Red line is the Sagami Trough
The Sagami Trough (相模トラフ Sagami Torafu) also Sagami Trench, Sagami Megathrust, or Sagami Subduction Zone is a 340-kilometre long trough, which is the surface expression of the convergent plate boundary where the Philippine Sea Plate is being subducted under the North American Plate. The Sagami Trough megathrust generated the 1703 Genroku earthquake, which was the greatest rupture along the trough in the last thousand years, and the 1855 (Ansei) and 1923 (Great Kanto or Taisho) earthquakes. It stretches from the Boso Triple Junction where it meets the Japan Trench to Sagami Bay, where it meets the Nankai Trough. It runs north of the Izu Islands chain and the Izu-Bonin-Mariana Arc (IBM). Earthquakes associated with the Sagami Trough are a threat to Tokyo and the Kanto Region because of the proximity to a population center (with over 36 million living in Tokyo's metro area, with a total of 43 million living in the Kanto Region) and the magnitude the Sagami Trough can create.
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