EARTHQUAKE LOOP
Earthquake = release of built-up stress energy.
Focus = underground origin.
Epicenter = surface above focus.
P waves = fastest, compressional, first.
S waves = slower, vertical motion.
Surface waves = Love and Rayleigh.
Magnitude = energy released.
Intensity = observed effects.
Richter scale = each number is 10x stronger.
Hazards = fire, landslides, liquefaction, tsunami.