of 250 km length and 60 km width, ruptures and faults in the ground surface etc. The plates get stuck, building up tension. The waves generated by an earthquake are called seismic waves which are recorded by an instrument called seismograph or seismometer at the epicentre. It can even be as much as. Even the earthquakes of Assam are also included in this zone. The strongest quake ever recorded had a magnitude.9.
Uttar Kashi (Uttaranchal) earthquake of 1991 and Latur-Kilari quake (Maharashtra) of 1993 (India) flattened many buildings. Advertisements: There are two aspects of early warning system. Tsunami : A tsunami is a series of travelling ocean waves which are set off by geological disturbances near the floor of the ocean. When the cyclone is beyond the range of coastal radars, its intensity and movement is monitored with weather satellites. The Asiatic plate is moving southward whereas the Indian plate is moving northward and hence the northern margin of the Indian plate is being subducted below the Asiatic plate. The shocks generated by Peruvian earthquake of May, 1970 triggered off the collapse of ice caps seated on the peak of high mountain called Huascaran of 6654 m height near the town of Yungay in Peru. Gradually, other parameters like precipitation, etc. But a small chance of them being stronger in magnitude cannot be ruled out, in which case the first and aftershocks become known as foreshocks.
The IMD has published the tracks of the cyclones since 1891 and updates them every year in its quarterly scientific journal, Mausam. Annually, on an average, there are 800 quakes capable of causing damage with a magnitude of 5-5.9, and 18 major ones with a magnitude of 7 or more. Though the plains of west Bengal comes under the zone of least damage risk but the devastating severe earthquake of Kolkata of 11 October, 1737, killing 300,000 people, puts a question mark against this concept. (22,000 deaths Tabas earthquake of Iran of 1978.D. Earthquakes happen deep underground along tectonic plate boundaries. California's many earthquakes are a result of this dynamic plate boundary.