Scientists are constantly in search of this unknown. The major events of the earthquakes from the human viewpoint are realized on review of some major catastrophes.
Minute observations and records at least have been able to pin point the focus or the epicenter of these earthquakes in the historical past. These studies could reveal two great seismic belts in the entire globe.
Earthquake means: numerous tremors, both powerful and weak are the results of disturbances within the body of the earth itself logically are called Earthquake.
Why & How Eart hquakes Happen?
Reasons could be many; pinpointing is always after the event. They may be caused by various activities at the earth's surface such as ebb and the flow of the tides, the rush of traffic in the city streets, the tumbling of streams over high falls, magma tic outbursts from within the interior of the earth or explosion of high power nuclear or atomic bomb and so and so forth
What Are They?
Most of the catastrophic events of earthquakes are associated with any of these two belts. Seismically active region in these two belts are categorized as follows
1. Western Coasts of North and South America, the Aleutian Islands and the island groups along the eastern Coast of Asia such as Japan and the Philippines and thus borders the Pacific Ocean on the east, north and the west.
2. It includes the Mediterranean, the Alps, the Caucasus and the Himalayas and continues into the East Indies, where it intersects the first belt. Uttaranchal- Assam and Andaman- Nicobar island chains fall within the second belt and thus face frequent earthquakes of devastating nature.
Recently, a light earthquake (m.l=2.8) struck the coastal Kunnakulam region in the northern Kerala on 20.12.2006 at 19:19 hours local time.
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