South-central Alaska and the Alaska
Range were severely shaken on the morning of 3 November 2003 by a M 7.9 earthquake. The shaking triggered a large rock and
ice avalanches on the Black Rapids Glacier. This rock fall originated from the
south walls of the glacier, crossed a medial moraine (~30 m high), and
continued across the entire glacier valley (> 2 km). The rock blanket covers
an estimated 13 km2 of the glacier�s ablation area. A very crude
estimate suggests that the total volume exceeds 10 Mio m3.
- Truffer, M., Craw, P., Trabant, D., March, R.: Effects of the M7.9 Denali Fault
Earthquake on glaciers in the Alaska Range. U.S. Geological Survey.