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美国黄石国家公园(Yellowstone National Park)“汽船喷泉”(Steamboat Geyser)超越了往年喷发纪录，今年喷发47次，显示它进入了异常活跃期。

国家公园管理局(National Park Service)称，汽船喷泉是全球喷发高度最大的活喷泉，最高可喷发至300呎。“比灵斯日报”(Billings Gazette)报导，今年6月汽船喷泉才刚创下最短喷发间歇期纪录，两次喷发只间隔三天。

“今日美国报”(USA Today)报导，汽船喷泉曾在1911到1961年间大致沉寂；从2015到2017年完全没有喷发，却在2018年创下喷发32次的纪录。

火山学家珍妮克里普纳说，民众不必过度担心喷泉喷发次数增加是否与黄石“超级火山”。黄石间歇喷泉系统极佳，除了为它提供热能的岩浆系统之外，与其他岩浆活动无关。

全球自然间歇喷泉总共1000座，其中半数都位在黄石国家公园；国家公园管理局称，唯一曾喷发得比汽船喷泉高的，只有纽西兰的怀芒古喷泉(Waimangu)，但它已经逾100年没喷发了。