Geography 2152F/G Lecture 7: Geo 2152 Week 7-Lecture Earthquakes
14 Feb 2019
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Document Summary
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 epicenter; the focus is located directly below the epicenter. They are measured by seismographs and compared by 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: not used anymore. The richter scale was a measure of the strength of a wave at a distance of. Since then, more accurate methods have been developed and the richter. Today, earthquakes are measured using the moment magnitude scale (m). The scale is determined by: the area ruptured along a fault, the amount of movement along the fault, the elasticity of the crust at the focus. Similar to the richter scale, it is a logarithmic scale.
