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difference of active and inactive volcanoes

Sagot :

Difference between active and inactive volcano.

  • In our country, Philippine Institute of Volcanology and Seismology (PHIVOLCS) is responsible in classifying volcanoes whether it is an active or inactive.
  • A certain volcano is considered as an active if it has a record of eruption.
  • Since there are different types of eruption for every kind of a volcano, but as long as the hot molten material known as magma is released by a volcano it is considered as active.
  • Usually prior to major eruption of an active volcano, there are significant changes to its vent. Smoke is coming out, drying of leaves of vegetation near on top of volcano, swelling of the ground, increase in temperature of hot spring, frequent occurrences of volcanic quakes and the crater starts to glow because of the presence of magma signifies that in a moment a volcano will erupt according to its nature.
  • A volcano is also considered as active if it erupted for the last 600 years. In some cases, a volcano can still be classified as an active even its last eruption was 10,000 years ago as long as its materials show significant information for the possible eruption in the future.
  • A volcano is considered inactive if there is no record of eruption from the past 10,000 years. Within this period, a volcano undergoes physical changes that affect to its appearance and being subject to a process known as weathering.
  • Signs of possible volcanic eruption are not usually observed for almost 10,000 years until such time that volcanologist declares a certain volcano to be inactive. Usually a plate movement triggers a volcano to erupt making the magma to rise above the surface. In case of hotspot, a permanent source of magma under the crust continues to supply molten materials to the surface.
  • But if this surface particularly the crust moves because of plate movement, the volcano will also change its location moving away to the hotspot and no longer erupt instead a new volcano is formed.

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