Giappone · Stratovulcano
Hachijō-jima
Hachijojima
- Tipo
- Stratovulcano
- Altitudine
- 854 m
- Ultima eruzione
- 1606
- Tipo
- Stratovulcano
- Paese
- Giappone
- Regione
- Pacifico nord-occidentale / Izu Volcanic Arc
- Altitudine
- 854 m
- Coordinate
- 33.137, 139.766
- Ultima eruzione
- 1606
- Contesto tettonico
- Zona di subduzione / Crosta oceanica (< 15 km)
- Forma vulcanica
- Composito
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
Hachijojima, in the central Izu Islands about 300 km S of Tokyo, consists of two small Quaternary dominantly basaltic stratovolcanoes forming an elongated NW-SE-trending island. The eroded Pleistocene-to-Holocene Higashiyama volcano occupies the SE end of the 14-km-long island. The symmetrical Holocene Nishiyama volcano the NW end has cones on the SE flank. The small volcanic island of Kojima lies several kilometers W of Hachijojima. Growth of Higashiyama began several tens of thousands of years ago, and included the formation of two small calderas. The initial submarine and early subaerial eruptions of Nishiyama took place from 10,000 to 8,000 years before present (BP). Its latest major activity, from the early Holocene until about 4,000 BP, was restricted to flank eruptions. Eruptions recorded since the 15th century have been restricted to the summit of Nishiyama and a submarine vent of unknown location.
Sintesi da Wikipedia
Riassunto in ingleseHachijō-jima is a volcanic island of Japan in the Pacific Ocean. It is about 287 km (178 mi) south of the special wards of Tokyo. It is part of the Izu archipelago and within the Fuji-Hakone-Izu National Park. Its only municipality is Hachijō. On 1 March 2018, its population was 7,522 people living on 63 km2. Some inhabitants speak Hachijō language, which is considered an endangered language and the number of speakers is unknown. The island has been inhabited since the Jōmon period, and was used as a place of exile during the Edo period. In modern times, it has been used for farming sugarcane and housing a secret submarine base during World War II; it is now a tourist destination within Japan.
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Storia delle eruzioni
19 registrateGlossarioCronologia dettagliata
- 1707VEI 2Metodo non indicato1707 – fine sconosciuta
- 1606VEI 2Osservata1606-01-23 – fine sconosciutaSubmarine flank
- 1605VEI 2Osservata1605-10-27 – fine sconosciutaNishi-yama SE flank
- 1518VEI 2Osservata1518-02 – 1523Nishi-yama
- 1487VEI 2Osservata1487-12-07 – fine sconosciutaNishi-yama
- 850 (±200 anni)VEI ?Stima geologica850 – fine sconosciutaNishi-yama summit and SE flank
- 150 a.C. (±50 anni)VEI ?Stima geologica150 a.C. – fine sconosciutaNishi-yama
- 350 a.C. (±500 anni)VEI 3Stima geologica350 a.C. – fine sconosciutaNW flank of Higashi-yama
- 1150 a.C. (±700 anni)VEI ?Stima geologica1150 a.C. – fine sconosciutaSE flank of Nishi-yama (Kanda-yama)
- 1250 a.C. (±800 anni)VEI ?Stima geologica1250 a.C. – fine sconosciutaNishi-yama
- 2050 a.C.VEI 5Stima geologica2050 a.C. – fine sconosciutaSE of Nishi-yama, NE of Higashi-yama
- 2450 a.C. (±500 anni)VEI 4Stima geologica2450 a.C. – fine sconosciutaNishi-yama
- 2550 a.C. (±500 anni)VEI 3Stima geologica2550 a.C. – fine sconosciutaS flank of Higashi-yama (Myohoji)
- 2700 a.C. (±100 anni)VEI 3Stima geologica2700 a.C. – fine sconosciutaBetween Nishi-yama & Higashi-yama
- 3350 a.C. (±1300 anni)VEI ?Stima geologica3350 a.C. – fine sconosciutaNishi-yama
- 4650 a.C.VEI 5Stima geologica4650 a.C. – fine sconosciutaNishi-yama
- 5020 a.C. (±370 anni)VEI 3Stima geologica5020 a.C. – fine sconosciutaHigashi-yama south flank
- 7650 a.C. (±3000 anni)VEI ?Stima geologica7650 a.C. – fine sconosciutaNishi-yama
- 8020 a.C. (±2640 anni)VEI 4Stima geologica8020 a.C. – fine sconosciutaNishi-yama
Vulcani nelle vicinanze
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