Find paragraphs, long and short essays on Earthquakes especially written for school and college students. Advertisements: According to them Koyna rift begins from Kaladgi in Karnataka and runs for a distance of 540 km through Koyna and terminates 40 km west of Nasik. For example, the Kangra earthquake of India in 1905 recorded.6 magnitude on Richter scale but it could cause deaths of only 20,000 people whereas 1976 Tang-Shan earthquake of China measuring.8.1 on Richter scale killed 7,50,000 people. Thus, the spreading of sea floor and fissure type of volcanic eruption cause earthquakes of moderate intensity. Advertisements: In fact, earth tremors are major precursor events of possible volcanic eruption in immediate future in any region. The earthquake belt extends through Sulaiman and Kirthar shear zones in the west, the Himalayas in the north and Burmese arc in the east. Reids elastic rebound theory very well explains the occurrences of seismic events in Californian valley which is very much frequented by faulting activity. Classification on the basis of Human Casualties: Earthquakes are grouped into 3 categories on the basis of their hazardous impacts in terms of human casualties: (i) Moderately hazardous earthquakes- When human deaths caused by severe seismic tremors are below 50,000 mark. DAAs AppChoices app here. Reid, one of the official investigators of the San Fransisco earthquake disaster, to advance his famous and much appreciated elastic rebound theory to explain the mode and causes of earthquakes mainly caused by fractures and faults in the earths crust and upper mantle. The Himalayan fault zone is not actually one fault but a broad system of interactive faults. Introduction to Earthquake: An earthquake is a major demonstration of the power of the tectonic forces caused by endogenetic thermal conditions of the interior of the earth.