GEOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Which event suggests that a volcanic eruption may occur in the very near future? an increase in earthquake activity. Which scientific instrument is used to help predict volcanic eruptions? A scientist will use a model to predict when a volcano might erupt again.

Detailed explanation-3: -Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

Detailed explanation-4: -Moving magma and volcanic fluids cause earthquakes. They occur in swarms (many earthquakes occurring close together) before an eruption. They are caused by liquid magma, hot fluids, and gases forcing their way through the crust to reach the surface.

Detailed explanation-5: -Sometimes, yes. A few large regional earthquakes (greater than magnitude 6) are considered to be related to a subsequent eruption or to some type of unrest at a nearby volcano. However, volcanoes can only be triggered into eruption by nearby tectonic earthquakes if they are already poised to erupt.