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Gray Bulger Geyser time lapse (afternoon, 12 June 2018)

Gray Bulger Geyser time lapse (afternoon, 12 June 2018)

Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is in the Yellowstone Hotspot Volcano (northwestern Wyoming, USA).

Gray Bulger Geyser is a cluster of vents near the southern shore of Firehole Lake in the Black Warrior Group of Yellowstone’s Lower Geyser Basin. Over half a dozen active vents occur at & adjacent to the head of a somewhat J-shaped hot spring pool (vicinity of 44° 32’ 38.44” North latitude, 110° 47’ 04.01” West longitude). Some of these vents have been referred to as “Young Hopeful Geyser”, but Gryc (2016) demonstrated that Young Hopeful Geyser is a vent (now apparently inactive) just off the end of the hook of the J-shaped pool (at 44° 32’ 38.48” North latitude, 110° 47’ 04.22” West longitude). The most prominent erupting feature in the Gray Bulger Geyser complex is vent 3 of Gryc (2016). In 2014 and 2015, observed eruptions from vent 3 were two to four minutes long with intervals of six to eight minutes (“interval” = eruption start to eruption start).

When observed in June 2018 (see this time lapse video), Gray Bulger was erupting from six active vents, but at any one time, four or five or six would be actually erupting. Vent numbers 4, 5, and 6 of Gryc (2016) erupted continuously - vent 5 was the most energetic; vent 6 slightly less so; vent 4 was lightly splashing. Dominant spouting alternated between vent 3, vent 1, and another vent not present on Gryc's sketch map (located a little east of vent 3). The "other" vent had periodic eruptions every few minutes and occasionally shut down vent 3 activity. When vent 3 re-activated, spouting was initially about twice normal height.
Reference cited:
Gryc, S. 2016 (dated 2015). Firehole Lake geyser delights (but which geyser is it?). Geyser Gazer Sput 29(6): 5-8.
This time lapse video is also posted at:

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Photo taken on 19 July 2019 (© James St. John / Flickr)

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 gray, bulger, geyser, geysers, eruption, eruptions, lower, basin, yellowstone, wyoming, video, black, warrior, group, time, lapse

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