The U.S. Geological Survey in its typical way of downplaying geological conditions reported on November 1, 2021 that subsidence of Yellowstone Caldera has been ongoing since 2015, but that deformation typically pauses or turns to slight uplift during the summer months due to seasonal groundwater recharge. The summer pause in 2021 appears to have continued into October, with little overall caldera deformation since June.
A GPS station near Norris Geyser Basin is now showing signs of uplift—the station has risen by about 1.5 cm (less than 1 in) over the past few months. It is as yet unclear if this is a seasonal signal or related to magmatic or hydrothermal processes at depth. The Norris GPS site typically does not record seasonal variations like those that are common in the caldera, so this may indicate a return to uplift of the area, which also occurred during 2013-2014 and 2015-2018 due to accumulation of hydrothermal fluids within a few kilometers of the surface.
An example of GPS data can be found at http://www.unavco.org/instrumentation/networks/status/pbo/data/NRWY
The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
A National Geographic video: https://www.youtube.com/watch?v=7OMxBlK46wY
A video on potential eruption at Yellowstone: https://www.youtube.com/watch?v=RqrrWejHHeI
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