23rd day of the 11th month of the 4th year no relation Mount Hōei
The Hōei eruption of Mount Fuji started on December 16, 1707 (during the Hōei era, 23rd day of the 11th month of the 4th year) and ended on February 24, 1708.  It was the last confirmed eruption of Mount Fuji, with three unconfirmed eruptions reported from 1708 to 1854. It is well known for the immense ash-fall it produced over eastern Japan, and subsequent landslides and starvation across the country. Hokusai's One Hundred Views of Mount Fuji includes an image of the small crater at a secondary eruption site on the southwestern slope. The area where the eruption occurred is called Mount Hōei because it occurred in the fourth year of the Hōei era. Today, the crater of the main eruption can be visited from the Fujinomiya or Gotemba Trails on Mount Fuji.Tectonic setting and the threat of more eruptions
Japan is located in the most geologically active region of Earth, called The Ring of Fire. This region is known for its many volcanic eruptions and earthquakes. The location of Mount Fuji puts it in the middle of three colliding tectonic plates, the Eurasian, North American, and Philippine Sea plate, resulting in the history of high geologic activity. The Hōei eruption was preceded by a magnitude 8.6 earthquake, just 49 days before the eruption. Many volcanologists believe that this earthquake was likely the cause of the eruption.Based on the internal pressure inside the volcano that scientists measured in 2012, speculation of a possible eruption is high. There have been many earthquakes since the 1707 Hōei earthquake, with some minor activity in the 1980s, in the year 2000 and 2001, and the major Tohoku earthquake in 2011. After the activity observed in 2000, magma has been found to be collecting under the volcano. Damage is estimated to cost Japan over US$25 billion if another eruption were to occur. It is assumed that, much like the 1707 Hōei eruption, the volcano would almost certainly erupt at the same vent where the previous eruption occurred. A repeat of the 1707 Hōei eruption is also said to impact over 30 million people in the highly populated areas of eastern Tokyo, Kanagawa, Chiba and parts of Yamanashi, Saitama, and Shizuoka. The volcano would most heavily affect Tokyo, and would likely cause power outages, water shortages, and malfunctions in the highly technical city. Mount Fuji has more than 20 seismic activity stations monitoring any movement in the ground. It is impossible to determine when the next eruption will occur, but it will most likely erupt soon due to the long dormancy time.
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