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アメリカ旅行(大隕石のクレーター)

木曾の紅葉で中断していたアメリカ旅行の続きです。10月15日,これはモニュメントバレーへむかう途中で寄った隕石衝突による大クレーターです。周囲約4.8キロ,深さ約170メートルの巨大クレーターです。アリゾナの砂漠のようなところにあります。この隕石は50000年前に衝突したものですが,約50ートルの直径のものだったと想定されています。衝突時には大気圏でもえるのではるかに小さくなって(例えば10メートル程)いたのでしょうが衝突のエネルギーの凄さがわかります。いつまた衝突があるか分かりません。この大きさの隕石が人口密集地帯に衝突したら数百万の人が犠牲になるだろうといわれています。人間の存在は自然の一部で小さいものと認識させられました。

051112-04

051112-05


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