GEOG 1350 Chapter Notes - Chapter 3: Mercalli Intensity Scale, San Andreas Fault, Aseismic Creep

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Result from the rupture of rocks along a fault (fracture in earth"s crust) Rocks on opposite sides of the fault move suddenly and energy is released in the form of seismic waves. The epicentre of the earthquake is the point on the surface of earth directly above the fault rupture. The focus (hypocentre) is the location of the initial rupture along the fault located directly below the epicentre. Earthquakes are studied by seismologists who use the term magnitude to express the amount of energy an earthquake releases. Earthquake intensity provides a measure of the effect of an earthquake on people and property. The size (magnitude) of an earthquake is expressed by a decimal number. The scale of judging an earthquake is called the richter scale. In modern times however, we use the body-wave scale based on the strength of the wave travelling through earth. There"s also the surface-wave scale is based on earthquake waves that travel through the surface.

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