Volcanic Tumulus
Volcano Terms and Definition

volcanism
Volcanism
Volcanic eruptions are the clear and dramatic expression of dynamic processes going on in planet Earth. The author, one of the most profound specialists in the field of volcanology, explains in a concise and easy to understand manner the basics and most recent findings in the field of volcanology.

Tumulus about 30 m in diameter on the Hilina Pali road on the south flank of Kilauea Volcano, Hawaii.
Tumulus

The surfaces of pahoehoe flows on flat or gentle slopes often exhibit elliptical, domed structures called tumuli. A tumulus is created when the upward pressure of slow-moving molten lava within a flow swells or pushes the overlying crust upward. Since the solid crust is brittle, it usually breaks to accommodate the "inflating" core of the flow. Such fractures generally extend along the length of a tumulus, and are frequently accompanied by smaller irregular cracks down the sides. Lava commonly squeezes out through these fractures, and sometimes drains from the tumulus to leave a hollow shell.
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Source:
U.S. Department of the Interior