GEOG 1350 Lecture Notes - Lecture 2: Richter Magnitude Scale, Epicenter, Seismogram

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Earthquakes located away from the lines, are caused by people (ex: fracking) The epicentre is directly above the focus and it is ground level. No not use the richter scale anymore measure the size of a wave (quantitative scale) the moment magnitude scale. The scale takes into account the geographic area: the are ruptured along the fault, the amount of movement along the fault, the elasticity of the crust at the focus. An m7 earthquake represents 10 times the amount of ground motion as an m6 earthquake . There are only a few m9+ earthquakes each century. There are three types: reverse faults, the hanging wall has moved up relative to the footwall inclined at an angle steeper that. 45 degrees: thrust faults, these are similar to reverse faults except the angle is 45 degrees or less, normal faults, the hanging wall has moved down relative to the footwall. Potentially active: movement during the past 2. 6 million years.

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