Causes of Earthquakes
Trembling or shaking his head movement Earth's surface. Most earthquakes are minor tremors.Usually the larger the earthquake began to shake slightly, but in the rapid formation of one or more violent shocks, and, ultimately, the gradual reduction of forces in the vibration, known as aftershocks. Point of origin of the earthquake ground floor is your concern, this focus on the surface of the top of the epicenter. The magnitude and intensity of the earthquake is by the use of scale, for example, the Richter scale and Mercalli scale.
Seismic

The destruction and loss of life caused by the earthquake continued to decline in the structure, glass and objects. Flexible architecture built on the bedrock is usually more resistant to earthquake damage of the rigid structure, the establishment of loose soil. In some areas, the earthquake could trigger landslides sliding down hillsides, can be buried below the house. A submarine earthquake waves caused by the devastating tsunami waves outward epicenter of the quake and flooding coastal cities.
On average, the 1000 earthquake intensity of 5.0 or higher, an annual record. A major earthquake (intensity 8.0 or higher) occur each year a major earthquake (intensity 7,0-7,9) occurs 18 times a year a strong earthquake (intensity 6.0-6.9) 10 months, moderate earthquakes (intensity 5.0-5.9 more), twice a day. Since most of which occurred in the ocean or sparsely populated areas, all have been ignored, but the earthquake. The most important earthquake in Lisbon, Portugal (1755), New Madrid, Missouri (1811 and 1812), Charleston (1886), Assam, India (1897 and 1950), San Francisco ( 1906), Messina, Italy (1908), Gansu, China (1920), Tokyo, Japan (1923), Chile (1960), Iran (1962), Managua, Nicaragua (1972),Guatemala (1976), Hebei, China (1976), Mexico (1985), Armenia (1988), Luzon, Philippines (1990), ñ, Japan (1993), Kobe, Japan (1995), Turkey Yizi Mi Special (1999), Central Region (1999), Oaxaca, Mexico (1999). Lisbon and Chilean earthquakes accompanied bytsunamis. In the Ching Ming Festival in 1964, an earthquake in North America, the most serious attack in Alaska, measuring from 8.4 8.6 intensity. Apart from raising the 70,000 square miles (181.3 thousand square kilometers) of land and devastating several cities, triggering tsunami, caused by damage to Southern California.
10 of the 15 largest earthquakes in the United States occurred in Alaska, and eight of the 15 largest continental United States occurred in California. The recent earthquake, the U.S., including in February 1971, the campaign's San Fernando fault near Los Angeles. It has shaken the area for 10 seconds, to promote some mountains 8 feet (2.4 meters) increase, the losses caused by the death 64 people worth 500 million U.S. dollars. In 1989, Loma Prieta earthquake, the Santa Cruz to shake hands for 15 seconds, the intensity of 7.1, killing 67 people, collapsed buildings and bridges. In January 1994, a 6.6 earthquake, its epicenter in N Los Angeles, causing significant damage to urban infrastructure, thousands of people homeless.





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