Cause Of Earthquakes

Contrary to this rule, even so, 1750 there was one in London, and 1811 a series of the earthquakes arrived Missouri (USA). There is no clear explanation for the occurrence of these crashes in the centre of continental dishes. It is possible than deep down in the earth crust there is uncharted borders of dish, which cause these earthquakes.
Seven #Percent of all the crashes are of volcanic origin. They are the so-volcanic earthquakes called, the crashes are linked time, place, and cause in the volcanic activity. General, these are localised crashes. Three #Percent of crashes can be classified like landslide earthquakes. They are caused by ceilings atropellados of underground cavities that can have formed a lot of different ways. These are localised, earthquakes of short range.
The horizontal Movements have been remarked in the Saint the failure of Andreas. These careers of fault to the border between the North American and the Pacific dishes. 1989, during the Loma Prieta earthquake, the dish norteamericano Northerner has increased a subway, while the Pacific the dish has moved two subways in the northwest. Fortunately, the part of entity of the waves of crash has been captured under earth.
The hypocentres arrives also in surfaces sloping of the ocean to the earth. They arrive generally in the depth of until 700 kilometers. This region is called the Wadati-Benioff zone. Besides, in these regions there can be also horizontal movement. 1995, parts of the Island of Port and Rokko the Island has moved 4 subways! Average, the ranges of movement between 10 and 20 centimetres.

Regions further out of the tectonic the dishes experience big earthquakes least frequently. These regions comprise, between another, north Europe and the oriental portion of United States.
This movement of parallel dishes, collide, or fracture. If the dishes drift aparta, only the light crashes will arrive. The causes of crashes stronger vary. When one of the dishes slides on the another, creates big tension, and when this tension is freed finally, he causes an earthquake. A such earthquake arrived in 1985 Ciutat of Mexico, murdered 10.000 people.
During the time of the Greek philosopher Aristotle, the people have believed that the earthquakes are caused by underground fires and storms. Japan, the people have thought that the earth has been carried by a gigantic fish and that his movements caused the earth to shake.
Today, our knowledge regarding the causes is fairly accurate. 90 #Percent of the cases, the cause of the earthquakes is linked directly to the tectonic process in the lithosphere. More Often, arrive to the region of borders of dish.
Most of common cause is the movements in faults situated vertically, which was the case of the earthquake in Armenia, 1988. The hypocentre was 10 kilometers down the surface of the earth, even so, the fault has penetrated entirely in the surface.
Earthquakes with hypocentres that cause in depths besides that 100 kilometers arrive more often island or of the continental edges crests, which are located in the vicinity of trenches of deep ocean or young volcanic mountains, as the island arch of Japan or the west coast of South America. Here, the dishes collide such way, that the dish that is bent #down goes down under the overlapping dish to the mantle of the earth.

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