Jepang · Kaldera
Iwo Jima
Ioto
- Tipe
- Kaldera
- Ketinggian
- 172 m
- Letusan terakhir
- 2025
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- Tipe
- Kaldera
- Negara
- Jepang
- Wilayah
- Pasifik Barat Laut / Ogasawara Volcanic Arc
- Ketinggian
- 172 m
- Koordinat
- 24.750, 141.289
- Letusan terakhir
- 2025
- Kondisi tektonik
- Zona subduksi / Ketebalan kerak tidak diketahui
- Bentuk lahan
- Kaldera
- Batuan utama
- Trakiandesit / Trakiandesit basaltik
Ringkasan geologi
Ioto, also known as Ogasawara-Iojima to distinguish it from several other "Sulfur Island" volcanoes, lies within a 9-km-wide submarine caldera.The triangular, low-elevation, 8-km-long island narrows toward its SW tip and has produced trachyandesitic and trachytic rocks that are more alkalic than those of other volcanoes in the Ogasawara Volcanic Arc. The island has undergone uplift for at least the past 700 years, accompanying resurgent doming of the caldera; a shoreline landed upon by Captain Cook's surveying crew in 1779 is now 40 m above sea level. The Motoyama plateau on the NE half of the island consists of submarine tuffs overlain by coral deposits and forms the island's high point. Many fumaroles are oriented along a NE-SW zone cutting through Motoyama. Numerous recorded phreatic eruptions, many from vents on the W and NW sides of the island, have accompanied the uplift.
Riwayat letusan
33 tercatatGlosariumGaris waktu rinci
- 2025VEI 1Teramati2025-09-01 – 2025-09-02
- 2023VEI 1Teramati2023-10-18 – 2024-03-16
- 2022VEI 1Teramati2022-07-11 – 2022-12-11Off SE coast
- 2021VEI 1Teramati2021-08-12 – 2021-11-24Off SE coast
- 2020VEI 1Teramati2020-12-28 – 2021-04-05Asodai Sinkhole
- 2018VEI 1Teramati2018-09-08 – 2018-09-14Off the S coast
- 2016VEI 1Teramati2016-08-31 – 2016-09-01Asodai Sinkhole
- 2015VEI 1Teramati2015-08-07 – 2015-08-07Kianohana Beach (N part of the island)
- 2013VEI 0Teramati2013-08-21 – 2013-08-30Off the NE coast
- 2012VEI 1Teramati2012-12-01 – 2013-04-11Asodai
- 2012VEI 1Teramati2012-02-10 – 2012-07-09Asodai
- 2010VEI 1Teramati2010-06-19 – 2010-06-19
- 2004VEI 1Metode tidak dinyatakan2004-06-06 – 2004-06-08Asodai area
- 2001VEI 1Teramati2001-09-21 – 2001-10-23Off SE coast and Idogahama (NW coast)
- 1999VEI 1Teramati1999-09-10 – 1999-09-10Asodai area
- 1994VEI 1Teramati1994-08-22 – 1994-08-22NE side
- 1993VEI 1Metode tidak dinyatakan1993-10-27 – 1993-11-16Asodai area and NE of Iwo-jima
- 1982VEI 1Teramati1982-03-09 – 1982-03-10NW side (Idogahama beach)
- 1982VEI 1Teramati1982-11-28 – 1982-12-16West side (Asodai)
- 1980VEI 1Teramati1980-03-13 – 1980-03-13Kitanohara
- 1978VEI 1Teramati1978-12-11 – 1978-12-11West side (Asodai)
- 1976VEI 1Teramati1976-01-16 – akhir tidak diketahuiWest side (Asodai)
- 1974VEI 0Metode tidak dinyatakan1974-01-16 – 1974-02-02NW of Iwo-jima (Kaiseinishinoba)
- 1969VEI 1Teramati1969-01-12 – 1969-01-21West side (Asodai)
- 1969VEI 1Teramati1969-12-01 – 1969-12-01
- 1967VEI 1Teramati1967-12-23 – 1967-12-23West side (Asodai)
- 1957VEI 1Teramati1957-03-28 – 1957-03-28Chidoriga-hara
- 1944VEI 1Teramati1944-12-16 – akhir tidak diketahuiNorth and west sides near the coast
- 1935VEI 1Teramati1935-07-02 – akhir tidak diketahuiSW side at Chidoriga-hara
- 1930VEI 1Teramati1930-07-02 – akhir tidak diketahuiNW side near the coast
- 1922VEI 1Teramati1922-07-16 – akhir tidak diketahuiWest side (Asodai)
- 1889VEI 1Teramati1889-12-31 – akhir tidak diketahuiChidoriga-ana
- 850 SM (±50 tahun)VEI ?Perkiraan geologi850 SM – akhir tidak diketahuiMotoyama
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