Earth:Barren Island (Andaman Islands)

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Short description: Active volcano and island in the Andaman Sea


Barren Island
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Geography
LocationBay of Bengal
Coordinates [ ⚑ ] : 12°17′N 93°52′E / 12.28°N 93.86°E / 12.28; 93.86
ArchipelagoAndaman Islands
Adjacent bodies of waterIndian Ocean
Total islands1
Major islands
  • Barren Island
Area8.34 km2 (3.22 sq mi)[1]
Length3.4 km (2.11 mi)
Width3.1 km (1.93 mi)
Coastline12.38 km (7.693 mi)
Highest elevation353 m (1158 ft)[2]
Administration
 India
DistrictNorth and Middle Andaman
Island groupAndaman Islands
Island sub-groupEast Volcano Islands
TalukRangat Taluk
Demographics
PopulationUninhabited (2017)
Additional information
Time zone
PIN744202[3]
Telephone code031927 [4]
ISO codeIN-AN-00[5]
Official websiteandaman.nic.in
Avg. summer temperature30.2 °C (86.4 °F)
Avg. winter temperature23.0 °C (73.4 °F)
Census Code35.639.0004
Barren Volcano
Ile Barren, 1995.jpg
Barren Island erupting in 1995
Geography
LocationAndaman Islands, India
Geology
Mountain typeStratovolcano with pyroclastic cones
Last eruption2022

Barren Island is an island located in the Andaman Sea. It is the only confirmed active volcano in the Indian subcontinent,[6][7][8][9] and the only active volcano along a chain of volcanoes from Sumatra to Myanmar.[10] It is a part of the Indian Union territory of Andaman and Nicobar Islands, and lies about 138 km (86 mi) northeast of the territory's capital, Port Blair.

History

An illustration of the island in 1789

The first recorded eruption of the volcano dates back to 1787. Since then, the volcano has erupted more than ten times, with the most recent one being in 2022.[11] After the first recorded eruption in 1787, further eruptions were recorded in 1789, 1795, 1803–04, and 1852. After nearly one and a half century of dormancy, the island had another eruption in 1991 that lasted six months and caused considerable damage.[12][13]

The 1991 eruption was particularly harmful to the island's fauna. A team from the Geological Survey of India visited Barren Island on 8–9 April 1993 to assess the impact of the eruption on the distribution, habit, and abundance of animal species. The report found that the eruption had reduced the number of bird species and their population. The team only observed 6 of the 16 known species of birds on the island. The Pied Imperial Pigeon (Ducula bicolor) was the most abundant among the 6 species observed. In a survey conducted at night, the team spotted one rat species (Rattus rattus) and 51 species of insects from eight orders. The report also noted that the volcano was still emitting gas at the time.[10] There were eruptions in 1994–95 and 2005–07, the latter considered to be linked to the 2004 Indian Ocean earthquake.[12] A lighthouse that was established in 1993 was destroyed by the recent eruptions.[14]

A team from the National Institute of Oceanography spotted the volcano erupting on 23 January 2017. Abhay Mudholkar, the head of the team, said, "The volcano is erupting in small episodes of about five to ten minutes. During the day, only ash clouds were observed. However, after sundown, red lava fountains were spewing from the crater into the atmosphere and hot lava flowed streaming down its slopes."[15][16][17]

Based on argon-argon dating of samples from Barren Island, it is now established that the oldest subaerial lava flows of the volcano are 1.6 million years old and the volcano is located on an oceanic crust which is roughly 106 million years old.[18] All recorded eruptions lie on the low end of the Volcanic Explosivity Index. The 2017 eruption was recorded as a 2 on the index.[10]

