...the boundary at a depth of 10 to several tens of kilometers underground where seismic wave velocity and density increase rapidly. It is often abbreviated as the M discontinuity or Moho surface. In 1909, Yugoslav geophysicist Andrija Mohorovičić (1857-1936) noticed that the travel time curve of an earthquake that occurred near Zagreb bent at a distance of about 200 km from the epicenter, and he thought that there was a surface where the seismic wave velocity increased rapidly at a depth of about 50 km. ... *Some of the terminology that refers to "M discontinuity" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…地下10~数十kmの深さにある地震波速度や密度の急増する境界。M不連続面あるいはモホ面と略称されることが多い。1909年,ユーゴスラビアの地球物理学者モホロビチッチAndrija Mohorovičić(1857‐1936)は,ザグレブ付近で起こった地震の走時曲線が震央距離200km付近で折れ曲がることに気づき,深さ50km付近に地震波速度の急増する面があると考えた。… ※「M 不連続面」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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