North Izu earthquake

An earthquake occurred at around 4:03 on November 26, 1930 (Showa 5) in the northern part of the Izu Peninsula. Its magnitude was 7.3. A swarm of earthquakes occurred off the coast of Ito from February to May of that year (3,915 earthquakes felt in Ito). The North Izu earthquake caused the Tanna Fault to appear, and a 2.7 meter lateral slip was found inside the Tanna Tunnel. Rumbling could be heard in Kinki and northern Kanto, far from Izu, and luminous phenomena were observed in various places from around 5pm on the evening before the earthquake. Damage was concentrated in the northern part of the Izu Peninsula, with approximately 272 deaths and approximately 2,150 houses completely destroyed.

[Usami Tatsuo]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

1930年（昭和5）11月26日4時03分ごろ、伊豆半島北部に発生した地震。規模はM7.3。この年2月から5月にかけて伊東沖では地震が群発（伊東における有感地震は3915回）した。北伊豆地震では丹那断層(たんなだんそう)が出現し、丹那トンネル内で2.7メートルの横ずれがみつかった。伊豆から遠く離れた近畿および北関東では地鳴りが聞こえ、また各地で、地震の前日の夕方5時ごろから発光現象が観察された。被害は伊豆半島北部に集中し、死者約272人、全壊家屋は約2150戸に達した。

［宇佐美龍夫］

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