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。
Some geologists feel that the method they used, probabilistic seismic hazard analysis, may underestimate the possibility of earthquake hazards.
一些地质学家认为他们当前使用的方法，即基于概率的地震威胁分析，可能会低估地震威胁的可能性。
Deep reflection seismic method is characterized by high resolution ratio, accuracy and reliability, and is hence an effective technique for geoscience research.
深反射地震方法分辨率高、准确可靠，是用于地学研究的一种有效方法技术。
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