Geology

This volcanic island stands in the midst of a volcanic belt on the edge of the Indian and Burmese tectonic plates. Narcondam Island is a dormant volcano in the area, apart from volcanic seamounts like Alcock and Sewell. All the historical and recent eruptions (1789 and after) are confined within and around an active polygenetic cinder cone in a 2 km (1.2 mi) wide caldera that was formed by the Pleistocene collapse of a primitive cone of a stratovolcano. The remnant of the primitive volcanic cone forms a precipitous cliff around the island (commonly referred to as caldera wall), with a break towards the west. The highest elevation on the island is 353 m (1,158 ft), with most of the primitive volcano underwater (standing on the seafloor 2,250 metres (7,380 ft) below sea level). The island is 3 km (1.9 mi) in diameter, with a total surface area of 8.34 km2 (3.22 sq mi).[19] The rock types are basalt and andesite, with activity reported in late 2022.[20]

Biodiversity

The island is protected area under Barren Island Wild Life Sanctuary.

True to its name, it has large areas of barren landscape.[10] It is uninhabited by humans, though it has a small population of goats.[21] Additionally, birds like pigeons, bats like flying foxes and a few rodent species such as rats are known to survive the harsh conditions.[22]

A small population of feral goats also found on the island, which surprised geologists. Later, it was found that they were surviving on two fresh water springs and thick vegetation.[23] These goats were kept there by British sailors from a steamer leaving Port Blair in 1891.[24]

Tourist attractions

The waters surrounding Barren Island are reputed to be among the world's top scuba diving destinations. Major attractions here are the crystal clear visibility, manta rays, interesting basalt formations, topography of past lava flows and fast growing coral gardens. This dive destination is remote but can be accessed by either a live aboard ship or with scuba-operators based at Swaraj Island.[25][26]

Administration

Barren Island belongs to the North and Middle Andaman administrative district, part of the Indian union territory of Andaman and Nicobar Islands.[27]

Demographics

The island is uninhabited.[28]

Image gallery

  • Barren Island in 2020

  • Barren Island erupts

  • Crater on Barren Island in 2016

  • Outline map of the Andaman Islands, with the location of Barren Island highlighted (red circle)

