The decrease or disappearance of earthquakes or the color

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It is also interesting to control the emission of gases  since some are usually precursors of this activation. Advances in techniques and tools also make it possible to identify crustal deformation as magma moves and rises. The magma less dense tends to rise to the surface causing bulging. Earthquakes high gas emissions and surface deformation are usually the main indicators that an eruption may occur. So how long does a volcanic eruption last The effects of a volcano can be diverse depending on the circumstances of each area. The type of volcano the time of the eruption or the proximity of populations are conditioning factors when evaluating damage.

But of course when can we consider that a volcano is going out It is very difficult to predict how long a volcanic eruption lasts if not impossible. It is true that certain techniques make it possible to estimate an approximate period through the Photo Background Removing study of gas emissions but with high uncertainty. There are some signs that may indicate that activity is slowing down. The decrease or disappearance of earthquakes or the color of the lava red lava is indicative that the volcano has no intention of stopping are some of these signs. Although possibly the emanation of sulfur is one of the best indicators.

Once this gas stops coming out there may be no more magma and therefore it could be an indicator of when a volcanic eruption ends. What have been the longest eruptions In 1774 the Yasur volcano in Vanuatu erupted and continues unabated today. Normally the eruptions have a much shorter period of activity but it is true that some of them have lasted for tens of years. The Smithsonian Institution has compiled a list of the longest eruptions since 1750. There are 103 volcanoes with an activity greater than 5 years of which 26 are still active.