Geography 2152F/G Final: Geography 2152F/G F/G Final: Geography of Hazards Final Review Notes.docx

• School: Western University
• Department: Geography
• Course: Geography 2152F/G
• Professor: Mosicki

Document Summary

Geo of hazards lecture 7 earthquakes. 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 seismograph and compared by magnitude. The magnitude of an earthquake can be expressed as a number to one decimal place. This type of measurement was first developed by richter in 1935 (we do not currently use this scale despite people in the media referring to it) The richter scale was a measure of the strength of a wave at a distance of 100km from the epicenter. Since then, more accurate methods have been developed; richter scale no longer in use. The scale is determined by: the area ruptured (impacted/breakage) along a fault, the amount of movement along the fault, the elasticity of the crust at the focus. Similar to richter scale, it is logarithmic.