北海道千岛海沟告急！NHK：或有9级地震 27米海啸
311东日本大地震十四周年之际，日本（Japan）再次敲响警钟。北海道（Hokkaido）外海的千岛海沟，或将酝酿一场里氏9级大地震？一场可能引发27米巨浪的海啸，正威胁着沿岸地区？https://wsrv.nl/?url=https://cdn.hk01.com/di/media/images/dw/20250310/975750005535019008581906.jpeg/Gx8Ps3UoEr172oO4Xp8K977laNWYtNzOjg2zPI4Nszw
日本广播协会（NHK）报道，由东北大学和北海道大学等机构组成的研究团队，自2019年起持续观测千岛海沟的海底地壳变动。通过在海底设置GPS观测点，研究团队发现，海洋板块的观测点每年大约向陆地侧移动8厘米。放置在海洋板块开始隐没区域的观测点，同样每年约向陆地板块移动8厘米。这表明海洋板块和陆地板块之间存在非常紧密结合的部分，并且持续积累应力。专家指出，积累的应力足以引发里氏9级的大地震，呼吁民众做好防震和防海啸的准备。研究团队截至2024年的观测结果显示，海洋板块和陆地板块之间存在非常紧密结合的部分，并且持续积累应力。
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日本政府专家小组近日也发出警告，北海道千岛海沟可能爆发9级大地震。事实上，北海道外海的千岛海沟附近，17世纪曾发生过大地震，距今已超过400年。日本政府地震调查委员会已将千岛海沟30年内发生里氏8.8级以上强震的概率从7%上调至40%。根据2021年的推测，该地区发生强震可能引发超过20米的海啸，导致10万人丧生。
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千岛海沟：位于西北太平洋地区，是太平洋板块向北美板块俯冲的地区，也是一个地震多发带。由于板块之间的相互作用，千岛海沟附近经常发生地震和海啸。
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