What factors would you measure in order to predict the next eruption?

To predict the next volcanic eruption, key factors to measure include seismic activity, such as the frequency and magnitude of earthquakes in the area, which can indicate magma movement. Ground deformation, monitored through GPS or satellite imagery, can reveal changes in the volcano's shape due to magma accumulation. Additionally, gas emissions, particularly the release of sulfur dioxide and carbon dioxide, can signal rising magma and potential eruptions. Lastly, historical eruption patterns and geological studies of the volcano can provide context for predicting future activity.