The deadliest earthquake was the 1923 Great Kantō earthquake, with 105,385 deaths, while the strongest and most costly earthquake on record is the 2011 Tōhoku earthquake (9.0 (Mw), $235 billion (2011)); this latter is also the most costly natural disaster to date globally.
The 1703 Genroku earthquake shook Edo and killed an estimated 2,300 people. The earthquake is thought to have been an interplate earthquake whose focal region extended from Sagami Bay to the tip of the Bōsō Peninsula as well as the area along the Sagami Trough in the open sea southeast of the Boso Peninsula. This earthquake then resulted in a tsunami which hit the coastal areas of the Boso Peninsula and Sagami Bay. This caused more than 6,500 deaths, particularly on the Boso Peninsula. The Habu Pond on Izu Ōshima collapsed and it rushed into the sea. The tsunami was reported to have caused more than 10,000 fatalities.[5]