This estimation relied on seismological techniques measuring the first seismic waves recorded, a method that lends itself to underestimation when a quake exceeds a magnitude of 8.5.
这项估算的依据是用地震技术测量记录到的第一批地震波，这种方法在地震超过8.5级时会造成估算不足。
The giant waves followed a massive earthquake with a magnitude of 8.0, according to the U.S. Geological Survey, that struck about 120 miles off the Samoan coast at 6:48 a.m. local time Tuesday.
据美国地质调查局(U.S. Geological Survey)的报告，当地时间周二早晨6点48分在距萨摩亚海岸约120英里的海域发生了里氏8.0级的大地震，随后发生了海啸。
Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves.
科学家根据地震波的强度和持续时间把地震强度分为了不同的等级。
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