tephra

Japanese: tephra
tephra

...These areas were also connected by the Tomei Expressway (opened in 1968), the Chuo Expressway (1968), the Fujinomiya Toll Road (1966), and other roads, making travel from Tokyo easier, and the foot of Mt. Fuji was transformed into a series of leisure destinations. [Masahide Shiki]
[Volcanic activity history]
Each layer of tephra (volcanic ash and pumice) that was erupted and deposited by Mount Fuji records the eruption like an ancient document. According to this, the first eruptions date back at least 80,000 years ago.

*Some of the terminology that mentions "tephra" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…それらをつなぐ道路も,東名高速道路(1968開通),中央高速道路(1968),富士宮有料道路(1966)などと連結して東京からの便がよくなり,富士の裾野は一連のレジャー用地へと変貌しつつある。【式 正英】
【火山活動史】
 富士山が噴出し堆積したテフラtephra(火山灰や軽石)の層の一枚一枚は古文書のように噴火の様子を記録している。それによると,噴火のはじまりは少なくとも今から8万年前の時代にさかのぼる。…

※「tephra」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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