A volcanic eruption is a volcanic explosion that occurs when the sound of a volcanic eruption is heard in an area several hundred kilometers away but not in the closer area. It is caused by the reflection of sound waves from a temperature inversion layer several tens of kilometers above the ground. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
〘名〙 火山噴火のとき、その爆発音がより近い区域では聞こえず、数百キロメートル遠方の区域で聞こえる場合に、遠方の、その音の聞こえる区域をいう。地上数十キロメートルにある気温逆転層からの音波の反射によって生ずる。
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