Yellowstone National Park has seen increased, but still background, seismic activity over the past month. According to the US Geological Survey, scientists recorded 180 earthquakes in October, with the strongest reaching magnitude three point seven near Mammoth Hot Springs on October twenty eighth. Four earthquake swarms were detected throughout the park, but none suggest heightened volcanic risk. Ground deformation measurements show the end of seasonal uplift, with long-term subsidence of the caldera, a pattern ongoing since twenty fifteen, resuming as winter approaches. Minor eruptions of the Steamboat Geyser remain infrequent, indicating a decline in the geyser’s cycle of heightened activity since twenty eighteen, with only two major eruptions recorded so far this year. Other geysers like Valentine and Guardian continue sporadic eruptions, which is considered normal for the region.
Nevada experienced a significant earthquake last Saturday, when a magnitude five point three event struck at a shallow depth of about three point seven miles. According to the United States Geological Survey, this is part of a recent surge in seismic activity in the Basin and Range Province. NASA geologists note that this region is characterized by an expanding and thinning crust, causing frequent earthquakes along hundreds of faults over millions of years. Shallow earthquakes like the one in Nevada are generally felt more strongly at the surface. This pattern highlights why the Basin and Range region is considered one of the most seismically active in the United States.
Moving west, California remains stable on the volcanic front. The California Volcano Observatory reports that monitored volcanoes, including Mount Shasta, Medicine Lake, and Lassen, are all at normal alert levels. Earthquake activity is limited to typical patterns, such as the one hundred and eleven minor earthquakes recorded in the Geysers geothermal area, with the largest registering magnitude three point two.
In Alaska, the Great Sitkin Volcano continues to erupt lava within its summit crater. The Alaska Volcano Observatory notes low seismicity in recent days, with no major explosions recorded since May twenty twenty-one, although monitoring for renewed unrest continues.
Hawaii’s Kilauea Volcano remains active. The volcano’s summit is inflating, and sulfur dioxide gas emissions are at background levels. In October, lava fountains during eruption episode thirty-five reached heights of nearly fifteen hundred feet and produced approximately thirteen million cubic yards of lava, covering about two thirds of Halemaʻumaʻu crater’s floor.
Globally, significant volcanic activity was noted at Ecuador’s Reventador volcano, which is emitting ash plumes, and at several volcanoes in Central America and Indonesia, according to Volcano Discovery. In the United States, however, recent geological events point to ongoing but expected levels of seismic and volcanic activity, with no indications of imminent major eruptions or catastrophic earthquakes at this time.
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