1914年,德國地球物理學家賓諾·古登堡(Beno Gutenberg)發現地下2885千米處地震波的傳播速度有明顯變化,其中縱波的速度明顯下降,橫波完全消失。後來證實這裏是地核與地幔的分界層[1]。
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