What were the first sign to indicate that the mountain was waking up in dantes peak?

In "Dante's Peak," the first signs indicating that the mountain was waking up included the detection of increased seismic activity, such as small earthquakes, and the observation of unusual gas emissions. Additionally, the local hot springs began to bubble more vigorously, and there were changes in water temperature, suggesting volcanic activity beneath the surface. These early warning signs prompted the main character, a volcanologist, to investigate further.