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EARTHQUAKES
Posted on: 22 June 2010
Earthquakes are generally regarded as the most destructive force of nature. While a long-term world-wide comparison shows that the number of deaths and the magnitude of economic losses caused by storms and floods by far exceed those by earthquakes, it is nevertheless true to say that no other natural phenomenon creates such a massive psychological shock
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SEISMIC SEA WAVES (TSUNAMIS)
Posted on: 21 June 2010
Seismic sea waves, generally referred to by the Japanese word “tsunami”, occur after strong seaquakes or large submarine landslides often induced by earthquakes or volcanic eruptions in the sea or on the coast. Theses waves spread out in all directions at great speed which depends on the depth of the water.
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VOLCANIC ERUPTIONS
Posted on: 20 June 2010
Class A volcanoes are often commonly held to be extinct, but to assess volcanic activity periods as long as hundreds or even thousands of years are required. An example that illustrates this is the eruption of Pinatubo on the Philippines. Before the eruption in 1991, the last time it became active was 600 years previously. The volcano El Chichon in Mexico was considered to be totally extinct before it erupted in 1983.
