redoubt reported activity

Event Name : Redoubt 1966/1

Start:	January 24, 1966	Observed
Stop:	April 28, 1968	Observed

Tephrafall:
Lahar, debris-flow, or mudflow:
Glacier outburst flood:
Tephra plume:
Central eruption:
Phreatic:
"Fire", "Glowing", or incandescence:

Eruption Type:	Explosive
Eruption Product:	andesite
MaxVEI:	3
ColHeight:	13000 m
Chem	Yes
Other	mafic

Description: From Till and others (1993): "[O]n January 24, 1966, Redoubt erupted. 'Giant black puffs' of tephra rising 6,000 m above the summit were reported (Anchorage Daily News, January 25, 1966). A 22-man seismic crew camping and working along the lower Drift River was evacuated following flooding of the river as a result of the eruption. According to their account (Anchorage Daily News, January 26, 1966), the ice-bound river broke up suddenly and water rose 1 to 1.2 m in 15 minutes, carrying chunks of ice 'the size of a D-7 cat'. The flood crested and returned to normal within about 30 minutes. During this flood, boulders with mean diameters of 1 to 2 m were deposited within approximately 3 to 5 km of the volcano. Other smaller floods occurred through February and March (Sturm and others, 1986).

"Infrasonic waves attributed to explosive eruptions of Redoubt were recorded 550 kilometers away at College, Alaska, during two periods: six explosions from January 24 to February 20, 1966, and five explosions from December 7, 1967, to April 28, 1968 (Wilson and Forbes, 1969)."

"* * * Sturm and others (1986), in a study of long-term effects of the eruptions on the Drift glacier that drains the summit crater, estimated that 60,000,000 cubic m (0.6 cubic km) of ice were 'blasted, melted, scoured, or washed away by the cumulative events of 1966-68.' When parts of the glacier that were separated by the eruption reconnected, a dramatic thickening of the lower glacier occurred and the surface speed increased by a factor of ten. This surge apparently culminated in 1986 without causing a damming of the Drift River."