File:Fan Geyser & Mortar Geyser (evening, 8 August 2017).jpg
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| Description |
English: Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano (northwestern Wyoming, USA).
Fan Geyser is a major feature in the Morning Glory Group of Yellowstone’s Upper Geyser Basin. It is located on the northeastern bank of the Firehole River, just downstream from Mortar Geyser. Fan Geyser consists of a series of vents oriented along a northeast-southwest fracture zone that goes through nearby Spiteful Geyser. From southwest to northeast, the principal vents of Fan Geyser are: River Vent, High Vent, Gold Vent, Angle Vent, Main Vent, and East Vent. Eruptive activity at Fan Geyser currently takes several forms: "garbage", regular cycles, event cycles, and (major) eruptions. "Garbage" refers to disorganized low spouting from Fan's various vents. Regular cycles involve organized low spouting and splashing that starts with River Vent, progresses to High Vent and Gold Vent, and continues to Angle Vent. Eventually, the low spouting ends. Event cycles are characterized by slightly more unusual activity, including one or more pauses and resumptions in River Vent’s erupting, more energetic and higher spouting from High Vent, Gold Vent, and Angle Vent, and small splashing in the Main Vent. Major eruptions of Fan Geyser are almost always in concert with nearby Mortar Geyser (there have been exceptions in the past). Eruptions occur after an energetic event cycle and involve high spouting from East Vent, Main Vent, and all other vents. Eruption columns extend in various directions, resulting in a fan-like spray. Spouting often reaches the trail or past the trail. Eruptions are about 30 to 40 minutes in duration, and include one or more relatively brief pauses. See a major eruption here: www.youtube.com/watch?v=dqqb0EG5ODE#t=12m40s The geyser in the lower left foreground is Mortar Geyser. Fan Geyser is in the right near-background. The watercourse from lower left to far-right is the Firehole River. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/35820250694/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/35820250694. It was reviewed on 13 December 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:24, 13 December 2022 | | 4,000 × 1,824 (3.49 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/35820250694/ with UploadWizard |
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