  • Topography of the island

  • INS Saryu (P54), IN LCU 55 and IN LCU 58 approaching Barren Island

  • Barren Island seen from INS Saryu (P54) in 2021

See also

  • List of volcanoes in India

References

  1. ↑ "Islandwise Area and Population - 2011 Census". Government of Andaman. http://andssw1.and.nic.in/ecostat/basicstatPDF2013_14/1.Demogrpahy.pdf. 
  2. ↑ (PDF) Sailing Directions (Enroute), Pub. 173: India and the Bay of Bengal. Sailing Directions. United States National Geospatial-Intelligence Agency. 2017. p. 274. https://msi.nga.mil/api/publications/download?key=16694491/SFH00000/Pub173bk.pdf&type=view. 
  3. ↑ "A&N Islands - Pincodes". 2016-09-22. http://www.india-codes.com/pincodes/a-n-islands-pin-code. 
  4. ↑ "STD Codes of Andaman and Nicobar". May 25, 2017. https://www.allcodesindia.in/stdcode/andaman+and+nicobar.php. 
  5. ↑ Registration Plate Numbers added to ISO Code
  6. ↑ Srivastava, Priya (2018-11-21). "All about Barren Island, South Asia's Only Active Volcano in Andaman". Times of India. https://timesofindia.indiatimes.com/travel/destinations/all-about-barren-island-south-asias-only-active-volcano-in-andaman/as66739617.cms. 
  7. ↑ Benjamin Elisha Sawe (15 March 2019). "Which Is The Only Active Volcano In South Asia?". https://www.worldatlas.com/articles/which-is-the-only-active-volcano-in-south-asia.html. 
  8. ↑ Dr. Aditi Jain. "Volcanic spewing in Barren Island is continuation of 2005 eruption". https://www.thehindubusinessline.com/news/science/volcanic-spewing-in-barren-island-is-continuation-of-2005-eruption-study/article22705451.ece. 
  9. ↑ Mishra, Rashmi. "List of Volcanoes in India: The only Indian live Volcano at Andaman & Nicobar Islands is Active again!". https://www.india.com/buzz/list-of-volcanoes-in-india-the-only-indian-live-volcano-at-andaman-nicobar-islands-is-active-again-1851944/. 
  10. ↑ 10.0 10.1 10.2 10.3 Koshy, Jacob (26 February 2017). "Why did Barren Island volcano erupt again?" (in en). http://www.thehindu.com/news/national/the-barren-islandvolcano-erupts-again/article17369862.ece. 
  11. ↑ "Barren Island". Smithsonian Institution. https://volcano.si.edu/volcano.cfm?vn=260010. 
  12. ↑ 12.0 12.1 Aabech, Jørgen S.. "Barren Island, Andaman Islands, Indian Ocean". http://www.vulkaner.no/v/volcan/submarin/barrenis.html. 
  13. ↑ Mallet, F.R. (1895). "Bibliography of Barren Island and Narcondam, from 1884 to 1894". Records of the Geological Survey of India 28: 34–38. https://archive.org/stream/recordsgeologic12indigoog#page/n46/mode/1up. 
  14. ↑ "Directorate General of Lighthouses and Lightships". http://dgllnoida.gov.in/anthaman/BARRAEN.html. 
  15. ↑ "NIO finds Andaman volcano spewing lava". http://timesofindia.indiatimes.com/city/goa/nio-finds-andaman-volcano-spewing-lava/articleshow/57214011.cms. 
  16. ↑ "India's only live volcano active again: National Institute of Oceanography" (in en). 18 February 2017. http://indianexpress.com/article/india/indias-only-live-volcano-active-again-nio-4531331/. 
  17. ↑ "Barren Island volcano, India's only live volcano, became active in January" (in en). 18 February 2017. http://www.hindustantimes.com/india-news/barren-island-volcano-india-s-only-live-volcano-become-active-again-in-January/story-QRFDzVzIsVn1QgV6HHo0cK.html. 
  18. ↑ Ray et al., Bull Volcanol 77: 57, 2015
  19. ↑ "Barren Island Volcano, Indian Ocean - facts & information". Volcanodiscovery.com. http://www.volcanodiscovery.com/barren_island.html. 
  20. ↑ "Global Volcanism Program - Barren Island". https://volcano.si.edu/volcano.cfm?vn=260010. 
  21. ↑ G. S. Mudur (3 August 2003). "Mystery that got science's goat - Barren Island puzzle solved: springs, not special kidneys, sustain animals" (in en). The Telegraph (Kolkata). https://www.telegraphindia.com/india/mystery-that-got-science-s-goat-barren-island-puzzle-solved-springs-not-special-kidneys-sustain-animals/cid/804481. 
  22. ↑ "Scientific Expedition to Barren Island (Andaman Islands, Indian Ocean)". 2003. http://www.geos.iitb.ac.in/dchandra/biexp/. 
  23. ↑ "Mystery that got science's goat - Barren Island puzzle solved: springs, not special kidneys, sustain animals". https://www.telegraphindia.com/india/mystery-that-got-science-s-goat-barren-island-puzzle-solved-springs-not-special-kidneys-sustain-animals/cid/804481. 
  24. ↑ "Barren Island Volcano with unique fauna" (in en). 2017-11-29. https://www.india.com/travel/articles/exploring-barren-island-indias-only-active-volcano-3227429/. 
  25. ↑ Krestovnikoff, Miranda; Halls, Monty (17 July 2006). Scuba Diving. DK Publishing. pp. 275–. ISBN 978-0-7566-4063-7. https://archive.org/details/scubadiving0000hall. 
  26. ↑ Pinto, Stanley (15 November 2013). "Scuba dive at an active volcano on Barren Island in Andamans". https://timesofindia.indiatimes.com/india/scuba-dive-at-an-active-volcano-on-barren-island-in-andamans/articleshow/25837581.cms. 
  27. ↑ "Village Code Directory: Andaman & Nicobar Islands". Census of India. http://www.censusindia.gov.in/2011-VillageDirectory/Directory/short_code_rural_35.pdf. 
  28. ↑ "Volcano news & eruption updates: Barren Island". https://www.volcanodiscovery.com/barren-island/news.html. 

External links



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