Nevada Del Ruiz Columbia 1985 (Predominant volcanic hazard: LAHAR) http://www.bbc.co.uk/education/clips/zgg76sg.

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Presentation transcript:

Nevada Del Ruiz Columbia 1985 (Predominant volcanic hazard: LAHAR) http://www.bbc.co.uk/education/clips/zgg76sg

Mt. Etna, Sicily 2002 (but ongoing activity Mt.Etna, Sicily 2002 (but ongoing activity..) (Predominant volcanic hazard- lava flows) https://www.youtube.com/watch?v=DazOdW6iqjE

Volcanic Hazards – Summary Diagram complete p.81

N.B A ‘Fumerole’ is an area of superheated water that turns to steam when it condenses on the surface

What is the difference between a primary and secondary volcanic hazard? PRIMARY HAZARDS : occur initially as a direct result of the volcano e.g. volcanic gas SECONDARY HAZARDS: occur as result of the primary hazards e.g. tsunamis

Primary Volcanic Hazards Lava Flows Pyroclastic Flows Ash and Tephra Fall Volcanic Gases

Secondary Volcanic Hazards Lahars Jokulhaup Volcanic Landslides Tsunamis Flooding Climate change

TASK Research then write your own detailed notes in the workbooklet on types of volcanic hazards. Try and find at least 1 named example for each. 1: Primary Hazards (Lava flows, pyroclastic flows, ash falls, gas eruptions) 2: Secondary Hazards ( Lahars, jokulhlaup) Refs: Hodder p12-13 and any other sources you can find

‘Why are some volcanoes more hazardous than others?’ TASK . Read and make notes from the Geoactive article: ‘Why are some volcanoes more hazardous than others?’

June 2012: Study fig 1, a satellite image of the Mayon volcano in the Philippines and the area to the south and east. Comment on the nature of the hazards that this volcano may present. ( 7) Tips: So , you need to look AT AND BEYOND the photo for comment… Think about the causes and consequences… Use connectives- i.e this could lead to.. and then possibly to…etc

Today’s lesson objectives To understand what makes a volcano hazardous To be able to classify into primary hazards ( lava flows, pyroclastic flows, ash falls, gas eruptions) and secondary hazards(lahars, jokulhlaup)