EOSC 114 Chapter Notes -Seismometer, Cascadia Subduction Zone, Love Wave
31 Jan 2013
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Document Summary
Globally, earthquakes located mostly on tectonic plate boundaries. Higher frequency = lower magnitude; higher magnitude = lower frequency. Plate boundaries+ faults: divergent: plates move apart at mid-ocean ridges & spreading centres small earthquakes normal dip-slip faults, transform: plates slide beside each other (shearing) many medium-large earthquakes strike-slip faults, convergent type 1: plates collide, causing compression. One plate is more dense and subducts under other small to largest earthquakes (at subduction zone) reverse dip-slip faults: convergent type 2: plates collide, causing compression. Neither subducts so crumple, form mountains small to large earthquakes reverse dip-slip faults. Constant movement of tectonic plates over many years builds pressure, storing pe. Using distances from 3 recording stations, find the 1 overlapping spot this is epicentre. Type of ground greatly affects shaking intensity hard rocks don"t move as much, softer rocks will move more. Magnitude: the strength of an earthquake, on its own. Intensity: how much of the earthquake is felt; see 12.
