北大西洋中脊北部发生6.6级地震，USGS发布绿色警报
2026年3月21日，北大西洋中脊北部海域发生6.6级地震。美国地质调查局（USGS）事件页（事件编号 us6000si5l）记录，这次地震发生于协调世界时3月21日12时16分46秒，震源深度约10公里，震中位于北纬23.86度、西经45.80度的大西洋中部海底山脊地带，远离任何陆地。
USGS 的 PAGER 灾损评估系统对这次地震发布绿色警报，表示人员伤亡与经济损失的可能性低；震中周边400公里范围内没有重要的人口聚居区。太平洋海啸预警中心就这次地震发布了海啸信息公报，USGS 未报告人员伤亡或财产损失。
大西洋中脊是贯穿大西洋南北的海底山脉与板块边界，沿线地震多发生在远离陆地的海域。这次6.6级地震是当月全球较强的海底地震之一。
关联：汤加以西海域发生7.5级深源地震，为2026年以来全球最强地震
Magnitude 6.6 Earthquake Strikes Northern Mid-Atlantic Ridge, USGS Issues Green Alert
On March 21, 2026, a magnitude 6.6 earthquake struck the northern Mid-Atlantic Ridge in the North Atlantic Ocean. The U.S. Geological Survey (USGS) event page (event ID us6000si5l) recorded the quake at 12:16:46 UTC on March 21, at a depth of about 10 km, centered at 23.86 degrees north latitude and 45.80 degrees west longitude along the mid-ocean ridge, far from any land.
The USGS PAGER loss-estimation system issued a green alert for the earthquake, indicating a low likelihood of casualties and damage; there is no significant population center within 400 km of the epicenter. The Pacific Tsunami Warning Center issued a tsunami information bulletin for the event, and USGS reported no casualties or property damage.
The Mid-Atlantic Ridge is the submarine mountain range and plate boundary running the length of the Atlantic Ocean, and earthquakes along it mostly occur in waters far from land. At magnitude 6.6, this was one of the stronger undersea earthquakes worldwide that month.
Related: Magnitude 7.5 Deep Earthquake West of Tonga Is the Strongest Worldwide So Far in 2026
来源：美国地质调查局
发布：GSM·美国（发布链接）
图片来源：图：位于华盛顿的美国内政部主内政大楼外景，USGS 隶属内政部，这次北大西洋中脊6.6级地震由该局测定发布。ajay_suresh 摄，CC BY 4.0，经 Wikimedia Commons。 / Photo: The U.S. Department of the Interior's Main Interior Building in Washington; the USGS, which measured and reported this magnitude 6.6 Mid-Atlantic Ridge earthquake, is part of the Interior Department. Photo by ajay_suresh, CC BY 4.0, via Wikimedia Commons.
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