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Diaporama
Actualités
Mount Tarawera seismograph drum showing the earthquakes (GeoNet)
Friday, Jan 16, 2015
A swarm of small earthquakes occurred during 14-15 Jan near Lake Rotomahana. ... [details]
 

Okataina volcan

Lava domes 1111 m / 3,645 ft
New Zealand, -38.12°S / 176.5°E
Condition actuelle: normal / en sommeil (1 sur 5) | Reports
Okataina livres
Last update: 26 Mar 2019
Style éruptif tipique: unspecified
Eruptions du volcan Okataina: 1981 
HeureMag. / DepthDistanceLocation
Wed, 24 Apr 2019
Wed, 24 Apr 16:43 UTCM 1.9 / 3.6 km17 kmNew Zealand
Wed, 24 Apr 14:51 UTCM 1.7 / 136.8 km10 kmNew Zealand
Wed, 24 Apr 14:17 UTCM 1.4 / 5 km27 kmNew Zealand
Wed, 24 Apr 11:32 UTCM 2.7 / 133.4 km23 kmNew Zealand
Wed, 24 Apr 08:17 UTCM 1.9 / 5 km19 kmNew Zealand
Voir tous
Mount Tarawera, located 24 km SE of Rotorua, is the main vent of the Okataina volcanic complex. Tarawera produced one of New Zealand's largest historic eruptions in 1886, when a violent explosive basaltic eruption occurred that killed an estimated 120 people. The fissures that opened up run for about 17 kilometres northeast-southwest.

Introduction:

The massive, dominantly rhyolitic Okataina Volcanic Centre is surrounded by extensive ignimbrite and pyroclastic sheets produced during multiple caldera-forming eruptions. Numerous lava domes and craters erupted from two subparallel NE-SW-trending vent lineations form the Haroharo and Tarawera volcanic complexes.
Lava domes of the Haroharo complex, at the northern end of the Okataina Volcanic Centre, occupy part of the 16 x 26 km Pleistocene Haroharo caldera, which formed incrementally between 300,000 and 50,000 years before present (BP). The oldest exposed rocks on the caldera floor are about 22,000 years old. The Tarawera complex at the southern end of Okataina consists of 11 rhyolitic lava domes and associated lava flows. The oldest domes were formed as late as about 15,000 years BP, and the youngest were formed in the Kaharoa eruption about 800 years BP. The NE-SW Tarawera vent lineation extends from the two dacitic cones of Maungaongaonga and Mangakakaramea on the SW to Mount Edgecumbe on the NE. Construction of the Haroharo and Tarawera complexes impounded lakes Rotoiti, Totoehu, Okataina, and Tarawera against the outer margins of the Okataina ring structure. A major hydrothermal area is located at Waimangu; the world-renowned Pink and White Terrace siliceous sinter deposits were destroyed during the major basaltic explosive eruption of 1886.
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Smithsonian / GVP volcano information


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