September 6, 1420 Tsunami: Ibaraki, Japan

September 7, 1420 [Japanese standard time]. Tsunami struck Kawarago and Soga, Taga County, nine times for four hours. No quake. Validity 0, no tsunami, tsunami magnitude 1. (reference #150)

September 6, 1420. Nine waves were observed in 4 hours in Ibaraki Prefecture. Imamura estimates that the height of the waves was about 2 m. There is no reference at all to an earthquake, and it is considered that the tsunami came from a distant source. Validity = 3, tsunami intensity = 1. (reference #414)

Nine waves in 4 hrs. Imamura estimated height in order of 2m. No information on quake so tsunami assumed of distant origin. (reference #79)

AD1420 September 7 (August 29 in Julian Calendar, Ouei 27, VII 20) [Jinmei Kyo (Mirror of the God Jinmei) ] On the 20th of the month, from 6 to 10 AM, the sea withdrew nine times at Kawarago Aise (Aise fishery port, Hitachi city, Ibaraki Prefecture), and many fishes were washed up on land. [Consideration] No earthquake was felt, and this tsunami is also considered to be a distant tsunami. It is possible the source was the Chilean coast. (reference #11797)

The tsunami affected Kawarago and Aiga villages in Hitachi city, Ibaraki prefecture. Sea receded 9 times during 4 hours, exposing the coastal sea floor, and many fish were carried to the land. No description of earthquake ground shaking was found. (reference #12423)

September 6, 1420. Chilean earthquake. "Shinmei-Kyou,” a Japanese chronicle established in the 15th century, describes the drying up of the sea and is interpreted as a tsunami in the Ibaraki Prefecture by "Dai-Nihon Jishin-Shiryou” (1941). Tsuji (2013) speculated that this was a teletsunami resulting from an earthquake in Peru or Chile because the chronicle did not mention any ground shaking before the sea dryed up. However, "Shinmei-Kyou" only describes seismic events during and after 1420 near Kamakura; thus, obtaining a record of an earthquake is challenging even if there was significant seismic activity before the sea dried up. Therefore, it is erroneous to interpret that there was an earthquake in Peru or Chile on September 6, 1420, or that there was a teletsunami that struck the Ibaraki Prefecture on that date. [In Table 1, it is listed that] Both the earthquake and the tsunami are groundless. (reference #13561)

It is erroneous to interpret that there was an earthquake in Peru or Chile on September 6, 1420, or that there was a tele-tsunami that struck the Ibaraki Prefecture on that date. (reference #13536)

Note: tsunami source location listed for this event is unknown/uncertain.