GEOL-1010 Lecture Notes - Lecture 7: Indian Ocean, Longwave, Epicenter
5 Feb 2018
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Document Summary
Lost continent found in the indian ocean: nera mauritius, some mauritius rocks recently dated are much older than the island, most of it is submerged or buried. How powerful are large earthquakes: compared to come other things: graph on slide 9, some are very powerful which is why they cause widespread damage. The point of movement: focus- the actual point right on the fault line where the motion occurred. It doesn"t mean the entire fault line moved, just a section. Usually some distance below ground: epicenter- the point along the ground surface directly above the focus, these are not the same thing! Important for emergency procedures- which towns/ cities will need the most help: doesn"t tie into where the motion occurred, just where to focus relief efforts, the foucus is usually very shallow (2-20 km below the surface) Movements before and after: foreshocks- motions that occur before the main earthquake.
