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what is an earthquake?
sudden shaking of the crust
what are earthquakes associated with?
rupture of a fault
accumulated stree energy is released as _______
when seismic wves radiate through earths surface what does it cause?
how many major cities lie on or near unstable ragions of earths crust?
what does groundshaking produce?
- sediment liquefaction
- mass wasting
- building collapse
explain elastic rabound theory:
- crust at rest- no strain
- crust deformed strain accumulates
- ruptured crust causing earthquake w/ elastic rebound
- fractured crust, fault zone- strain released
why do subduction zone have extreme earthquakes?
two plates touching build up stress
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