Japan sees about an 80 per cent chance of a magnitude 8 to 9 earthquake along a seabed zone known as the Nankai Trough. TOKYO: Japan's economy could lose as much as US$1.81 trillion in the event of a long-anticipated megaquake off its Pacific coast, which could trigger devastating tsunamis, the collapse of hundreds of buildings and potentially killing about 300,000 people, a government report said on Monday (Mar 31). The expected economic damage of 270.3 trillion yen, or nearly half of the