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Seismicity

Seismic waves

Greater the magnitude of earthquake, rarer they are- negative correlation
The point within the crust where pressure release occurs- focus/hypocentre
Closest distance from focus
Seismic waves don't all travel at the same speed. The rock type will effect velocity
Epicentre are worked out by looking at different…

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Mercalli scale

Measures and refers to likely damage
Ground observations
Measured on a scale of 1- 12, 1 being lowest and 12 being highest
1900's first created
Now called modified Mercalli scale (MMI)
Generally higher MMI near epicentre

Richter scale

Logarithmic
Measures magnitude (energy released from earthquake)
Scientific
10x difference…

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