Geological activity in the United States has continued to present a varied and dynamic picture in the past week. In Yellowstone National Park, the United States Geological Survey reports that volcanic and seismic activity remains at background levels. There were eighty-seven located earthquakes in September, with the largest being a magnitude three point three event fourteen miles south-southwest of Mammoth Hot Springs. Notably, the usually active Steamboat Geyser has had only two major eruptions in twenty twenty-five, indicating a downturn from the period of frequent activity that began in twenty eighteen. Valentine and Guardian Geysers have shown intermittent eruptions, with Valentine erupting for the first time in over twenty years. A new steam vent also opened in the Mud Volcano area, a site familiar with such events. GPS monitoring in the region continues to show seasonal uplift due to snowmelt and groundwater changes, but the area overall maintains its long-term trend of subtle subsidence according to ongoing measurements by EarthScope Consortium and USGS field engineers.
In Alaska, the Alaska Earthquake Center reports a magnitude two point two earthquake occurring southeast of Girdwood on the night of October thirty-first. The earthquake’s depth was about six miles, and while minor, it reminds researchers of the persistent tectonic activity in Southcentral Alaska driven by the subducting plate boundary that has historically produced much stronger quakes in the region.
Hawaii remains an active center for volcanology. According to the Hawaiian Volcano Observatory, the Kilauea volcano recently concluded episode thirty-five of its Halemaumau eruption with seven and a half hours of lava fountaining. Both active vents continue to show incandescence and summit inflation is ongoing, with seismic tremor and gas emissions in the normal range. Eruption models suggest another episode is likely in the window between November fourth and eighth, with the largest fountains in the most recent episode reaching heights of up to one thousand five hundred feet. This ongoing volcanic activity produces significant lava flows, which now cover about two thirds of the crater floor.
Beyond the United States, global geological attention has been focused on marginal seas as highlighted by the recent International Conference on Marine Geology in Guangzhou, China. Experts there discussed the rising impact of sea level changes and coastal management challenges in the face of climate change and rapid urbanization. Meanwhile, October sixth marked International Geodiversity Day worldwide, with events ranging from public walks in Luxembourg’s UNESCO Global Geopark to digital celebrations promoting awareness about the importance of geological variety for environmental resilience. According to recent findings published by ScienceDaily, researchers have also observed a subduction zone actively breaking apart beneath the Pacific Northwest, providing new insight into the forces shaping the continent’s edge and the risk of future major earthquakes. This combination of monitoring, research, and global collaboration underscores the vital role geology plays in helping us understand and adapt to our changing planet.
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