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Pavlof reported activity





Event Name : Pavlof 1914/7

Start:July 6, 1914 ± 1 DaysObserved
Stop:October 16, 1914 ± 3 MonthsObserved

Tephrafall: BibCard BibCard BibCard
Minor explosive eruption: BibCard
Eruption Type:Explosive
MaxVEI: 2 BibCard

Description: This eruption was recorded in the log book of the US Coast and Geodetic Survey Patterson's log book. On July 6, 1914, the log book records: 'At 12:18 a distant rumbling, which some on deck took for thunder was heard. It came from a direction between W and WNW (mag) and lasted longer than thunder and sounded like a landslide with many distinct explosions and a minute later two separate explosions were heard, though faintly. At 12:30 more rumbling was heard although at this time it sounded more like thunder and seemed to be from a source higher above the horizon. At 12:30 the fog suddenly disappeared - it was flat calm and a dark blue black cloud was seen to the westward. Notified the Commanding Officers that there was probably a volcanic explosion and by this time some solid particles in the atmosphere could be felt by the eyes and soon it began to collect on the deck. A light SW-SSW breeze now sprang up and the cloud spread to the northward. Peals of thunder were heard - though not very loud - at intervals about 10 mins and at 1:30 some lighning was noticed. The cloud now spread to the southward and at 1:30 it was so dark that it was necessary to start the dyanamo. The decks were covered by 2 o'clock with a fine black dust and it was very difficult to look into the wind as it bothered the eyes so much. At 2:30 it began to brighten to the northward and soon became normal - mist to the northward with the black cloud passing over Unga and Popof Islands. At 2:05 dropped the dory - Dr. Edson left ship to answer call of SS Windber. Dory returned with the captain of the Windber. Ship lay to. 3:05 Dory returned with Dr. Edson - hoisted dory and at 3:15 squared on course ENE with the "Windber" following. 5:40 Overtook the cloud hanging over Popof and another light shower of volcanic ash was experienced at 5:30. Light SW breezes." Images of these log book pages are visible at the following URLs: http://oldweather.s3.amazonaws.com/ow3/final/USCS%20Patterson/Book%2016/IMG_6579_0.jpg and http://oldweather.s3.amazonaws.com/ow3/final/USCS%20Patterson/Book%2016/IMG_6579_1.jpg . Ther e are also transcripts from the Old Weather project: http://forum.oldweather.org/index.php?topic=384.msg74647#msg74647 .

Sapper (1917) writes that on July 5 or 6 [1914], during the night or at 6 am, there was the beginning of an eruption. There were light explosions from 12:18 to 3 pm, and loud detonations could be heard at Corvin [Unga] Island (10 to 30 minutes apart. "Stronger ashfalls."

The eruption was still evident when the steamer Dirigo passed by Pavlof on July 10, 1914: "Pavlof volcano, on the Alaska peninsula, west of the Shumagin island 100 miles off Mount Shishaldin, was also active when the Dirigo passed. The action of Pavlof was peculiar, the mountain throwing out a black ash, a light fall of which was noticed on the Dirigo" (Associated Press, 1914).

On Friday, October 16, 1914, the US Coast and Geodetic Survey's Patterson vessel again noted eruptive activity from Pavlof: "Pavlof volcano was seen in active eruption - dense volumes of smoke and flame reaching several thousand feet above the crater were seen. No noise could be heard and only a very slight trace of ashes could be detected." (see log book images here: http://oldweather.s3.amazonaws.com/ow3/final/USCS%20Patterson/Book%2017/IMG_6692_1.jpg and http://oldweather.s3.amazonaws.com/ow3/final/USCS%20Patterson/Book%2017/IMG_6692_0.jpg )

The United States Commissioner at Unga gave T.A. Jaggar black sand that fell at Unga from Pavlof during a July 6, 1914 eruption (Kennedy and Waldron, 1955). Coats (1955) start date of July 15, 1914 is certainly too late for the beginning of the eruption.

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Page modified: March 30, 2017 14:36
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