Mount Nasu

Mount Nasu (那須岳, Nasu-dake) is a group of complex volcanoes located in the northeast part of Nikkō National Park, Japan. The tallest peak is Sanbonyari Peak at a height of 1,916.9 m (6,289 ft). Mount Nasu is one of the 100 Famous Japanese Mountains.

Mount Nasu
那須岳
Nasu Mountains
Highest point
PeakSanbonyari Peak
Elevation1,916.9 m (6,289 ft)[1]
ListingMountains of Japan
Coordinates37°09′N 139°57′E
Naming
Language of nameJapanese
Geography
Parent rangeŌu Mountains
Geology
Mountain typeComplex volcano
Last eruptionNovember 1963[2]

Major peaks

Mount Nasu has the following major peaks:

  • Sanbonyari Peak – 1916.9 m
  • Chausu Peak – 1915 m
  • Asahi Peak – 1896 m
  • Minamigatsusan – 1776 m
  • Kuro-oya Peak – 1589 m

These peaks are known collectively as Nasu Five Peaks (那須5岳, Nasu-Go-Take).

Climate
Climate data for Mount Nasu (1991−2020 normals, extremes 1976−present)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 12.7
(54.9)		 16.8
(62.2)		 21.1
(70.0)		 26.8
(80.2)		 29.6
(85.3)		 30.3
(86.5)		 31.8
(89.2)		 32.2
(90.0)		 29.5
(85.1)		 24.6
(76.3)		 20.0
(68.0)		 17.4
(63.3)		 32.2
(90.0)
Average high °C (°F) 1.9
(35.4)		 2.7
(36.9)		 6.8
(44.2)		 13.0
(55.4)		 18.2
(64.8)		 20.7
(69.3)		 24.3
(75.7)		 25.4
(77.7)		 21.4
(70.5)		 16.1
(61.0)		 10.9
(51.6)		 5.1
(41.2)		 13.9
(57.0)
Daily mean °C (°F) −1.7
(28.9)		 −1.3
(29.7)		 2.0
(35.6)		 7.8
(46.0)		 13.0
(55.4)		 16.4
(61.5)		 20.2
(68.4)		 21.0
(69.8)		 17.3
(63.1)		 11.8
(53.2)		 6.4
(43.5)		 1.1
(34.0)		 9.5
(49.1)
Average low °C (°F) −5.3
(22.5)		 −5.3
(22.5)		 −2.4
(27.7)		 2.6
(36.7)		 7.7
(45.9)		 12.3
(54.1)		 16.7
(62.1)		 17.5
(63.5)		 13.8
(56.8)		 7.7
(45.9)		 2.0
(35.6)		 −2.6
(27.3)		 5.4
(41.7)
Record low °C (°F) −11.7
(10.9)		 −12.1
(10.2)		 −10.4
(13.3)		 −6.0
(21.2)		 −2.3
(27.9)		 3.6
(38.5)		 8.7
(47.7)		 8.9
(48.0)		 3.2
(37.8)		 −1.2
(29.8)		 −6.1
(21.0)		 −10.2
(13.6)		 −12.1
(10.2)
Average precipitation mm (inches) 52.6
(2.07)		 42.8
(1.69)		 101.6
(4.00)		 139.6
(5.50)		 180.8
(7.12)		 220.5
(8.68)		 305.7
(12.04)		 303.9
(11.96)		 305.3
(12.02)		 212.6
(8.37)		 89.2
(3.51)		 60.1
(2.37)		 2,014.7
(79.33)
Average snowfall cm (inches) 103
(41)		 79
(31)		 45
(18)		 7
(2.8)		 0
(0)		 0
(0)		 0
(0)		 0
(0)		 0
(0)		 0
(0)		 4
(1.6)		 55
(22)		 293
(116.4)
Average precipitation days (≥ 1.0 mm) 9.1 8.3 10.4 11.3 12.1 15.9 18.3 17.0 14.8 11.5 8.3 9.1 146.1
Average snowy days (≥ 1 cm) 11.5 8.8 5.5 0.6 0 0 0 0 0 0 0.4 5.9 32.7
Mean monthly sunshine hours 131.0 129.0 156.4 170.4 169.1 108.8 98.7 115.3 98.9 115.1 130.1 132.6 1,555.2
Source 1: JMA[3]
Source 2: JMA[4]

Eruption

It is estimated that Mount Nasu started erupting 600 thousand years ago. The eruption started from the north end of the mountain range, at Kashi-Asahi Peak. Only Chausu Peak is active today.

Access
  • Chausu lava dome and Asahi Peak
    Chausu lava dome and Asahi Peak
  • Chausu lava dome and fumes
    Chausu lava dome and fumes
  • Asahi Peak
    Asahi Peak
  • West view from Sanbonyari Peak
    West view from Sanbonyari Peak
  • Sanbonyari Peak and snow in summer
    Sanbonyari Peak and snow in summer
  • At the Sanbonyari Peak
    At the Sanbonyari Peak
  • Topographic map
    Topographic map
  • To Asahi Peak
    To Asahi Peak

References
  1. "Topographic map of Mount Nasu". opentopomap.org. Retrieved 2023-06-12.
  2. "Nasudake". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-24.
  3. 観測史上1～10位の値（年間を通じての値）. JMA. Retrieved February 18, 2022.
  4. 気象庁 / 平年値（年・月ごとの値）. JMA. Retrieved February 18, 2022.
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