Aoshima, Miyazaki
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Aoshima (青島, Aoshima) is an island located in Miyazaki, Miyazaki Prefecture, Japan. The island has a surface area of 4.4 hectares (10.9 acres) and a height of 6 metres (20 feet). The island is part of the Aoshima Shrine. Miyazaki′s Aoshima neigbbourhood consists of the island and the opposite coastal strip, where the Aoshima Subtropical Botanical Garden is located.[1]
Geology
The island is surrounded by unique rock formations referred to as the Ogre's Washboard (鬼の洗濯板, Oni no Sentakuita), consisting of alternating layers of mud- and sandstone. These layers were originally desposited at the bottom of the ocean by turbitity currents between 24 and 2 million years ago, similar to flysch. The formation has since been uplifted and exposed at an angle by tectonic activity, where the softer mudstone erodes faster than the sanstone, creating the characteristic washboard pattern.[2][3]
Flora
The island is covered with the world's northernmost self-reproducing population of the fan palm, Livistona chinensis (Arecaceae), and is one of two places in Japan with a virgin forest of this indigenous species.[4]
Climate
Aoshima has a humid subtropical climate (Köppen climate classification Cfa) with hot summers and mild winters. Precipitation is significant throughout the year, and is heavier in summer, especially the months of June and July. The average annual temperature in Aoshima is 17.6 °C (63.7 °F). The average annual rainfall is 2,857.4 mm (112.50 in) with June as the wettest month. The temperatures are highest on average in August, at around 27.0 °C (80.6 °F), and lowest in January, at around 8.1 °C (46.6 °F).[5] The highest temperature ever recorded in Aoshima was 37.8 °C (100.0 °F) on 1 August 2013; the coldest temperature ever recorded was −4.8 °C (23.4 °F) on 27 February 1981.[6]
| Climate data for Aoshima (1981−2010 normals, extremes 1977−2017) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 24.4 (75.9) |
24.4 (75.9) |
27.5 (81.5) |
31.6 (88.9) |
34.8 (94.6) |
34.9 (94.8) |
37.1 (98.8) |
37.8 (100.0) |
36.7 (98.1) |
32.0 (89.6) |
29.6 (85.3) |
24.3 (75.7) |
37.8 (100.0) |
| Mean maximum °C (°F) | 19.3 (66.7) |
21.2 (70.2) |
22.8 (73.0) |
26.5 (79.7) |
29.5 (85.1) |
32.8 (91.0) |
34.9 (94.8) |
34.2 (93.6) |
32.6 (90.7) |
28.2 (82.8) |
24.7 (76.5) |
20.6 (69.1) |
35.4 (95.7) |
| Mean daily maximum °C (°F) | 12.2 (54.0) |
13.2 (55.8) |
15.9 (60.6) |
20.2 (68.4) |
23.5 (74.3) |
26.1 (79.0) |
30.4 (86.7) |
30.4 (86.7) |
27.5 (81.5) |
23.3 (73.9) |
18.8 (65.8) |
14.4 (57.9) |
21.3 (70.4) |
| Daily mean °C (°F) | 8.1 (46.6) |
9.2 (48.6) |
12.0 (53.6) |
16.2 (61.2) |
19.8 (67.6) |
22.8 (73.0) |
26.7 (80.1) |
27.0 (80.6) |
24.4 (75.9) |
19.8 (67.6) |
15.0 (59.0) |
10.2 (50.4) |
17.6 (63.7) |
| Mean daily minimum °C (°F) | 4.3 (39.7) |
5.3 (41.5) |
8.2 (46.8) |
12.3 (54.1) |
16.1 (61.0) |
19.8 (67.6) |
23.5 (74.3) |
24.1 (75.4) |
21.5 (70.7) |
16.5 (61.7) |
11.4 (52.5) |
6.3 (43.3) |
14.1 (57.4) |
| Mean minimum °C (°F) | −0.9 (30.4) |
−0.1 (31.8) |
1.8 (35.2) |
5.8 (42.4) |
11.5 (52.7) |
15.6 (60.1) |
20.4 (68.7) |
21.5 (70.7) |
16.9 (62.4) |
10.6 (51.1) |
4.9 (40.8) |
0.6 (33.1) |
−1.6 (29.1) |
| Record low °C (°F) | −4.3 (24.3) |
−4.8 (23.4) |
−2.4 (27.7) |
1.9 (35.4) |
7.8 (46.0) |
12.8 (55.0) |
16.8 (62.2) |
18.8 (65.8) |
13.6 (56.5) |
4.5 (40.1) |
0.5 (32.9) |
−1.8 (28.8) |
−4.8 (23.4) |
| Average precipitation mm (inches) | 80.8 (3.18) |
120.0 (4.72) |
226.3 (8.91) |
256.1 (10.08) |
283.3 (11.15) |
466.9 (18.38) |
276.5 (10.89) |
285.8 (11.25) |
392.5 (15.45) |
257.6 (10.14) |
136.8 (5.39) |
74.8 (2.94) |
2,857.4 (112.50) |
| Average precipitation days (≥ 1.0 mm) | 6.3 | 7.3 | 11.8 | 11.4 | 11.6 | 15.9 | 11.2 | 13.2 | 13.2 | 9.1 | 7.0 | 5.0 | 123 |
| Mean monthly sunshine hours | 161.8 | 150.8 | 160.2 | 167.5 | 154.9 | 160.3 | 174.9 | 190.0 | 148.7 | 158.4 | 144.7 | 160.9 | 1,879 |
| Source: Japan Meteorological Agency[6][5] | |||||||||||||
Access
The nearest railway station is Aoshima Station, on the Nichinan Line operated by JR Kyushu.
The Ogre's Washboard is visible from the Nichinan Line. Upon approach, the Umisachi Yamasachi sightseeing limited express train slows down to allow passengers to take pictures and for an announcement about the formation.
References
- ↑ "Aoshima Island".
- ↑ Ishihara, Yoshiro; Kimata, Keisuke; Onishi, Yuri (2024-05-11). "Random and time-persistent depositional processes in turbidite successions: an example from the marine deep-water Aoshima Formation (Neogene, Kyushu Island, southwest Japan)". Journal of Sedimentary Research. 94 (3): 251–265. doi:10.2110/jsr.2022.067. ISSN 1527-1404.
- ↑ "青島 - 青島の隆起海床と奇形波蝕痕(鬼の洗濯板）｜検索詳細｜地域観光資源の多言語解説文データベース". 地域観光資源の多言語解説文データベース (in Japanese). Retrieved 2026-08-18.
- ↑ "Exploring for Palms in Japan" (PDF). 14 February 2017. University of California Division of Agriculture and Natural Resources. Retrieved 24 December 2021
- 1 2 気象庁 / 平年値（年・月ごとの値）. JMA. Retrieved April 21, 2022.
- 1 2 観測史上1～10位の値（年間を通じての値）. JMA. Retrieved April 21, 2022.
External links
- "Pictures of Aoshima" (in Japanese). Archived from the original on 2018-03-21. Retrieved 2008-09-17.
31°48′18″N 131°28′32″E / 31.805044°N 131.475663°E