Earth Sciences 2240F/G Chapter Notes -Richter Magnitude Scale, Mercalli Intensity Scale, Thrust Fault
19 Dec 2012
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1201: syrian/ egyptian earthquake killed 1. 1 million people. 1556: china, 830000 killed in shansi province. 2004 tsunami: dead and missing of 250000. 2010 haitian quake: maybe 316000 dead, but there is no census. An earthquake is the ground shaking that accompanies sudden movement on a fault, but also may be the shaking produced by motion of magma underground, a fast-moving landslide or an underground nuclear explosion. The boundaries of plates are active regions, and most of that action takes the form of: normal faults, reverse and thrust faults, strike-slip or transform faults. Stress energy vs. strain: at low applications of stress, the rock will deform, but as soon as you release the stress, the deformation disappears (elastic). If you impose greater stress, the rock will deform to its elastic limit, and when the stress is released, not all the deformation disappears (plastic deformation).
