GEO 108 Lecture 3: CGEO - class notes - 18-May-2015 (1)

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Notes from movie re: pinatubo volcano eruption in the philippines (the largest eruption in the world in the past 18 years): Movie available on youtube: nova in the path of a killer volcano (1992) Predict time, size and direction of eruption. So2 & co2 discharge from molten material inside the mountain (measured by correlation spectrometer or corspec) Level iii: eruption can occur within 2 weeks. Level iv: eruption will occur within 48 hours. In 1986, in columbia, nevado del ruiz erupted. Prior to that, scientists advised of no risk but the eruption occurred in the middle of the night, resulting in 22,000 death toll. In 1991, june 12 and june 15, pinatubo erupted with only 500 death toll. Roofs caved in due to the weight of the rain-soaked ash exceeding the load capacity (rain created by the micro-climate (characterized by lightning and heavy rain). The surrounding areas were covered by ashes, described as monochromatic landscape.

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