A great earthquake, one of the largest measuring 8.9 on the Richter scale hit northern Japan throwing life into virtual chaos in Tokyo and surrounding areas. A massive wave of mud and water from the Pacific was seen reaching the coastal towns of northern Japan completely submerging the buildings and sweeping the cars, ships, or anything in its way. A massive fire broke out in an oil refinery in Chiba in north eastern Tokyo. Looking at the devastataion, casualites could be huge. The Pacific Tsunami Warning Centre has issued Tsunami warning with tidal waves anywhere between two to four meters above sea level to many countries including US state of Hawaii, Australia, New Zealand and the entire coast of Central and South America. The tsunami travels at about 800 kilometers per hour. A great earthquake is the one which measures 8.0 and up on the Richter scale and can cause tremondous damage across several thousand miles. According to USGS, on an average there will be one great earthquake occurring every year.