CEE 1030 Lecture Notes - Lecture 6: New Madrid Seismic Zone, Love Wave, Subduction
9 Sep 2020
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Shaking - shaking is what causes buildings to fall, which is what kills people (the actual shaking doesn"t kill people) Liquefaction - ground stops behaving like the ground, behaves more like quicksand. Earthquakes don"t hurt people, buildings collapsing and tsunamis hurt people. Depth of earthquake - shallow = bad. The intensity and duration of vibrations - more intense shaking for longer = bad. Nature of the material that structure rests on - unconsolidated = bad. If you build a house on a rock, the rock is probably going to stay a rock. Possible to engineer buildings that can withstand a lot of shaking (really expensive) What we try to quantify with the mercalli index: damage to buildings and what people feel. Liquefaction - loss of ground cohesion due to increase in pore pressure of fluid. Occurs in saturated soils during earthquake shaking. Poor pressure increases and soil particles can move with respect to each other.
