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  • Publicado : 26 de octubre de 2010
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EARTHQUAKE

More or less violent jolt of the terrestrial bark, which takes place always to a certain depth departing from an epicentre The origin of the disturbance (area or hipocentro) it(h can beplaced in a zone of friction between plates. The arrival of the shock waves to the different points of the terrestrial bark allows to determine the epicentre of the tremor (place of the surfaceplaced on the area) .So manifestations of the terrestrial dynamics are more frequent than seems, especially in active zones of the planet; but only news comes when they turn into destructive phenomenaHere we appreciate clearly how it is an earthquake

TSUNAMIS

They are formed when the oceanic bed is raised suddenly by an earthquake. This provokes a great agitation in the waters andoriginates the waves that form the tsunami.
In its origin, they are almost imperceptible, 40 cm or less.
A wave and the following one, are separated by more than 1 km, but they are amplified to measurementapproaching the coast.
Tsunamis of height of 30m have taken place , but those of 6 or 7 meters, are also very destructive.
Finally to add that they go to a speed of approximately 800 Km./h, andthey can cross entire oceans, so that an earthquake in Chile can transport a tsunami in Japan

SCALE RICHTER

SCALE MERCALLI

Is the oldest scale,that stablishes a series of degrees that are thesame as the people notices when the earthquake goes on.
That is why we could say it is a completly subjective scale

DO YOU KNOW THAT...?

Every year in the whole world 12000-14000 earthquakesare produced and noticed.

EARTHQUAKE AND TSUNAMI IN CHILE

The 2010 Chile earthquake was an earthquake occurred at 3:34:17 EDT (UTC-3) Saturday February 27, 2010, which reached a magnitude of 8.8MW. The epicenter was located in the Chilean Sea, opposite the towns of Curanipe and Cobquecura, about 150 miles northwest of Concepción and 63 miles southwest of Cauquenes, and 47.4 miles beneath...
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