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Topic Area 1 (Destructive (Subduction (Benioff zone, Shallow to deep focus…
Topic Area 1
Destructive
Mountains inland
Secondary hazards: landslides
Subduction
Benioff zone
Shallow to deep focus
High magnitude earthquakes
Tsunamis due to megathrust on ocean floor
Explosive volcanic eruptions
Melts silica from continental crust
Partial melting of oceanic crust
Viscous magma > 66% silica
Lahars, Ash, Pyroclastic Flows
Builds up gas pressure
Ocean/ Cont. Ocean - Ocean
Constructive
Basic magma > 45 -52% silica
Little gas build up
Effusive eruptions
Low magnitude earthquakes
Upper mantle melting
Lower population
Islands e.g. Iceland or under ocean
Less hazardous
Conservative
High magnitude earthquakes
Often shallow focus
San Andreas Fault
Stickn+ slip nature
No Volcanoes
No magma generation