reclaimed through the dumping of coarse sands and city garbages the vibrations of earthquakes last longer and the amplitudes. (iii) Most hazardous earthquakes causing human casualitis above 1,00,000 mark occurred in the year 1290 (in Chihli, China, 1,00,000 deaths in 1556 (in Shen-Shu, China, 8,30,000 deaths in 1737 (Kolkata, India, 3,00,000 deaths in 1908 (in Messina, Italy, 1,60,000 deaths in 1920 (in Kansu, China. M.; undersea earth quake.9 magnitude; epicenter 130 km off the coast of Sendai City near Lameng Village and 380 km north-east of Tokyo, at the depth of 10 km on sea bed; tsunami wave height 10m; more than 10,000 people killed; many cities. The depth of focus of earthquakes associated with the constructive plate boundaries ranges between 25 km to 35 km but a few earthquakes have also been found to have occurred at the depth of. For example, the earthquakes of New Madrid, Charleston, Boston, Tang-Shan, Koyna etc. India folds at places and when the energy reaches the elastic limit the rocks break up and trigger strike-slip and thrust fault earthquakes. The occurrence of severe devastating earthquake of San Francisco (USA) in 1906 led.F. It may be pointed out that the magnitude of such earthquakes depends upon the intensity of volcanic eruptions. It may be pointed out that the intensity of earthquake has been positively correlated with the levels of water in the reservoirs.
Examples, 1931 earthquake of Greece due to Marathon Dam, 1936 earthquake of Hoover Dam (USA) due to Lake Mead, Koyna earthquake (Maharashtra, India) of 1967 due to Koyna reservoir etc. The 1934-earthquake of Bihar was also considered to have been triggered by faulting activity underneath. (3) Aleutian tsunami: March 9, 1957, earthquake of the magnitude.3 on Richter scale, generated a Pacific-wide tsunami of 16 m height and adversely affected Hawaii islands. This belt represents the weaker zones of folded mountains where isostatic and fault-induced earthquakes are caused due to subduction of African and Indian plates below Eurasian plate. If we look at the world distribution of earthquakes (fig. Moderate and intermediate earthquakes are also called as shallow focus and intermediate focus earthquakes respectively.
How to make a good persuasive essay, Writing models for biographical essays, Marching forward essay,