| environ. |
seismic sea wave A large seismically generated sea wave which is capable of considerable destruction in certain coastal areas, especially where submarine earthquakes occur. Although in the open ocean the wave height may be less than one meter it steepens to hights of 15 metres or more on entering shallow coastal water. The wavelength in the open ocean is of the order of 100 to 150 km and the rate of travel of a seismic sea wave is between 640 and 960 km/h (很大的地震引起的海浪，会在海岸地区摧毁很多房屋，特别是当发生海底地震时。尽管大部分海域，海浪的高度可能低于一米，但当它进入狭窄的海岸流域，海浪会升高到15米或更高。在开阔的海域，海浪的宽度是100到150公里，地震引起的海浪传播速度是640到960公里每小时之间。) |
