hazards and lavas
- Created by: michael-j-inman
- Created on: 14-01-14 12:23
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- hazards and lavas
- hazards
- continental
- sismic activity
- rising magma can create volcainoes
- sismic activity
- oceanic
- effusive submarine volcanic activity
- creates effusive volcanoes on surface too can be phreatic though when mixes with ice
- effusive submarine volcanic activity
- oceanic and continental
- 80% of worlds volcainoes
- rising magma exploits weaknesses in the plate
- viscous magma can create explosive volcanoes like Pinatubo
- rising magma exploits weaknesses in the plate
- 80% of worlds volcainoes
- continental and continental
- shallow seismic activity
- e.g. in Pakistan in 2005
- shallow seismic activity
- oceanic and ocianic
- 80% of worlds volcainoes
- rising magma exploits weaknesses in the plate
- viscous magma can create explosive volcanoes like Pinatubo
- rising magma exploits weaknesses in the plate
- creates deep focused earthquakes like the chillie earthquake
- 80% of worlds volcainoes
- continental
- lavas!
- andesitic
- from the oceanic plates
- strata volcano
- not usaually frequent eruptions
- realeases ash and lava bombs
- cone shaped
- slopes built up of ash and lava
- can form secondary cones
- lava charachteristics
- viscous thick lava
- formed on destructive boundary ocean-cont
- strata volcano
- from the oceanic plates
- rhyolitic
- from the continental plates
- lava forms...
- ash and cinder cones
- gas and ash explodes in which lava boms are created
- explosive
- made fro a build up of ash and cinder making a concade shape
- acid dome volcainoes
- has steep convex slopes
- non frequent eruptions
- violent eruptions with pyroclastic flows
- ash and cinder cones
- lava charachteristics
- thick and vicous
- explosive as gas cannot escape through it
- lava forms...
- from the continental plates
- basaltic
- from the mantle
- lava forms...
- shield volcainoes
- gas easily escapes
- frequent non violent eruptions
- have gentle slopes and the lava travels long distance
- occurs along constructive margins and hotspots.
- shield volcainoes
- lava charactheristics
- runny low viscosity
- low in silica
- gas can easily escape
- lava forms...
- from the mantle
- cakaderas
- steep sided
- no summit
- a collapsed magma chamber cn fill with water
- non frequent eruptions
- andesitic
- hotspots
- e.g. Hawaii and Iceland
- a plume of a rising thermal current from the core rises to the athsenosphere
- the oceanic lithosphere is thin and due to a fall in pressure magma is created
- the rising magma burns through the crust
- this creates submarine volcanoes that eventually form islands
- due to plate movement these islands move away from the hot spot eventually becoming volcanically inactive
- the islands that have moved get eroded over time by the sea
- new island are created on the new area of the plate that has moved over the hotspot
- the islands that have moved get eroded over time by the sea
- due to plate movement these islands move away from the hot spot eventually becoming volcanically inactive
- this creates submarine volcanoes that eventually form islands
- the rising magma burns through the crust
- the oceanic lithosphere is thin and due to a fall in pressure magma is created
- a plume of a rising thermal current from the core rises to the athsenosphere
- e.g. Hawaii and Iceland
- examples of volcinoes
- ash cylinder
- Paricutin (mexico)
- caladera
- pinatubo
- yelloestone
- strata
- etna scicilly
- Untitled
- acid dome
- mount pele
- fissure
- moana loa
- hawaii
- moana loa
- ash cylinder
- hazards
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