EARTHSC 2GG3 Lecture Notes - Lecture 3: Logarithmic Scale, European Space Research Organisation, Silt
16 Sep 2016
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Figure belowish : red line is fault focus is underground, where rupture of land actually breaks waves of energy going out in every direction. Earthquake magnitude the magnitude of an earthquake is expressed as a number to one decimal place this type of measurement was first developed by richter in 1935. The richter scale was a measure of the strength of a wave at a distance of 100 km from the epicenter. Since then, more accurate methods have been developed and the richter scale is no longer in use. Example: an m7 earthquake represents 10x 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 (don"t memorize)
