EARTHSC 2GG3 Lecture Notes - Lecture 2: Mercalli Intensity Scale, San Andreas Fault, Richter Magnitude Scale
4 Oct 2016
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Document Summary
Earthquakes: they result from the rupture of rocks along a fault, energy from an earthquake is released in the form of seismic waves, they are mapped according to the epicentre; the focus is located directly below the epicentre. An m7 earthquake represents 10 times the amount of ground motion as an m6 earthquake. Magnitude and frequency of earthquakes: except for very large earthquakes, the magnitude on the moment. Magnitude scale is similar to the richter scale: the strongest earthquake to ever occur is m9. 5 in chile in 1960, in canada, it is m8. 1 in b. c. in 1949, there are only a few m9+ earthquakes each century. Earthquake intensity: the modified mercalli intensity scale is a qualitative scale based on damage to structures and the affect on people, it is based on 12 categories. 2. the bright green represents all the earthquakes that are happening red and green are all high risk areas.
