Sagami Trough
The also Sagami Trench, Sagami Megathrust, or Sagami Subduction Zone is a long trough, which is the surface expression of the convergent plate boundary where the Philippine Sea Plate is being subducted under the Okhotsk Plate. It stretches from the Boso Triple Junction in the east, where it meets the Japan Trench, to Sagami Bay in the west, where it meets the Nankai Trough. It runs north of the Izu Islands chain and the Izu–Bonin–Mariana Arc (IBM).

Megathrust earthquakes associated with the Sagami Trough, known as Kantō earthquakes, are a major threat to Tokyo and the Kantō 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.
Q727990
Megathrust
Concept
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trough
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Q1255282
convergent plate boundary
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Q339748
Philippine Sea Plate
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Q176318
subducted
Concept
Q1139220
Okhotsk Plate
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Q3183522
Boso Triple Junction
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Q118537
Japan Trench
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Q1061221
Sagami Bay
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Q3249284
Nankai Trough
MISC
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Izu Islands
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Izu–Bonin–Mariana Arc
LOC
Q727990
Megathrust earthquakes
Concept
Q24039748
Kantō earthquakes
Concept
Q132480
Kantō Region
Concept
Q7398956
Sagami Trough
LOC
Q7398956
Sagami Trough
LOC
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36
NUMBER
+43^^http://www.w3.org/2001/XMLSchema#decimal
43
NUMBER
part of
has cause
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located on terrain feature