The Info List - Boso Triple Junction

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Boso Triple Junction
Boso Triple Junction
(also known as Off-Boso Triple Junction) is a triple junction off the coast of Japan; it is the only known example of a trench-trench-trench triple junction on the Earth. It is the meeting point of the North American Plate
North American Plate
(represented by the Okhotsk subplate) to the north, the Pacific Plate
Pacific Plate
to the east and the Philippine Sea Plate
Philippine Sea Plate
to the south.[1]


1 Name origin 2 Formation 3 Risks 4 References

Name origin[edit] The Boso Triple Junction
Boso Triple Junction
is named after the Boso peninsula. Formation[edit] It is formed from the junction of the Izu-Bonin-Mariana Arc
Izu-Bonin-Mariana Arc
where the Izu-Bonin Trench
Izu-Bonin Trench
meets with the Japan Trench
Japan Trench
and the Sagami Trench. Risks[edit] Located some 300 kilometres (190 mi) from the Boso triple junction, Tokyo
is subject to quakes and tsunamis generated from slips along this junction. Furthermore, there is a large populated region along the coast of the main island that would also be subject to damage. This junction probably has the highest associated insurance risk in the world, due to its proximity to extensive urban development.[citation needed] The 2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
were generated along the Japan trench well to the north of the junction and did not involve the other two trenches, although quakes that may have been aftershocks have been observed there[clarification needed]. References[edit]

^ Renard, V.; et al. (1987). "Trench triple junction off Central Japan—preliminary results of French-Japanese 1984 Kaiko cruise, Leg 2" (PDF). Earth and Planetary Science Letters. 83: 243–256. Bibcode:1987E&PSL..83..243R. doi:10.1016/0012-821x(87)90069-0. CS1 maint: Explicit use of et al. (link)

v t e

Triple junctions

Triple Trench

Boso Banda Sea

Triple Ridge

Aden-Owen-Carlsberg Afar Azores Galapagos Bouvet Rivera Rodrigues Tongareva

Triple Fault


Trench Trench Ridge


Fault Fault Trench

Kamchatka-Aleutian Mendocino

Ridge Fault Fault


Ridge Trench Fault

Queen Charlotte

See also

Mount Fuji

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Tectonic plates of East Asia
East Asia
(Eurasian Plate- Pacific Plate
Pacific Plate
Convergence Zone)


Amur Plate Okhotsk Plate Philippine Sea Plate Yangtze Plate


Mariana Plate Okinawa Plate Philippine Mobile Belt

Faults and rift zones

Baikal Rift Zone Fukozu Fault Idosawa Fault Itoigawa-Shizuoka Tectonic Line Izu-Bonin-Mariana Arc Japan Median Tectonic Line Longmenshan Fault Neodani Fault Nojima Fault Northeastern Japan Arc Philippine Fault System Senya Fault Tanna Fault Ulakhan Fault Urasoko fault

Trenches and troughs

Kuril Trench Mariana Trench Japan Izu-Ogasawara Trench Japan Trench Nankai Trough Sagami Trough Suruga Trough Okinawa Trough Ryukyu Trench Philippines Manila Trench Philippine Trench East Luzon Trench


Boso Triple Junction

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