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Category: Dog Training Courses Online | Author: admin 06.04.2014
Ground view of collapsed building and burned area at Beach and Divisadero Streets in the Marina District of San Francisco after the 1989 Loma Prieta earthquake. NEPAL is struggling to cope with the effects of two devastating earthquakes in the past month leaving over 8,500 dead and millions in need of assistance.
Iain Stewart looks at some of the world's most dramatic earthquakes and reveals the stories and science behind them.
According to sesmologists, earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves.
There are about 500,000 earthquakes a year around the world, as detected by sensitive instruments.

The seismicity, of an area refers to the frequency, type and size of earthquakes experienced over a period of time. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe. The largest earthquakes in historic times have been of magnitude slightly over 9, although there is no limit to the possible magnitude. The shallower an earthquake, the more damage to structures it causes, all else being equal. Seismologists studying the massive 2004 earthquake that triggered killer tsunamis throughout the Indian Ocean found that the quake had weakened at least a portion of California's famed San Andreas Fault.

We discover why quakes can last 60 times longer on the moon than on Earth, how one particular earthquake fault line can produce hallucinations, and how 1960s Cold War spying gave scientists a crucial clue to understanding them. Each year the southern California area alone experiences about 10,000 earthquakes, most of them not felt by people.

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