Last September, scientists detected an unprecedented nine-day seismic vibration caused by a melting glacier in Greenland that triggered a massive landslide and a 650-foot mega-tsunami. The tsunami’s waves, trapped in a fjord, created a seiche, an oscillating standing wave, lasting for days. This event, linked to climate change, was so unusual that it initially led scientists to question their instruments. The findings, published in Science, involved a year-long international collaboration of 68 scientists.