Increased thermal activity (fumaroles,hot springs)in a volcanic area may signal the presence of hot magma at shallow depths in the crust.

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Increased thermal activity in a volcanic area, such as the presence of fumaroles and hot springs, is often a strong indication of the presence of hot magma at shallow depths in the Earth's crust. This is because the hot magma can heat up underground water sources, causing them to rise to the surface and form geothermal features like steam vents and hot springs. Therefore, increased thermal activity is usually a sign that a volcano is becoming more active and could potentially erupt.

Increased Thermal Activity (Fumaroles,hot Springs)in a Volcanic Area May Signal