical Journal, 2019