Ōu Mountains


Ōu Mountains

▪ mountains, Japan
Japanese  Ōu-sammyaku,  

      range forming the backbone of northeastern Honshu, Japan, and extending for 310 miles (500 km) south from Aomori ken (prefecture) to Fukushima ken. Geologically, dominant Tertiary sediments are occasionally interrupted by intrusions of the basement granitic and gneissic core. These intrusions, such as Mount Waga, frequently attain much higher elevations than the surrounding formations. The margins of the mountains drop down by fault scarps to the Kitakami River valley in the east and to a row of longitudinal basins in the west.

      The elevation of the range is greatly modified by the overlapping of the Nasu Volcanic Zone. From north to south the overtowering volcanic groups, each bearing the name of its major peak, are Hakkōda, Iwate, Sugawa, Funagata, Zaō, Azuma, and Bandai. The eruption of Mount Bandai in 1888 resulted in debris accumulation on its northern flank and the consequent formation of numerous lakes, thereby greatly altering the drainage pattern of the entire area.

      A salient feature of the Ōu Mountains is the row of depressions along its axis. Significant among them are, from north to south, the Hanawa and Shizukuishi basins, the Waga River valley, and the Onikōbe and Inawashiro basins.

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Universalium. 2010.

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