Mount Zaō

From Wikipedia, the free encyclopedia
  (Redirected from Mount Zao)
Jump to: navigation, search
Mount Zaō
Okama lake zao.JPG
The Okama Crater Lake
Elevation 1,841 m (6,040 ft)
Location
Location Honshū, Japan
Coordinates 38°08′28″N 140°26′35″E / 38.141°N 140.443°E / 38.141; 140.443
Geology
Type Complex volcano
Last eruption May 1940

Mount Zaō (蔵王山 Zaō-san?) is a complex volcano on the border between Yamagata Prefecture and Miyagi Prefecture in Japan. It consists of a cluster of stratovolcanoes and is the most active volcano in northern Honshū. The central volcano of the group includes several lava domes and a tuff cone, Goshiki-dake, which contains a crater lake named Okama. Also known as the "Five Color Pond" (五色沼, goshiki numa) because it changes color depending on the weather, it lies in a crater formed by a volcanic eruption in the 1720s. The lake is 360 metres (1,200 ft) in diameter and 60 m (200 ft) deep, and is one of the main tourist attractions in the area.

North side view
Aerial photoThe Okama Crater Lake 3D, Japan.gif
External images
Snow monsters at Japanese Wikipedia
Aerial photo of Okama, the crater lake, in 1976

One striking feature of Zaō's famous ski resorts is the snow monsters (樹氷 Juhyō?) that appear in mid-winter. Strong wind over the nearby lake fling water droplets which freeze against the trees and their branches, until near-horizontal icicles begin to form. Falling snow settles on the ice formations, and the end result is a grotesque figure of a tree. The effect of a full forest of such trees gives visitors a ghostly impression. Zaō is one of the 100 famous mountains in Japan.

Rotaria rotatoria[1] and Pinnularia spp.[2] are found in the acidic Okama Lake.[3]

See also[edit]

References[edit]

"Zao". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=0803-19%3D.

  1. ^ Deneke, Rainer (2000). "Review of rotifers and crustaceans in highly acidic environments of pH values ≤ 3". Hydrobiologia 433 (1-3): 167–172.  [1]
  2. ^ Negoro, K (1940). "A Pinnularia from Okama, an acidotrophic crater lake of volcano Zao". Jap. J. Limnol 9: 176–179. doi:10.3739/rikusui.9.176. 
  3. ^ Anzai, T (1938). "Limnological observation of Okama, a crater lake of Volcano Zaō". Jap. J. Limnol. 8: 264–272. doi:10.3739/rikusui.8.3-4_264.