EPSC 201 Lecture Notes - Lecture 4: Continental Crust, New Madrid, Missouri, Quick Clay

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Collisions zones organic crustal compression o continental lithosphere compresses along thrust faults o earthquakes can be very large o orogenic uplift creates landslide hazards. Divergent plate boundaries: mid ocean ridges o two types of faults in mor"s o normal faults at the spreading ridge axis o strike slip faults along the transforms. Convergent plate boundaries have shallow, intermediate, and deep earthquakes o shallow earthquakes occur on both plates o normal faults form where the down going slab bends o thrust faults form at the contact between plates (causes large earthquakes that o lead to tsunamis) S waves arrive next (second) o they produce a pronounced back and forth motion o this motion is much stronger than that from p waves o s waves cause extensive damage. R waves are last to arrive o the land surface undulates like ripples across a pond o these waves usually last longer than the other kinds o r waves cause extensive damage.

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