The retreat of an Alaskan glacier in the Barry Arm fjord, caused by rising temperatures, has left a steep and hefty land mass without structural support. If the hillside collapses in a landslide, millions of tons of rock and soil will plummet into the waters below, generating a wave of water hundreds of feet tall, endangering nearby coastal towns. Perhaps even more troubling, scientists cannot predict the timing of the collapse and resulting tsunami with certainty, making preparation difficult.
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Source: Phys.org