Английская Википедия:Crack in the Ground
Crack in the Ground is a volcanic fissure about Шаблон:Convert long [1] with depths measuring nearly Шаблон:Convert below ground level[2] in Central Oregon, United States. The formation of the fissure occurred approximately between 700,000 and 12,000 years ago.[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 Шаблон:Convert 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 at the southwest corner of Four Craters Lava Field.[2] Hikers can walk the length of the main crack and explore its tributaries.
See also
References
Шаблон:Commons category Шаблон:Reflist
Шаблон:US-geology-stub
Шаблон:LakeCountyOR-geo-stub
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