黄石10月共定位66次地震、最大2.0级：火山口维持背景水平，Giant间歇泉一个月喷发三次
美国地质调查局（USGS）黄石火山观测站11月2日发布月度更新说，位于怀俄明州西北部、延伸至 Montana 州与 Idaho 州的黄石火山口，10月活动维持在背景水平，火山警戒级别为正常、航空颜色代码为绿色。
地震方面，负责黄石地震台网的犹他大学地震站10月在黄石地区共定位66次地震，全月没有出现震群。最大一次为2.0级，发生在10月4日下午5时32分，位置在黄石国家公园 West Thumb 以南约15英里。
地面形变方面，连续 GPS 站数据显示，过去几个月火山口及北缘没有明显的抬升或沉降，细微变化可能与地下水等季节因素有关。
热液活动则颇为热闹：园内第二高的 Giant 间歇泉10月5日、13日和22日共喷发三次；Norris 间歇泉盆地的 Echinus 间歇泉10月26日喷发；6月13日 Biscuit Basin 热液爆炸后塌陷形成的小热水池也至少出现两次小喷发。相比之下，Norris 的 Steamboat 间歇泉今年以来只有一次大喷发，其余时间以小喷发为主。
黄石火山观测站由 USGS、黄石国家公园、犹他大学、怀俄明大学、Montana 州立大学等机构共同参与，负责长期监测黄石地区的火山与地震活动，负责人是 Michael Poland。（来源：美国地质调查局）
Yellowstone Records 66 Earthquakes in October, Largest at Magnitude 2.0, as the Caldera Stays at Background Levels
Yellowstone Caldera activity remained at background levels in October, the U.S. Geological Survey's Yellowstone Volcano Observatory said in its monthly update on November 2, keeping the volcano alert level at Normal and the aviation color code at Green for the caldera, which sits mainly in northwestern Wyoming and extends into Montana and Idaho.
The University of Utah Seismograph Stations, which operates the Yellowstone Seismic Network, located 66 earthquakes in the Yellowstone National Park region during October, with no earthquake swarms identified. The largest event was a magnitude 2.0 micro earthquake on October 4 at 5:32 p.m. MDT, about 15 miles south of West Thumb in Yellowstone National Park.
Continuous GPS data showed little net deformation of the caldera or the north caldera rim over the past several months, with subtle variations probably caused by seasonal changes, especially in groundwater conditions.
Hydrothermal features were busier. Giant Geyser in the Upper Geyser Basin, the second tallest geyser in the park, erupted three times in October, on October 5, 13 and 22. Echinus Geyser in Norris Geyser Basin erupted on October 26, and the small hot pool that formed after the June 13 hydrothermal explosion in Biscuit Basin had at least two small eruptions. Steamboat Geyser in Norris, by contrast, was characterized by minor eruptions and has had only one major eruption so far in 2026.
The observatory, whose scientist-in-charge is Michael Poland, is a partnership of the USGS, Yellowstone National Park, the University of Utah, the University of Wyoming, Montana State University and other agencies, and provides long-term monitoring of volcanic and earthquake activity in the Yellowstone region. (Source: U.S. Geological Survey)
来源：美国地质调查局
发布：GSM·美国（发布链接）
图片来源：图：黄石国家公园的 Giant 间歇泉正在喷发。Wikimedia Commons 图片（CC BY-SA 2.0，John Manard）。 / Photo: Giant Geyser erupting in Yellowstone National Park. Image via Wikimedia Commons (CC BY-SA 2.0, John Manard).
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