The Old Faithful geyser in the YellowStone national park

This pic has been taken while The Old Faithful geyser in the YellowStone national park (Wyoming) was erupting.
Its eruption intervals have long varied around an average of 65 minutes, ranging from 30 to 120 minutes. Recent earthquakes have lenghtened the average interval to 75 minutes.
September 5, 1998.