Crack in the Ground

[3] The eruptions from the Four Craters Lava Field were accompanied by a slight sinking of the older rock surface, forming a shallow, graben-like structure about 2 miles (3.2 km) wide and extending to the south into an old lake basin.

Crack in the Ground marks the western edge of this small, volcano-tectonic depression.

The crack is the result of a tension fracture along a hingeline produced by the draping of Green Mountain lava flows over the edge of upthrown side of the concealed fault zone.

[2] Hikers can walk the length of the main crack and explore its tributaries.

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