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Colloidal Pool over time
December 31, 2021

Colloidal Pool over time

Comparison of (a) 1904 Historical map with (b) 1988 USGS map. Colloidal Pool is a large, labeled pool roughly located on a straight line between Hurricane vent and Whirligig Geyser on the 1988 map (b); this same transect on the 1904 map (a) shows no feature at that location (white circle). Note: maps are not at the same scale or

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Scanning electron microscopy images of the Colloidal Pool colloids
December 31, 2021

Scanning electron microscopy images of the Colloidal Pool colloids

Scanning electron microscopy (SEM) images of the Colloidal Pool colloids (images are a combination of backscatter and secondary electrons). The colloids are a mixture of clay particles, hydrated silica, alunite, and diatoms. (a) Image shows how hydrated silica (the whispy, lighter colored precipitate) uses larger particles, such as dust, clay, or things like pine needles

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December 1, 2021

Yellowstone's ups and downs - Monthly Update for Dec 2021

Some people have characterized the seasonal rise and fall of Yellowstone as being like breathing. During the summer there is a little pause in the overall trend of subsidence and sometimes even a short episode of slight uplift. The trend reverses in early winter.

These summertime episodes are caused by groundwater recharge. As the snowmelt percolates into the

Regional map of southeastern Idaho showing Stanley earthquakes
November 16, 2021

Regional map of southeastern Idaho showing Stanley earthquakes

Regional map of southeastern Idaho showing the relative location of Yellowstone National Park and the Stanley earthquake aftershocks. Yellowstone National Park (outlined in yellow) is at least 275 km away from the 2020 Mw6.5 Stanley earthquake. Several active faults (in red) are located between the Stanley earthquake and Yellowstone Caldera.

Cumulative number of aftershocks greater than magnitude 2.5 following the 2020 magnitude 6.5 Stanley earthquake
November 16, 2021

Cumulative aftershocks >M2.5 following the Mar 30, 2020, Stanley, EQ

Cumulative number of aftershocks greater than magnitude 2.5 following the March 30, 2020, magnitude-6.5 Stanley earthquake in central Idaho. The black line shows the observed aftershocks, the red line shows the predicted number of aftershocks. Aftershocks are a normal and expected phenomenon following strong tectonic earthquakes.

November 1, 2021

November (2021) Yellowstone Volcano

The November 2021 YVO Yellowstone Volcano update comes to you from a very snowy Norris Geyser Basin with a story about Porkchop Geyser’s 1989 explosion.

Porkchop Geyser was named in the 1960s because it had a shape that looked a lot like a pork chop. In the 1970s to 1980s, it started having intermittent geyser eruptions, becoming more and more active. On September 5

Shaded relief map of Henrys Fork Caldera and vicinity
October 31, 2021

Shaded relief map of Henrys Fork Caldera and vicinity

Shaded relief map of Henrys Fork Caldera and vicinity. The margin of Henrys Fork Caldera is shown in blue. Note the smooth, low-relief topography within the caldera compared to the steep and dynamic topography associated with Yellowstone Caldera (at the right side of the image).

Thin section photo of Lava Creek Tuff “unit 2"
October 28, 2021

Thin section photo of Lava Creek Tuff “unit 2"

Microscope thin-section photo of Lava Creek Tuff “unit 2.” Photo by Ray Salazar (Montana State University) on October 28, 2021.

Vertical movement over time recorded at GPS station NRWY, 2005-2021
October 27, 2021

Vertical movement over time recorded at GPS station NRWY, 2005-2021

Vertical movement over time recorded at GPS station NRWY, near Norris Geyser Basin, during 2005-2021.

Satellite image showing area of Heart Mountain detachment slide block
October 26, 2021

Satellite image showing area of Heart Mountain detachment slide block

With the northwestern breakaway point near Silver Gate, MT, the Heart Mountain slide block moved southeast toward Cody, WY (orange arrow). Notable deposits of the debris avalanche include White Mountain, Heart Mountain, and the McCulloch Peaks.

View of White Mountain from the Sunlight Basin Road
October 26, 2021

View of White Mountain from the Sunlight Basin Road

A view of White Mountain -- a deposit of the Heart Mountain detachment -- from the Sunlight Basin Road in Wyoming. Much of the evidence supporting the lamprophyre diatreme triggering mechanism theory for the landslide was gathered at White Mountain.

Different views of an eruption from two predictable geysers
October 15, 2021

Different views of an eruption from two predictable geysers

Different views of an eruption from two predictable geysers. (a, c) Graphs showing water temperatures recorded by data loggers stationed near Beehive and Old Faithful Geysers, respectively. These data loggers were deployed by the Yellowstone Geology Program, configured to capture temperatures at one-minute intervals (indicated by blue dots). Significant upticks in

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