GEO 101 Lecture Notes - Lecture 15: Seismometer, Aseismic Creep, P-Wave
22 Feb 2017
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Document Summary
Developed by harry fielding reid following the 1906 san francisco earthquake. Describes how energy builds up and is released during an earthquake. Some examples: tectonic forces (plate tectonics, movement of magma, sudden slip on a nearby fault, giant landslides, water pumping or injection, underground nuclear bomb tests. This can happen in three ways: fault creep: slow, gradual displacement, numerous, small earthquakes (periodic energy release, store up energy until major earthquakes occurs. Small earthquakes before the major event are called foreshocks (generally in days or months leading up to the main earthquake); fault is starting to move. Adjustments after a major earthquake can generate small earthquakes called aftershocks. Earthquakes set-off far away from the main earthquake (outside the aftershock area) Landers event triggered earthquakes up to about 1300 km away. Review questions: as strain/energy builds up in rocks, it causes the rocks to permanently deform, true.
