How do you know when a volcano it's coming?

Answer 1

As magma moves towards the surface, there will be minor changes in the local gravity and magnetic fields. there may be alterations to the shape of the mountain, detected by tilt meters, or laser interferometry.

In New Zealand, a half-dozen volcanoes are monitored, and this may well be true in other 'Pacific Circle of Fire' countries.

Answer 2

Scientists monitor volcanoes using various methods such as seismometers, gas sensors, and ground deformation measurements. By analyzing changes in volcanic activity like increased seismicity, gas emissions, and ground swelling, scientists can forecast potential eruptions. Additionally, historical eruption patterns and the volcano's past behavior are also considered when evaluating the likelihood of an eruption.