Hazard profile - Volcanoes (1)

What is the predictability of volcanoes?

They are not very predictable, even with close monitoring but there can be warning signs (eg tremors, gas, shape, magnetic field etc)

What theory can be used to try and predict volcanoes?

Gap theory

Are large volcano events frequent?

No - the larger the event, the less frequent it is as it needs time to build up energy (magma and gases)

Do volcanoes have a long or short duration of hazards?

Long - with many hazards continuing for months, years or decades (Monserrat)

What is the speed of onset for volcanoes like?

It can take weeks, months or years from ash and gases release to full eruption

What is the volcanic areal extent like?

Lava and pyroclastic flow can be on a local scale but ash clouds can be continental and block off airspace (eg Iceland eruption)