ca crater lake nyos 1986 cameroon west africa co2

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Unformatted text preview: example of Cascade volcanic erupPon Mount St. Helens Dormant for 120 yrs http://www.youtube.com/ watch?v=xP2dreOI8gI Summit -400 m p. 188 What is This Coming Down a Stratovolcano? a)  b)  c)  d)  An aa lava flow A pyroclastic flow A lahar A hot tephra avalanche e)  A river containing poisonous gas Lahars Mt. Pinatubo, Philippines, 1991 Nevada del Ruiz, Colombia, 1985 >28,000 dead, up to 50 m high mud §༊  §༊  §༊  Mudflows reach far beyond volcanic slopes Towns built on sites of earlier disasters (1595, 1845 forgo^en) 1985: report indicated high probability of mudflows, great danger for town of Armero (100 km downstream) and others – local officials dismissed report as ‘too alarming’ Poisonous Gases §༊  water vapor & CO2 (90%) §༊  §༊  §༊  §༊  CO SO2 – ‘gun powder’ à༎ H2SO4 H2S – ‘rotten eggs’ F2 §༊  Toxic concentr...
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