GEOG 1350 Lecture Notes - Lecture 2: Mercalli Intensity Scale, San Andreas Fault, Richter Magnitude Scale
2 Oct 2017
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Document Summary
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, quantitative scale. 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: qualitative scale. Identifying faults is necessary to evaluate the risk of an earthquake in a given area: not all faults reach the earth"s surface - blind faults are located below the surface. Fault types: there are two basic types of geologic faults distinguished by the direction of the displacement of rock or sediment, strike-slip faults displacements are horizontal, san andreas fault, dip-slip faults displacements are vertical.
