David Ruffner<p>There was a megatsunami in Lituya Bay in 1958, <a href="https://en.m.wikipedia.org/wiki/1958_Lituya_Bay_earthquake_and_megatsunami" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.m.wikipedia.org/wiki/1958_L</span><span class="invisible">ituya_Bay_earthquake_and_megatsunami</span></a> . An earthquake caused a massive rockfall into a bay. The impact with the water generated a massive wave with a run up of 520m on the opposing slope. It was a shockingly powerful wave!</p><p>It turns out this kind of event is a risk in high latitude mountainous coastlines. The glaciers create steep valleys with fjords. The steep slopes have a high rockfall risk. In Norway, they are doing a mapping program to give warning before such disasters <a href="https://www.earthmagazine.org/article/comment-assessing-threat-massive-rock-slope-failures-norwegian-fjordlands" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">earthmagazine.org/article/comm</span><span class="invisible">ent-assessing-threat-massive-rock-slope-failures-norwegian-fjordlands</span></a></p><p><a href="https://raphus.social/tags/TIL" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>TIL</span></a><br><a href="https://raphus.social/tags/megatsunami" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>megatsunami</span></a><br><a href="https://raphus.social/tags/tsunami" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>tsunami</span></a><br><a href="https://raphus.social/tags/rockfall" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rockfall</span></a></p>