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On August 10, 2025, a mountainside collapsed into Tracy Arm Fjord in Southeast Alaska, generating a 481-meter tsunami — the second-tallest ever recorded and the largest not triggered by an earthquake. A new study published in Science links the event to glacial retreat driven by climate change, while revealing that seismic precursors detectable days before the collapse went unmonitored, raising urgent questions about hazard detection in Alaska's cruise-ship-frequented fjords.