Crack in the Ground
Crack in the Ground is a volcanic fissure over 2 miles (3.2 km) long with depths measuring as much as 70 feet (21 m) below ground level in Central Oregon, United States.[1] 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. The fissure is located in the southwest corner of Four Craters Lava Field in the Deschutes National Forest.[2] Hikers can walk the length of the main crack and explore its tributaries.
See also
References
- ^ "Crack In The Ground". Fort Rock Museum. Retrieved 2007-12-02.
- ^ "Four Craters Field". US Forest Service. Archived from the original on 2010-11-09.
43°19′30″N 120°39′55″W / 43.32508°N 120.66520°W
 | This article about a specific United States geological feature is a stub. You can help Wikipedia by expanding it. |
 | This Lake County, Oregon state location article is a stub. You can help Wikipedia by expanding it. |