Genroku Earthquake


October 23, 2021

The Genroku Earthquake (Japanese: 元禄地震 げんろクじshin[*]) was a major earthquake that occurred in the Kanto region of Japan on December 31, 1703 (November 23, Genroku 16) around 2 am. The epicenter is 139.8 degrees east longitude and 34.7 degrees north latitude in the sea area south of Cape Nojima, Chiba Prefecture in modern Japan, south of the Boso Peninsula, where the Sagami Gorge passes. The largest is estimated to be M7.9-8.5. It is also called the Genroku Earthquake (Japanese: 元禄大地震, Japanese: 元禄の大地震), and the Genroku Kanto Earthquake (Japanese: 元禄関東地震) is also used in preparation for the Great Taisho Kanto Earthquake. It is a trench-type earthquake similar to the Great Kanto Earthquake that occurred in 1923, and the seismic distribution is almost the same. The tectonic shift was much larger in the Genroku earthquake than in the 1923 earthquake. Due to a large-scale tectonic shift, the Minamiboso, the epicenter of the epicenter, raised the seafloor to create the Genroku Dangu (元禄段丘), and Cape Nojima was changed from a small island off the coast to a cape attached to the Japanese archipelago. It is also one of the great earthquakes and volcanic eruptions that occurred from the Genroku period to the Hoei period in the middle of the Edo period. In Hoei 4 (1707), four years after the Genroku earthquake, the Hoei earthquake with a magnitude of M8.4-8.6 (Mw8.7-9.3) and the Great Hoei eruption occurred when Mt. Fuji erupted.


On November 23, 16, Genroku, at Eulchuk-shi (about 2:00 a.m. on December 31, 1703 in the solar calendar in the modern chronology), a strong earthquake was felt in the Kanto region of Japan. In many ancient documents in Japan, it is often written as "the night of the 22nd" or "the night of the 22nd, 8th". It is a term that refers to “chuk-gak” the next day after midnight. In “The Year of the Evil Man” (楽只堂年録), written by Yanagisawa Yoshiyasu, it says, “In the Octagonal sutra, Yoshiyasu and Yoshisato rush into the castle due to an unprecedented great earthquake, but the waters of the Ote Moat It is said that the moat at the Ote Gate of Edo Castle overflowed. It is recorded that the water overflowed over this bridge. Shigeaki Asahi's diary, Shigeaki Asahi, who was on his way to the Owari Domain鸚鵡籠中記), "An earthquake occurred at the 2nd point of the axis. The earthquake was very violent. It returned to the earthquake." A long earthquake was felt in the Nagoya area, and aftershocks were recorded. In addition, there is a record that there was a luminescence phenomenon, such as the diary of Konoe Motohiro Konoe, a venerable magistrate, saying, "It shone bright enough to see a white light in the middle of the night" at the time of the earthquake. Also, in the Oritakushibanogi of Hakuseki Arai, who worshiped the Kofu Tokukawa family, he recorded an earthquake experience, saying, "On November 23, at the end of the 16th year of Genroku, the ground shook violently as if someone was passing by in the middle of the night." did. There is a record that a strong earthquake occurred in Bungo on the same day as the Genroku earthquake and at about the same time, causing great damage to Yufuin Onsen of the Funai Domain.

Progress in each place

The housing collapse damage was more in the coastal area of ​​Sagami Bay than in Edo, and the area estimated to have a seismic intensity of 7 is also concentrated in Sagami Bay and the southern part of the Boso Peninsula. The earthquakes of the Genroku earthquake were also felt in Mutsu and Kyoto.

Jinwon Station Discussion

Based on the fault model of the Great Kanto Earthquake of 1923, which included the Sagami Bay area as the epicenter, and the elevation of the southern tip of the Boso Peninsula, the entire Boso coastal area is also set as the epicenter. Also, the estimated progress distribution �

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