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Cleveland reported activity





Event Name : Cleveland 2001/2

Start:February 2, 2001 Observed
Stop:April 15, 2001 Observed

Lava flow: BibCard BibCard BibCard BibCard
Tephrafall: BibCard BibCard BibCard
Tephra plume: BibCard BibCard BibCard BibCard BibCard
Central eruption: BibCard BibCard BibCard BibCard
Eruption Type:Explosive
Duration: About 2 and a half months BibCard
Eruption Product: basaltic andesite BibCard
MaxVEI: 3 BibCard
ColHeight: 12000 m BibCard

Description: From Dean and others (2002): "Mt. Cleveland erupted explosively on 19 February and on 11 and 19 March 2001.

* * * "The first indication to AVO of activity at Mt. Cleveland was the 19 February eruption. However, after the eruption, AVO received reports indicating that precursory activity had taken place. Most graphic was a photograph taken on 2 February by a pilot flying by the volcano showing a dark, lobate deposit on the snow-covered southwest flank and robust steaming from the summit crater. During this same period, residents of Nikolski observed steaming at the summit and snowmelt on the flanks of the cone.

"On 19 February, Mt. Cleveland erupted explosively at approximately 1430 UT. Pilot reports indicate that the altitude of the plume increased with time from 7.5 km a few hours after the start of the eruption, and up to 12 km eight hours later. The eruption cloud and a thermal anomaly were detected on AVHRR satellite data at 1655 UTC. The plume was complex and extended in two directions, 40 km northwest and 60 km southeast of the volcano.

* * * "By 21 February (0300 UT), 35 hours after the eruption, the ash cloud was over 1000 km long and extended from Cook Inlet, Alaska, to Chukotsk Peninsula, Russia. Eventually this long, arcing cloud split into three segments that drifted north over the Arctic Ocean, over Fairbanks near the center of the state, and south into the Gulf of Alaska.

* * * "Mt. Cleveland erupted again on 11 March. This explosive eruption lasted 3 hours (1400 to 1700 UT) based on satellite observations, with an estimated cloud height of 8 km.

* * * "The 19 March eruption lasted up to 6 hours (2330-0530 UT), with an estimated cloud height of up to 9 km according to the National Weather Service.

* * * "Throughout March and April, elevated surface temperatures and low altitude ash clouds were periodically observed on satellite data. Ground and air observers noticed minor ash clouds over the volcano during the same period.

* * * "Despite the extensive area traversed by the February plume, ash fall was observed only at Nikolski over a period of approximately 5 hours on 19 February. Residents reported that the ash fall occurred under a hazy sky and consisted of a very light dusting of fine-grained material. School children in Nikolski were given paper masks to wear home and residents were advised to stay indoors. No injuries or health impacts have been reported; one resident noted that breathing outside without a mask 'made you want to cough.'

"A sample from Nikolski shows that the ash is composed of glass shards, crystals, and lithics. * * * The glass is dacitic and has a magmatic morphology rather than phreatomagmatic."

Smith (2005), estimates a total erupted volume of deposits (not including tephra) from January through late March 2001 as 1.12 x10^6 cubic meters (+/- 3.07x10^5 cubic meters).

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Page modified: March 30, 2017 14:36
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