Volcanic Fields volcanic fields, such as Auckland and Northland, room where tiny eruptions happen over a wide geographic area, and also are spaced over long periods that time (thousands that years). Every eruption builds a brand-new single brand-new volcano, i m sorry does not erupt again. Mount Eden and Rangitoto Island are examples in Auckland.

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Cone Volcanoes Cone volcanoes (also referred to as composite cone or stratovolcanoes) such together Ruapehu, Taranaki / Egmont and Ngauruhoe, are qualified by a succession of small-moderate eruptions native one location. The commodities from the successive eruptions over thousands of years develop the cones.


Caldera Volcanoes Caldera volcanoes, such together Taupo and Okataina (which has Mt Tarawera), have a history of infrequent but moderate-large eruptions. The caldera creating eruptions produce super craters 10-25 kilometres in diameter and deposit cubic kilometre of ash and also pumice.

Types that eruptions

Multiple species of eruptions can occur at every of new Zealand’s volcanoes - the eruption form can vary minute come minute. The format of eruption relies on a variety of factors, including the magma chemistry and also content, temperature, viscosity (how runny the magma is), volume and how much water and also gas is in it, the visibility of groundwater, and the plumbing of the volcano. For details on volcanic perils which can be created by ours volcanoes, click here.

Hydrothermal eruptionAn eruption propelled by the warm in a hydrothermal systems. Hydrothermal eruptions pulverise bordering rocks and also can create ash, yet do not incorporate magma. This are commonly very tiny eruptions

Phreatic eruptionAn eruption moved by the warm from magma communicating with water. The water deserve to be from groundwater, hydrothermal systems, surface ar runoff, a lake or the sea. Phreatic eruptions pulverise surrounding rocks and can develop ash, but do no include brand-new magma.

Phreatomagmatic eruption An eruption resulting from the interaction of brand-new magma or lava v water and can be an extremely explosive. The water deserve to be native groundwater, hydrothermal systems, surface ar runoff, a lake or the sea.

Lava Lava is molten rock erupted in ~ the floor surface. As soon as molten absent is beneath the ground, it is referred to as magma.

Lava operation room the effusive (non-explosive) outpourings the lava, and usually circulation slower than walking pace. Lava flow types include a’a, blocky and also pahoehoe.Lava fountains space a fountain of runny lava pieces from a vent or line of vents (a fissure). They can kind spatter piles, and if the pieces accumulate fast enough, castle can type lava flows.Lava domes are piles that kind when viscous lava is erupted slowly and also piles up end the vent, rather than relocating away together a lava flow. They are typically caused through viscous, thick, sticky lava that has lost many of its gas. They can range in volume native a few cubic metres come cubic kilometres.

Strombolian and Hawaiian eruptionsThese are the the very least violent types of explosive eruptions. Hawaiian eruptions have fire fountains and lava flows, vice versa, Strombolian eruptions have actually explosions bring about a shower head of lava fragments.

Vulcanian eruptions Vulcanian eruptions are small to middle explosive eruptions, lasting seconds to minutes. Ash columns can be approximately 20 kilometres in height, and also lava blocks and bombs may be ejected native the vent.

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Subplinian and also Plinian eruptions Eruptions v a high price of magma discharge, sustained for minute to hours. They form a tall, convective eruption obelisk of a mixture the gas and also rock particles, and also can cause vast dispersion of ash. Subplinian eruption columns space up to 20 kilometres high, and also are relatively unsteady, conversely, Plinian eruptions have 20 come 35 km tall columns which might collapse to type pyroclastic thickness currents (PDC’s). Very rare Ultraplinian eruptions are even larger and also have a higher magma discharge price than Plinian eruptions.