Q:

How do you know when a volcano erupts?

A:

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.

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

Full Answer

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.

Learn more in Volcanoes

Related Questions

  • Q:

    What is a volcano called that erupts regularly?

    A:

    A volcano that has recently erupted and may erupt again soon is categorized as an active volcano. Dormant and extinct are also categories of volcanoes.

    Full Answer >
    Filed Under:
  • Q:

    What is a volcano?

    A:

    A volcano is a place where molten rock seeps or erupts from beneath the crust. Most volcanoes develop in the oceans, but some occur on land. When the molten rock, which is called lava, erupts with force, large, cone-shaped mountains form, which are also called volcanoes.

    Full Answer >
    Filed Under:
  • Q:

    What happens before a volcanic eruption?

    A:

    According to the United States Geological Survey, before a volcanic eruption, magma must travel upwards through rock. The travelling magma produces these precursors to an eruption: an increase in earthquakes beneath a volcano, volcanic tremors, disturbance of ground features, increased release of steam from the volcano, increased temperatures and increase of gases. Additionally, different catalysts occur beneath the earth's surface prior to an eruption.

    Full Answer >
    Filed Under:
  • Q:

    What is a lateral blast?

    A:

    A lateral blast, also known as a lateral eruption, is a volcanic eruption that occurs out of the side of a volcano instead of at its summit. An example of a lateral blast is the 1980 eruption of Mount St. Helens.

    Full Answer >
    Filed Under:

Explore