Company Name: 炜立 张
About: Earthquake early warning refers to the use of the characteristic that the
propagation speed of seismic waves is lower than that of radio waves after an
earthquake occurs to warn in advance where the seismic waves have not yet
arrived. Generally speaking, the propagation speed of seismic waves is a few
kilometers per second, while the speed of radio waves is 300,000 kilometers per
second.
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