Its north–south length is 6.5 km (4.0 mi), east–west 6 km (3.7 mi). The coast is 15.6 km (9.7 mi), with 6–10 km (3.7–6.2 mi) of sandy beach. Weizhou rises in the south, where Nanwan Port (南灣港; pinyin: nánwān gǎng) is located. Coral reefs have been established around the island.
Climate
Climate data for Weizhou Island (1991–2020 normals)
Weizhou Island is China's youngest volcanic island.[3] Its origin is probably from a mantle plume that rose 50–32 million years ago, as a result from the collision of the Indian and Eurasianplates. When the plume reached the asthenosphere, it helped to create the South China Sea by the plume's lateral flow. An evidence that the plume still exists is that a lot of basalt has since the Pliocene erupted in the South China Sea and its adjacent areas, for example the Yandunling (烟墩岭) and Yantouling (烟头岭) volcanoes, Leiqiong (雷琼) volcano group, Weizhou Island and Xieyang Island.
The mantle below the Weizhou island has an average temperature of 1,661 °C, which is between the corresponding values of the Hawaiihotspot and the Icelandhotspot.
[4]
There have been four periods of volcanic activity on the site, the first one occurred in the early Pleistocene, when mainly ash began to erupt from the bottom of the sea. The second time, between 9–225 million years ago, started with basaltic magma eruptions, and ended with pyroclastic eruptions. This was the time with the heaviest eruptions on Weizhou and Xieyang. The third time began with large amounts of volcanic bombs and ended with basaltic magma, this was from 200,000 to 15,000 years ago. The fourth time, from 10,000 to 7,100 years ago, a few intermittent eruptions happened, first mainly with volcanic bombs, and in the end volcanic ash.[5]
History
From 1869 to 1879, the French built a Gothic-style 15 metre Catholic church (涠洲天主教堂) in Shengtang Village (盛塘村; pinyin: shèngtáng cūn), Weizhou. Weizhou Chengzai Church (城仔教堂) was built in 1880, also by French Catholics.
Wildlife
Along with smaller Xieyang Island, Weizhou island is a nature reserve named Beihai Weizhoudao Volcano National Geopark to preserve its volcanic features, and protect rich local ecosystem engulfing 147 species of migratory and non-migratory birds, including threatened species such as black-faced spoonbills. An autonomous region-level bird nature reserve was established in 1982, and a bird ringing station for migratory birds was established in 1985. The protected area is located between 20°54′-21°05′N and 109°05′-109°13′E, including Weizhou Island and Xieyang Island, with a total area of 26.3 km2 (10.2 sq mi).[6][7] Weizhou, along with nearby Xieyang, has been designated an Important Bird Area (IBA) by BirdLife International because it supports significant populations of Chinese egrets and fairy pittas.[8]
Since 2015, seasonal presences of Bryde's whales around Weizhou and Xieyang Islands have been recognized, making the discovery the first confirmed case of large cetaceans regularly inhabiting mainland coasts of China.[14] To protect whales, the local government set a new regulation to prohibit fishery within 6 km of the island. Additionally, the fishery administration has begun patrolling to monitor the public not to engage in whale watching activities until the condition of whales have been thoroughly and scientifically assessed.[15]
^Bingyao Chen, Lin Zhu, Thomas A. Jefferson, Kaiya Zhou, Guang Yang, 2019, Coastal Bryde's Whales' (Balaenoptera edeni) Foraging Area Near Weizhou Island in the Beibu Gulf, Aquatic Mammals, Vol.45, Issue 3
