ESCI 2010 Lecture Notes - Lecture 15: Mercalli Intensity Scale, Epicenter, Seismogram
14 Mar 2016
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Document Summary
Come about as a consequence of wave-like disturbances of the ground that eminate from some center of disturbance. Stress applies, strain released: elastic vs. brittle deformation, materials become unstable and undergo damage, stress is force per unit area. If you take away stress, materials go back to the way they look before before deformation began (elastic) If you get to point of rupture, there is no going back. As stress is added more rapidly: if you take away stress, would go back to way it was, up to that point, deformation is elastic. When you reach the limit of elastic behaviour (elastic limit), after that there is plastic deformation that proceeds to some point at which there is rupture. Depth classification: shalloe (33 km) most earthquakes, intermediate (to 300 km, deep (700 km) Earthquake belts: circum-pacific, tethyan, oceanic ridges. Earthquakes tend to follow particular lines that, for the most part, coincide with palte boundaries.
