倪四道
倪四道-
倪四道说，P波（Pwaves）早期到达的非破坏性地震波在计算机的辅助下可以在10秒内用来探测并计算出发生地震的范围。
He said that P waves early-arriving non-destructive seismic waves can be used to detect and calculate the scale of an earthquake within ten seconds with the aid of computers .
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倪四道说，北川的人们通过早期预警系统可能有提前10多秒钟的地震警告，这能让人一些人转移到户外，而且火车也可以停车从而避免出轨事故。
People in Beichuan could have had a ten-second warning of the earthquake with an early-warning system , allowing some to move outdoors and trains to stop to avoid derailing , said Ni .