EARTHSC 1G03 Lecture Notes - Lecture 9: 32X, Seismogram, Mercalli Intensity Scale
14 Oct 2016
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Mountain belt forms along between contients (e. g himalayas) Often link sections of divergent or convergent margins. Associated with shallow focus earthquakes (e. g san andreas fault - pacific /n. Important because associated with earthquakes - satellites and gps can detect plate movement. Earthquake - motion or trembling of the ground caused by sudden displacement of rock. Strain (deformation or bending in response to stress) Point of initial movement on a fault, where seismic waves originate. Point on earth"s surface directly above the focus. Rock vibration parallel to direction of wave propagation. *p waves will pass through fluid, s waves will not. S waves do not pass through outer core. Surface waves - travel on the earth"s surface. Rock vibration perpendicular to direction of wave propagation. Seismograph - records motions - global network of seismograph stations. Seismogram - paper record on which p waves, s waves can be differentiated. Need three or more stations to locate epicentre.
