The 1941 Andaman Islands earthquake struck the

Andaman Islands The Andaman Islands () are an archipelago in the northeastern Indian Ocean about southwest off the coasts of Myanmar's Ayeyarwady Region. Together with the Nicobar Islands to their south, the Andamans serve as a maritime boundary between th ...

on June 26 with a magnitude of 7.7 to 8.1. Details of this event are poorly known as much of Southeast Asia was in the turmoil of

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. The quake caused severe damage in the Andaman Islands. The tsunami it triggered was reported along the

Andaman and Nicobar Islands The Andaman and Nicobar Islands is a union territory of India consisting of 572 islands, of which 37 are inhabited, at the junction of the Bay of Bengal and the Andaman Sea. The territory is about north of Aceh in Indonesia and separated f ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

and

British Ceylon British Ceylon ( si, බ්‍රිතාන්‍ය ලංකාව, Britānya Laṃkāva; ta, பிரித்தானிய இலங்கை, Biritthāṉiya Ilaṅkai) was the British Crown colony of present-day Sri Lanka between ...

(now known as

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

). There may have been damage and deaths in

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

, and

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...

due to the tsunami.

Effects

The earthquake partially collapsed

Cellular Jail The Cellular Jail, also known as Kālā Pānī (), was a British colonial prison in the Andaman and Nicobar Islands. The prison was used by the British Raj, colonial government of India for the purpose of Penal transportation, exiling crimina ...

and destroyed other masonry buildings at

Port Blair Port Blair () is the capital city of the Andaman and Nicobar Islands, a union territory of India in the Bay of Bengal. It is also the local administrative sub-division (''tehsil'') of the islands, the headquarters for the district of South An ...

. Ground slumping,

soil liquefaction Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in ...

and

sand volcano Sand boils or sand volcanoes occur when water under pressure wells up through a bed of sand. The water looks like it is boiling up from the bed of sand, hence the name. Sand volcano A sand volcano or sand blow is a cone of sand formed by the ...

es were reported. Roads, bridges, embankments,

seawall A seawall (or sea wall) is a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms of the coast. The purpose of a seawall is to protect areas of human habitation, conservation ...

s and jetties were seriously damaged. Large

fissure A fissure is a long, narrow crack opening along the surface of Earth. The term is derived from the Latin word , which means 'cleft' or 'crack'. Fissures emerge in Earth's crust, on ice sheets and glaciers, and on volcanoes. Ground fissure A ...

s occurred in the ground. Large trees were tilted and uprooted. According to eyewitness accounts, these trees fell in a westernly direction. There was an unspecified number of deaths only described as "few". Shaking was felt over a very wide area; felt reports also came from

Colombo Colombo ( ; si, කොළඹ, translit=Koḷam̆ba, ; ta, கொழும்பு, translit=Koḻumpu, ) is the executive and judicial capital and largest city of Sri Lanka by population. According to the Brookings Institution, Colombo me ...

Chennai Chennai (, ), formerly known as Madras ( the official name until 1996), is the capital city of Tamil Nadu, the southernmost Indian state. The largest city of the state in area and population, Chennai is located on the Coromandel Coast of th ...

Kolkata Kolkata (, or , ; also known as Calcutta , the official name until 2001) is the capital of the Indian state of West Bengal, on the eastern bank of the Hooghly River west of the border with Bangladesh. It is the primary business, comme ...

and

Mumbai Mumbai (, ; also known as Bombay — the official name until 1995) is the capital city of the Indian state of Maharashtra and the ''de facto'' financial centre of India. According to the United Nations, as of 2018, Mumbai is the second- ...

. Islands located in a passage between

Little Andaman Little Andaman Island (Onge: ''Gaubolambe'') is the fourth largest of the Andaman Islands of India with an area of 707 km2, lying at the southern end of the archipelago. It belongs to the South Andaman administrative district, part of the I ...

and

South Andaman Island South Andaman Island is the southernmost island of the Great Andaman and is home to the majority of the population of the Andaman Islands. It belongs to the South Andaman administrative district, part of the Indian union territory of Andaman and ...

s subsided by over .

Tsunami

Although no

tide gauge A tide gauge is a device for measuring the change in sea level relative to a vertical datum. It its also known as mareograph, marigraph, sea-level recorder and limnimeter. When applied to freshwater continental water bodies, the instrument may ...

s existed, the estimated tsunami heights were to along the east coast of India. It is claimed that 5,000 drowned in India but no reliable attribution for such figure exists. News reports misattributed these deaths with a storm surge, while the

Times of India ''The Times of India'', also known by its abbreviation ''TOI'', is an Indian English language, English-language daily newspaper and digital news media owned and managed by The Times Group. It is the List of newspapers in India by circulation, t ...

did not mention a tsunami while reporting the event. No news or scientific reports made mention of a large death toll from the tsunami. It was also unlikely that a tsunami could result in a high death toll. Reports of the tsunami effects along the Andaman Islands also did not mention any fatalities.

Geology

The earthquake occurred in a

convergent boundary A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more Plate tectonics, lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. The subduction zone can ...

zone that separates the

Indian Plate The Indian Plate (or India Plate) is a minor tectonic plate straddling the equator in the Eastern Hemisphere. Originally a part of the ancient continent of Gondwana, the Indian Plate broke away from the other fragments of Gondwana , began mov ...

from the

Burma Plate The Burma Plate is a minor tectonic plate or microplate located in Southeast Asia, sometimes considered a part of the larger Eurasian Plate. The Andaman Islands, Nicobar Islands, and northwestern Sumatra are located on the plate. This island arc ...

. The Indian Plate subducts obliquely beneath the Burma Plate at a rate of 6.7 cm/year. It was previously assigned a magnitude of 8.1 to 8.7. The International Seismological Centre assigned this event as having a moment magnitude of 8.0. Further research suggest the earthquake did not occur as a result of rupturing the

subduction zone Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...

, rather, it was a normal-faulting intraslab earthquake located within the Indian Plate beneath the islands.

References

Sources
Earthquake and tsunami of June 25, 1941 in the Andaman Sea and the Bay of Bengal
– George Pararas-Carayannis

–

Lamont–Doherty Earth Observatory The Lamont–Doherty Earth Observatory (LDEO) is the scientific research center of the Columbia Climate School, and a unit of The Earth Institute at Columbia University. It focuses on climate and earth sciences and is located on a 189-acre (64 h ...

External links

* {{Earthquakes in India

1941 Events Below, the events of World War II have the "WWII" prefix. January * January–August – 10,072 men, women and children with mental and physical disabilities are asphyxiated with carbon monoxide in a gas chamber, at Hadamar Eu ...

1940s tsunamis 1941 earthquakes 1941 in India History of the Andaman and Nicobar Islands Tsunamis in India Tsunamis in Thailand Tsunamis in Myanmar 1941 in Burma 1941 in Thailand 1941 disasters in India

Effects

Tsunami

Geology

See also

References

External links