Four Craters Lava Field is a basaltic volcanic field located south east of Newberry Caldera in the U.S. state of Oregon.

[1] The volcanic field covers about 30 square kilometers and post-dates Mount Mazama's eruption.

The eruptions from the field were accompanied by a slight sinking of the older rock surface.

This shallow, graben-like sink is about 3 kilometers wide and extends to the south into an old lake basin.

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.