Bolshaya Udina in Russia could erupt at "any moment". This photo is a stock image (Image: GETTY)
In 2017, increasing seismic activity was detected underneath and geophysicist Ivan Koulakov told CNN: “At any moment, an eruption could occur.” Mr Koulakov believes the volcano should be reclassified as active. 100 weak seismic events were detected between 1999 and September 2017.
However, between September 2017 and February of this year, around 2400 events have occurred.
February saw a 4.3 magnitude earthquake underneath the volcano, the strongest such event to be recorded in the area.
On the Richter Scale, this means the activity can be felt by most people with noticeable shaking of indoor objects and rattling.
Some people will feel the activity outside the affected zone.
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Seismic activity has increased since 2017. This
