Selandia Baru · Stratovolkan
Pulau Raoul
Raoul Island
- Tipe
- Stratovolkan
- Ketinggian
- 516 m
- Letusan terakhir
- 2006
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- Tipe
- Stratovolkan
- Negara
- Selandia Baru
- Wilayah
- Tonga & Kermadec / Northern Kermadec Volcanic Arc
- Ketinggian
- 516 m
- Koordinat
- -29.270, -177.920
- Letusan terakhir
- 2006
- Kondisi tektonik
- Zona subduksi / Kerak samudra (< 15 km)
- Bentuk lahan
- Komposit
- Batuan utama
- Andesit / Andesit basaltik
Ringkasan geologi
Anvil-shaped Raoul Island is the largest and northernmost of the Kermadec Islands. During the past several thousand years volcanism has been dominated by dacitic explosive eruptions. Two Holocene calderas exist, the older of which cuts the center the island and is about 2.5 x 3.5 km wide. Denham caldera, formed during a major dacitic explosive eruption about 2200 years ago, truncated the W side of the island and is 6.5 x 4 km wide. Its long axis is parallel to the tectonic fabric of the Havre Trough that lies W of the volcanic arc. Historical eruptions during the 19th and 20th centuries have sometimes occurred simultaneously from both calderas, and have consisted of small-to-moderate phreatic eruptions, some of which formed ephemeral islands in Denham caldera. An unnamed submarine cone, one of several located along a fissure on the lower NNE flank, has also erupted during historical time, and satellitic vents are concentrated along two parallel NNE-trending lineaments.
Riwayat letusan
18 tercatatGlosariumGaris waktu rinci
- 2006VEI 1Teramati2006-03-17 – 2006-03-17Green Lake crater
- 1987VEI 0Metode tidak dinyatakan1987-03-25 – 1987-03-25NNE flank (7 km from Raoul Island)
- 1964VEI 2Teramati1964-11-19 – 1965-04-25West side of Green Lake, Denham caldera
- 1886VEI 0Teramati1886-03-16 – akhir tidak diketahuiNNE flank (7.5 km from Raoul Island)
- 1870VEI 3Teramati1870-06-20 – 1870-10-03Denham caldera, Green Lake
- 1814VEI 3Teramati1814-03-09 – akhir tidak diketahuiDenham caldera and Smith Crater
- 1720 (±50 tahun)VEI 4Perkiraan geologi1720 – akhir tidak diketahuiDenham Bay?, Tui Lake Crater
- 1630 (±50 tahun)VEI 4Perkiraan geologi1630 – akhir tidak diketahuiRangitahua Crater
- 1450VEI ?Perkiraan geologi1450 – akhir tidak diketahuiNE of Raoul Island (Meyer Islands)
- 850VEI 4Perkiraan geologi850 – akhir tidak diketahuiExpedition Crater
- 700VEI 3Perkiraan geologi700 – akhir tidak diketahuiPukekohu Crater
- 550VEI 4Perkiraan geologi550 – akhir tidak diketahuiGreen Lake Pumice Crater
- 400VEI 4Perkiraan geologi400 – akhir tidak diketahuiS part Raoul Caldera
- 100VEI 4Perkiraan geologi100 – akhir tidak diketahuiN flank Moumoukai volcano
- 50 SMVEI 3Perkiraan geologi50 SM – akhir tidak diketahuiDenham caldera?
- 250 SM (±75 tahun)VEI 6Perkiraan geologi250 SM – akhir tidak diketahuiDenham caldera
- 1200 SM (±150 tahun)VEI 4Perkiraan geologi1200 SM – akhir tidak diketahuiSW part of Raoul caldera
- 2000 SM (±100 tahun)VEI 4Perkiraan geologi2000 SM – akhir tidak diketahuiSE Raoul caldera
Gunung api terdekat
Tautan eksternal
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