Mysterious 9-day seismic event was caused by a mega tsunami bouncing around inside a fjord, study reveals Livescience.comScientists have solved the mystery of a 650-foot mega-tsunami that made the Earth vibrate for 9 days CNNA rumble echoed around the world for nine days. Here’s what caused it. The Washington PostEntire Earth vibrated for nine days after climate-triggered mega-tsunami The GuardianWe Now Know Why Earth Vibrated for Nine Days in 2023 The Wall Street Journal