What type of eruptions occur in shield volcanoes?

Shield volcanoes are characterized by their broad, gently sloping sides and are primarily built up by the flow of low-viscosity lava. This type of lava is typically basaltic, enabling it to flow easily over long distances. Effusive eruptions in shield volcanoes result in the gradual buildup of layers as lava spreads out in thin flows rather than exploding violently.

The effusive nature of these eruptions is significant because it contrasts with other types of eruptions that can be more explosive and hazardous. In shield volcanoes, the low viscosity of the lava allows gas to escape more easily, reducing the likelihood of explosive activity and resulting in smooth, flowing lava that adds to the volcano's shield-like profile. This mechanism of eruption leads to the formation of vast lava plateaus and shield-like landforms, hence their name.