Overview
- Seismic records and drone imagery indicate the main collapse occurred at about 6:57 a.m. on 22 September and that many smaller, continuing falls produced dust plumes through the day.
- Researchers mapped an roughly 4,000 square‑metre detachment on the north face at about 2,800 metres elevation on an approximately 80‑degree slope and found much debris remained on ledges rather than reaching the valley.
- Published volume estimates conflict: one TUM analysis described about 13,800 cubic metres of rock lost while a separate TUM team led by Prof. Michael Krautblatter reported around 3,800 cubic metres, and scientists are re‑evaluating data to reconcile the difference.
- Teams point to thawing permafrost as a likely contributor, noting that heat from this summer can take months to penetrate into rock and that temperature logs in a nearby tunnel rose from about −1.2°C to −0.7°C since 2007.
- Authorities will increase monitoring with fixed laser scanners and continued seismic and in‑situ temperature measurements to detect small precursors, sharpen hazard assessments and give climbers clearer short‑term safety guidance.