A Landslide in Alaska Set Off a Tsunami. There May Be More to Come.
Nearly 500 feet up a near-vertical rock face, scraped clean of soil and alder trees, Bretwood Higman, a geologist, looked down across the Tracy Arm fjord in southeast Alaska at a scene of devastation. At 5:26 a.m. on Aug. 10 last year, a mass of rock with a volume 24 times larger than that of…