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In December 1991, 11.8 ± 2.4 × 106 m3 of rock and ice fell from Mount Cook (3754 m), the highest peak in New Zealand's Southern Alps. It fell 2720 m in 2 min and traveled 7.5 km (averaging 60 m/s). It generated a magnitude (ML) 3.9 earthquake, becoming finely comminuted and doubling in mass through erosion.

In December 1991, rockfalls began at Mount Fletcher (2467 m) 30 km northwest of Mount Cook. They continued until the ridge north of Mount Fletcher fell in rock avalanches in May and September 1992. They dropped 1440 m...

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