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The Origin of Volcano-Tectonic Earthquake - Term Paper Example

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The paper 'The Origin of Volcano-Tectonic Earthquake' states that long-period volcanic earthquakes are a result of injecting magma into the rock surrounding the areas of such activity. When the injection goes on for long periods, they result in continuous quakes and possibly volcanic eruptions…
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The Origin of Volcano-Tectonic Earthquake
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Download file to see previous pages The boundaries occur in three key forms, namely transform, convergent or spreading depending on, respectively, whether they move laterally, toward or away from one another. According to the plate tectonic theory, earthquakes only take place in the brittle plates, which have relatively low temperatures and account for the 100 outermost kilometers of the earth. Temperature variations cause convection of rocks found deeper inside and induce stress, resulting in disturbance of the plates overlaying them. The stress deforms the overlaying plates and stores tremendous amounts of energy in them. When the accumulated stress surpasses the rocks’ strength, they suddenly break and release the elastic energy stored in them, which results in an earthquake.

The two common causes of earthquakes are the collision of tectonic plates and volcanic eruptions (Roman & Cashman, 2006). The shock waves emanating from testing nuclear weapons and some man-made explosions may also account for insignificant events of earthquakes, but they are not really considered as earthquakes because the shock waves do not have natural origins. Other artificial causes include the breaking of rocks to build tunnels for subways, railroads, and roads as well as mines, although the resultant seismic waves are not considered strong. Through the layers of earth, seismic waves which are energy waves, travel through the layers, and those of relatively low amplitude is known as ambient vibrations. Periods of changing activity often precede major earthquakes and are known as foreshocks. There can also be periods in which less frequent shocks are experienced as the masses of rock are temporarily ‘stuck’ and locked together (Tanimoto & Lay, 2000). After the main shock, further movements known as aftershocks are experienced, which are caused by the masses of rock settling into the new positions they have assumed. Aftershocks occur in the same regions as the main shock but are characteristical of lower magnitude. ...Download file to see next pagesRead More
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