Anomalous sea level

Japanese: 異常潮位 - いじょうちょうい（英語表記）anomaly sea level

Abnormal fluctuations in tide levels caused by changes in oceanographic and meteorological conditions. This refers to phenomena whose causes are unclear, except for those with clear causes such as tides, high tides, and tsunamis. Along the coast of Japan, deviations of about 10 cm from the predicted tide levels are common, but sometimes they can reach 20 to 40 cm. The most famous example is the phenomenon in early September 1971, when abnormal tide levels occurred on the Boso Peninsula immediately after a typhoon moved slowly east along the southern coast of Japan, moving westward at a speed of 2 to 5 meters per second with the land coast to the right. This caused flooding in many places and became a major social problem. Abnormal tide levels can last for more than a week.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

海象や気象の変動により起こる異常な潮位変動。潮汐や高潮，津波のように原因が明確なものを除き，発生原因の分かりにくい現象をいう。日本沿岸では予報潮位に対して 10cm程度の偏差は普通に起こるが，ときには，20～40cmに達することもある。最も有名な例は，1971年9月上旬に台風が日本南岸をゆっくり東進した直後，房総半島で異常潮位が起こり，秒速2～5mで陸岸を右に見るように西進した現象で，各地で浸水騒ぎが起き，大きな社会問題になった。異常潮位は長いときは1週間以上続くものもある。

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