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2004年12月24日印尼苏门答腊地震发生时,地震仪大概只用了几秒钟就测出这次大地震的震级。但仪器开始测的是震级大约是8.0级,并说明没有巨大海啸风险。而地震发生了5小时后,研究人员才将震级改为9.0级或更大,这意味着有发生巨大海啸的高风险。与此同时,以喷发速度移动的波浪海?
When the Sumatra earthquake in Indonesia took place on December 24, 2004, the seismometer measured the magnitude of the earthquake in only a few seconds. However, the instrument began measuring a magnitude of 8.0 and showed no huge risk of a tsunami. Five hours after the earthquake, the researchers changed the magnitude to 9.0 or greater, which means there is a high risk of a huge tsunami. At the same time, waves that move at the eruption speed?