Introduction to Tsunami. {Big answer please!}
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Answer:
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Explanation:
Tsunamis are one of nature's most powerful and destructive forces.
Two large events in the early twenty-first century demonstrated the devastating impacts of a tsunami. Although they occur relatively infrequently, and most are small and nondestructive, tsunamis are a serious threat to life and property. Since 1850, tsunamis have claimed hundreds of thousands of lives and caused hundreds of billions of dollars in damage around the world.
A tsunami is a series of long waves generated by a large and sudden displacement of the ocean. Large earthquakes below or near the ocean floor are the most common cause, but landslides, volcanic activity, certain types of weather, and near earth objects (e.g., asteroids, comets) can also cause a tsunami.
The often heard term "tidal wave" is very misleading. Tsunamis are not related to tides, so tsunamis are not tidal waves.
Tsunamis radiate outward in all directions from their source and can move across entire ocean basins. When they reach the coast, they can cause dangerous coastal flooding and powerful currents that can last for several hours or days.
A tsunami can strike any ocean coast at any time. There is no season for tsunamis. This is quite evident when we look at some records of past tsunamis.
There are two types of tsunami generation: Local tsunami and Far Field or distant tsunami. The coastal areas in the Philippines especially those facing the Pacific Ocean, South China Sea, Sulu Sea and Celebes Sea can be affected by tsunamis that may be generated by local earthquakes.
Local tsunamis are confined to coasts within a hundred kilometers of the source usually earthquakes and a landslide or a pyroclastics flow. It can reach the shoreline within 2 to 5 minutes.
Far field or distant tsunamis can travel from 1 to 24 hours before reaching the coast of the nearby countries. These tsunamis mainly coming from the countries bordering Pacific Ocean like Chile, Alaska in USA and Japan.
The Pacific Tsunami Warning Center (PTWC) and Northwest Pacific Tsunami Advisory Center (NWPTAC) are the responsible agencies that closely monitor Pacific-wide tsunami event and send tsunami warning to the countries around the Pacific Ocean.