CATDAT records the following earthquake in late October, 1707. More than 29,000 houses in total wrecked and washed away and about 30,000 deaths.
Tsunami 25.7 m high at Kure, Kochi Prefecture.
In Tosa, 11,170 houses washed away and 18,441 persons drowned.
About 700 drowned and 603 houses washed away in Osaka.
20 m high at Tanezaki, Tosa, 6.58 at Muroto.
Hot springs at Yunomine, Sanji, Ryujin, Seto-Kanayana (Kii) and Dogo (Iyo,145 days) stopped. Kizumi described it as the largest earthquake in history.
This was an Ml8.6 earthquake (bigger than the 1854 earthquakes).
Less than 2 months later the following happened:
The last recorded eruption of Fuji was the HÅei eruption which started on December 16, 1707 and ended about January 1, 1708 (HÅei 4, 9th day of the 12th month) during the Edo period.
The eruption formed a new crater and a second peak (named HÅei-zan after the Hoei era) halfway down its side. Fuji spewed cinders and ash which fell like rain in Izu, Kai, Sagami, and Musashi.
Major earthquakes like the Sendai M9.1 earthquake, create massive stress transfer and MAY inadvertantly trigger other earthquakes on other faults or volcanoes. This MAY be the case in Japan this time.
Let us hope that this is not the case, and is most likely not, but care should be taken!