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How do you know when a volcano erupts?

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Quick Answer

According to the UCSB Geology Department, a volcanic eruption is defined as a volcanic event resulting in the emission of gases, lava, ash or other material from a volcano. These can manifest as a single eruptive pulse, an eruptive phase or an eruptive episode.

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How do you know when a volcano erupts?
Credit: Vicente Villamón CC-BY-2.0

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Eruptive pulses are a one-time emission, lasting a few seconds to a few minutes. Eruptive phases are eruptions that continue for a few hours or days, switching between ash and lava expulsion. Eruptive episodes are several connected eruptive phases over the course of several days, months or years. In a single eruption, the style, strength and ejected material may change hour by hour.

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