%0 Journal Article
%T Volcanic eruptions with little warning: the case of Volc芍n Reventador's Surprise November 3, 2002 Eruption, Ecuador
%A Minard Hall
%A Patricio Ram車n
%A Patricia Mothes
%A Jean Luc LePennec
%J Revista geol車gica de Chile
%D 2004
%I Scientific Electronic Library Online
%X Successful mitigation of a possible volcanic disaster depends upon the early detection of renewed volcanic activity. With considerable optimism, volcano observatories instrument dangerous volcanoes, with the hope of an early recognition of the reactivation of a volcano. Reventador volcano's November 3, 2002 eruption came with little warning and had a tremendous socio-economic impact. Reventador volcano, a young andesitic cone in the Eastern Cordillera of Ecuador, has had, at least, 16 eruptions between 1541 and 2002. These eruptions were characterized by small pyroclastic flows, blocky lava flows, debris flows, and limited ash falls. With the exception of a M=4 earthquake near the volcano one month earlier, only seismic activity related to the eruption onset was registered. Following only 7 hours of seismic tremor, the paroxysmal eruption began at 0912 h on November 3, 2002 with a sustained column that ascended to 17 km and five pyroclastic flows, that traveled as much as 9 km to the east. By mid-afternoon ash falls of 1-10 mm thickness began blanketing the Interandean Valley near Quito. The economic impact was significant, including severe damage to the principal petroleum pipelines, closure of schools, businesses, and Quito's airport for 10 days. It is important to conclude that for those volcanoes that are characterized by low silica, volatile-rich, fluid magmas, magma ascent can be aseismic, rapid, and without much warning. This event should serve as a clear reminder to scientists, civil defense, and authorities of the rapid onset of the eruptions of some volcanoes Erupciones volc芍nicas con poco aviso: el caso de la erupci車n sorpresiva del 3 de Noviembre del 2002 del Volc芍n Reventador. La mitigaci車n exitosa de un posible desastre volc芍nico depende de la detecci車n oportuna de la reactivaci車n de un volc芍n. Con mucho optimismo, los observatorios volc芍nicos efect迆an un monitoreo de volcanes peligrosos, en espera de reconocer tempranamente el inicio de nueva actividad. La erupci車n del volc芍n Reventador, el d赤a 3 de Noviembre de 2002, comenz車 con poco aviso. El volc芍n Reventador es un volc芍n joven andes赤tico de la Cordillera Oriental del Ecuador que ha tenido, al menos, 16 erupciones desde 1541. Dichas erupciones fueron caracterizadas por flujos pirocl芍sticos y l芍vicos, flujos de escombros y ca赤da limitada de ceniza. Con la excepci車n de un fuerte sismo cerca del volc芍n un mes antes, se registr車 solamente la sismicidad que comenz車 el proceso eruptivo. Luego de 7 horas de 'tremor' s赤smico, la erupci車n paroxismal empez車 a las 0912 h de ese d赤a con una column
%K Volc芍n Reventador
%K Ecuador
%K Erupci車n con poco aviso
%K Reventador volcano
%K Ecuador
%K Eruption with little warning
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