题目内容

Earthquake body waves are divided into two types called primary (P) waves and secondary (S) waves.

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Most earthquakes are produced by the rapid release of elastic energy stored in rock that has been subjected to great stress.

In 1935, Charles Richter, a California seismologist, devised a simple procedure that is now used throughout the world to measure the size of an earthquake, the Richter Magnitude.

L waves are confined to the Earth's surface and outer layers because, like waves on the ocean, they need a free surface to ripple in order to exist.

The vibration direction of S waves is perpendicular to travelling.