Physics Of Earthquakes And Its Effects - 1597 Words

Physics of Earthquakes Introduction A failure in the interior of the Earth’s crust is the cause of most earthquakes. Once the stress inside the crust grows beyond the strength for that location of the crust, a failure occurs within the crust and seismic waves, which we know as earthquakes, are radiated outward. It was once thought that this description of seismic activity was the cause for all earthquakes, but now seismologists know the way earthquakes form and start is a very diverse process. Most earthquakes are classified in the category of being brittle failures, which generate strong seismic waves; some earthquakes involve slow slip motion. There is also evidence to suggest that some earthquakes are more of a thermal process due to large amounts of heat generation, rather than large seismic activity. (Scholz 2002) Also, some earthquakes are not the result of faulting however, but caused by large landslides. In the early days of seismology, these differences were noticed qualitatively but the technology avai lable during that time made it hard to accurately tell the difference. Before an earthquake takes place, there is a large buildup of potential energy. The energies involved in earthquakes can be described by the elastic strain energy W, plus the radiated energy Er, the energy mechanically dissipated during an earthquake, Eg and the thermal energy due to heat dissipation, Eh. Since this equation is a description of potential energies, the actual event of anShow MoreRelatedA Report On Marine Geophysicists1081 Words   |  5 Pagesdanger. After 2004, a 9.1 earthquake induced the Indian Tsunami that killed more than 250,000 people and left a million others affected in one day, people started to observe the amount of destruction caused by tsunamis (Helal Mehanna, 2008, p.787). The disaster was of such a magnitude that now has educated most people about the subject. 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