Minor Case Studies 0.0 / 5 ? GeographyPlate tectonicsA2/A-levelAQA Created by: MeganCreated on: 29-05-15 15:46 Lake Nyos - Gas Eruption - 1986 An active crater lake formed from eruption 5 centuries ago Contain large amounts of CO2 dissolved at depth Possible explanation - Gradual heating from below the lake caused rollover and gas release Gas seeped out of lake and was invisible - killed all living things within a 25km radius - 1700 people Managed - electronic pump used in 2001 to degas the lake 1 of 6 Mount Ontake - September 2014 At least 36 people killed No signs of warning as there was no lava, only gas and ash Volanic debris settled within 4km of the peak 2 of 6 Nevado Del Ruiz - Lahar - 1985 Colombia 13th November 1985, eruptive activity had increased, causing melting of the ice cap 10pm - lahars ran down east slope over Chinchina, killing 1800 people 11pm - travelled westwards at 45km to Aermero, burying it in 8m of mud, killing 22 000 3 of 6 Iceland Volcano 2010/11 Caused major disruption - planes etc Ash plume over 1km high 4 of 6 Volcano Management 1973 Eldfell Eruption in Iceland - sea water sprayed to cool lava Mt Pinatubo - drained a lake to prevent lahars 5 of 6 Japan EQ Nov 2014 6.7 magnitude - pacific plate subducted under eurasian plate 39 people injured Damage to 450 buildings Blackouts affected 1600 homes Parts of damaged homes coverd with palstic to protect from predicted snowfall Emergency services rescued all 21 people who were trapped under collapsed buildings 6 of 6
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