Itoigawa-Shizuoka Tectonic Line

The blue line to the left represents the fault, with the Fossa Magna shaded in orange.

Itoigawa-Shizuoka Tectonic Line (ISTL) (糸魚川静岡構造線, Itoigawa Shizuoka Kōzō Sen), also Ito Shizu Sen (糸静線) is a major fault on Honshu island that runs from the city of Itoigawa, Niigata Prefecture, through Lake Suwa to the city of Shizuoka in Shizuoka Prefecture. It is often confused with the Fossa Magna, a geological feature it forms the western boundary of.

Seismic activity

Recent significant earthquakes on this tectonic line include:

M5.4; 30 June 2011; epicentre near Matsumoto, Nagano; 1 death, 17 injuries.^[1]^[2]^[3]
M6.7; 22 November 2014; epicentre near Hakuba, Nagano; 46 injuries.^[4]^[5]^[6]

References

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

Large	Amur Plate Okhotsk Plate Philippine Sea Plate Yangtze Plate

Small	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

Other	Boso Triple Junction

Coordinates: 35°29′28.4″N 138°19′33.6″E / 35.491222°N 138.326000°E / 35.491222; 138.326000

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