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Posted by admin on Aug 16, 2018

The TelegraphTsunamis will become more common and more ferocious with global warming, scientists have warned after a study found that global sea level rises will increase the risk of coastal cities being wiped out. Smaller earthquakes that currently pose no serious tsunami threat could unleash waves capable of inundating coastal cities, researchers found in a study focusing on the city of Macau in China. Currently it is considered safe from tsunamis, despite lying within a major earthquake zone. At today's sea level, it would take a very powerful earthquake tipping past magnitude 8.8 to cause widespread tsunami flooding in Macau. But a half-metre rise in sea level - predicted to occur in the region by 2060 - could more than double the chances of a huge tsunami swamping the territory, according to the research. A three-foot sea level rise, expected by 2100, would increase the risk up to 4.7 times. The source of the earthquake danger is the Manila Trench, a massive crack in the floor of the South China Sea formed by the collision of two tectonic plates. It has generated numerous earthquakes, though none larger than magnitude 7.8 since the 1560s. A modest rise in sea levels would greatly amplify the tsunami threat from smaller earthquakes, the computer simulation study showed. Cities most prone to natural disaster Lead researcher Dr Robert Weiss, from Virginia Polytechnic Institute and State University (Virginia Tech) in the US, said: "Our research shows that sea-level rise can significantly increase the tsunami hazard, which means that smaller tsunamis in the future can have the same adverse impacts as big tsunamis would today. "The South China Sea is an excellent starting point for such a study because it is an ocean with rapid sea-level rise and also the location of many mega cities with significant worldwide consequences if impacted." The team's findings are reported in the journal Science Advances.

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https://www.yahoo.com/news/rising-sea-levels-threatens-coast...

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