求翻译：地震海啸是由海底的地震和火山爆发而引起的。地震和火山爆发可以提高周围的海平面，使波涛传得更远。这时如果波涛穿过大洋的话，波高可以达到2米，波长也可以达到500千米，而且时速大约可达800公里。是什么意思？

By undersea earthquake and tsunami earthquakes and volcanic eruptions caused. Earthquakes and volcanic eruptions can increase the sea level around, so that the waves pass farther. Then if the waves through the ocean, then up to 2 m wave height, wavelength can reach 500 km, and about up to 800 kilome

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The earthquake tsunami is causes by the seabed earthquake and the volcanic eruption.Periphery the earthquake and the volcanic eruption may enhance the sea level, causes the mighty waves to pass on far.If by now mighty waves traversing ocean, the wave height might achieve 2 meters, the wave length al

Tsunami was caused by an underwater earthquake and volcanic eruption. Earthquakes and volcanic eruptions can raise the sea level around, make waves even further. Then if the waves across the ocean, waves up to 2 meters high, wavelength can be 500-kilometer, and approximately 800 kilometers per hour.