When do we say that the volcano is erupted
Answers
Answer:
Most volcanoes provide warnings before an eruption. Magmatic eruptions involve the rise of magma toward the surface, which normally generates detectable earthquakes. It can also deform the ground surface and cause anomalous heat flow or changes in the temperature and chemistry of the groundwater and spring waters. Steam-blast eruptions, however, can occur with little or no warning as superheated water flashes to steam.
Notable precursors to an eruption might include:
An increase in the frequency and intensity of felt earthquakes
Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground
Subtle swelling of the ground surface
Small changes in heat flow
Changes in the composition or relative abundances of fumarolic gases
Hello friend!