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Westdahl reported activity




Event Name : Westdahl 1979/2

This is a questionable event.

Start:February 8, 1979 Observed
Stop:February 9, 1979 Observed

Active; type of activity not specified: BibCard BibCard
Tephra plume: BibCard BibCard BibCard BibCard
Eruption Type:Other
ColHeight: 8000 m BibCard
MaxVEI: 3 BibCard
Duration: about 2 days BibCard

Description: From Pamenter and Kienle (1981): "Ash cloud about 8 km high. "A cloud apparently erupted from Westdahl was present on NOAA weather satellite imagery for more than 30 hours on 8 and 9 February. The cloud was first observed on an infrared image taken at 03:52 on 8 February, about 17 hours after the previous image, on which no eruption cloud could be seen. It occurred on 08:42 and 10:37 (infrared) but was not present at 19:58 on the 9th of 09:52 on the 10th. The cloud was no more than 50 km in longest dimension on any of the images, nor was it elongated into a typical volcanic plume. The height of the cloud was calculated separately from infrared and visual images taken at 09:26 on 8 February. Analysis of the infrared image gives a temperature of -53 degrees C at the top of the cloud, corresponding to an altitude of slightly more than 8 km. On the visual image, measurements of the shadow cast on the weather cloud deck by the volcanic cloud results in an estimated altitude of 7.7 +/- 1 km (Data from SEAN Bulletin, vol. 4, p. 2-3, 1979)."

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