Land subsidence from 1951-1977 lignite coal bed fire (Coal Vein Trail, Little Missouri Badlands, North Dakota, USA) 8 : 無料・フリー素材/写真
Land subsidence from 1951-1977 lignite coal bed fire (Coal Vein Trail, Little Missouri Badlands, North Dakota, USA) 8 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | The right foreground is part of a landscape that experienced subsidence (sinking) caused by a subsurface coal fire that burned from 1951 to 1977.----------------------------From a park service trail guide:CollapseIn this area, there was a 12-foot thick coal vein deep underground. In 1951, it caught fire and burned for 26 years. As it burned away, the rocks above were left unsupported and the surface collapsed, forming [this] depression. . . . Before the fire, the land was level with the top of the stairs.Burn OutVisitors could see smoke, glowing coals, and sometimes flames. They even roasted marshmallows over the fire!Ignition[The] coal vein ignited during a lightning storm in 1951. Even today, these natural fires can be started by lightning, prairie fires, or even spontaneous combustion.----------------------------Locality: along Coal Vein Trail, Little Missouri Badlands, South Unit of Roosevelt National Park, western North Dakota, USA |
| 撮影日 | 2008-08-28 14:18:21 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |