『Yellowstone Volcano Remains Stable, Utah Faults Revealed, and Induced Seismicity Trends Highlighted in Geologic Roundup』のカバーアート

Yellowstone Volcano Remains Stable, Utah Faults Revealed, and Induced Seismicity Trends Highlighted in Geologic Roundup

Yellowstone Volcano Remains Stable, Utah Faults Revealed, and Induced Seismicity Trends Highlighted in Geologic Roundup

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 In early January 2026, the United States Geological Survey released its Yellowstone Volcano Observatory monthly update, highlighting ongoing geological activity in Yellowstone National Park, Wyoming. Yellowstone Caldera remains at normal alert levels, with 79 located earthquakes in December 2025, the largest measuring magnitude 2.7. Subtle uplift of two to three centimeters along the north caldera rim, south of Norris Geyser Basin, began in July 2025 and continues, resembling patterns from 1996 to 2004, according to continuous GPS and satellite radar measurements by the USGS. Within the caldera, long-term subsidence since 2015 paused, with up to two centimeters of uplift since May 2025, possibly signaling a shift from subsidence or an extended seasonal effect.

Hydrothermal features dominated 2025's top stories, per the USGS Yellowstone monthly update for January 2026. Black Diamond Pool in Biscuit Basin saw at least three small eruptions on December 8, 18, and 20, 2025, captured by new camera and infrasound monitoring following a 2024 explosion. Steamboat Geyser in Norris Geyser Basin, the world's tallest active geyser, erupted for the third time in 2025 on December 31 just after 10 p.m. Mountain Standard Time, marking a decline from prior active phases.

Elsewhere in the US, the Utah Geological Survey announced on January 5, 2026, new high-resolution maps revealing active faults in central Utah's rural areas. These faults, which have ruptured the surface within the past 2.6 million years, highlight growing earthquake risks amid rapid development beyond the Wasatch Front.

A USGS report notes human-induced earthquakes from oil and gas operations have reshaped seismic patterns nationwide, increasing tremors in regions like Oklahoma and Texas. High Country News's January 2026 issue explores deep geologic time in the West, linking ancient events like the Arizona Meteor Crater asteroid impact to Grand Canyon formation and plate tectonics insights from scientist Tanya Atwater on the San Andreas Fault in California.

These developments underscore Yellowstone's dynamic hydrothermal and seismic baseline, emerging fault clarity in Utah, and induced seismicity trends, with no signs of escalation beyond normal variability. Globally, a massive hydrothermal field off Greece stunned scientists in late December 2025, but US patterns emphasize steady monitoring amid human influences.

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