The 1979 Bali earthquake occurred at with a surface wave magnitude of 6.3. The shock occurred southeast of the coast of

Karangasem Regency Karangasem Regency (Indonesian: ''Kabupaten Karangasem'') is a regency (''kabupaten'') of Bali, Indonesia. It covers the east part of Bali, has an area of 839.54 km2 and had a population of 396,487 at the 2010 Census which rose to 492,402 ...

in the

Lombok Strait The Lombok Strait ( id, Selat Lombok), is a strait connecting the Java Sea to the Indian Ocean, and is located between the islands of Bali and Lombok in Indonesia. The Gili Islands are on the Lombok side. Its narrowest point is at its southern ...

, and about east-northeast of

Denpasar Denpasar (; Balinese: ᬤᬾᬦ᭄ᬧᬲᬃ) is the capital of Bali and the main gateway to the island. The city is also a hub for other cities in the Lesser Sunda Islands. With the rapid growth of the tourism industry in Bali, Denpasar has e ...

. Up to 80 percent of the buildings in

were damaged, between 15,000 and 500,000 people were displaced, and road links to the provincial capital of

were briefly severed.

Tectonic setting

The island of Bali forms part of the Sunda Arc, which formed above the

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

where the

Australian Plate The Australian Plate is a major tectonic plate in the eastern and, largely, southern hemispheres. Originally a part of the ancient continent of Gondwana, Australia remained connected to India and Antarctica until approximately when India broke ...

subducting 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 ...

beneath the Sunda Plate. The rate of convergence across the line of the Sunda–Java Trench is 7.5 cm per year. Eastwards from Bali, the Sunda Arc is also being thrust over the Bali and Flores back-arc basins on a series of south-dipping thrusts. Focal mechanisms for earthquakes near Bali are dominantly thrust sense on both the subduction interface and the system of thrust faults to the north. A previous earthquake of 6.5 M_s north of the

Buleleng Buleleng ( ban, ᬓᬩᬸᬧᬢᬾᬦ᭄ᬩᬸᬮᭂᬮᭂᬂ, Kabupatén Buléléng) is a regency (''kabupaten'') of Bali, Indonesia. It has an area of 1,365.88 km2 and population of 624,125 at the 2010 census and 791,910 at the 2020 cen ...

coast on 14 July 1976 caused 573 deaths on Bali and displaced a similar number of people.

Earthquake

A previous shock of 6.2 M_s on 20 October affected Mataram, the capital of the neighboring island

Lombok Lombok is an island in West Nusa Tenggara province, Indonesia. It forms part of the chain of the Lesser Sunda Islands, with the Lombok Strait separating it from Bali to the west and the Alas Strait between it and Sumbawa to the east. It is ...

, and damaged hundreds of buildings on that island as well as many on Bali. Two people were killed, including a 3-year-old boy in

and a pregnant mother at a hospital in

. The epicenter of the 20 October temblor was approximately north-northeast of the 17 December temblor. According to the

United States Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, ...

(USGS), the 18 December shock occurred east-northeast of

at a depth of . Initial reports by local observers suggested the epicenter may have been beneath the

Mount Agung Mount Agung ( id, Parwata Agung; ban, ᬕᬦ ᬆᬕ) is an active volcano in Bali, Indonesia, southeast of Mount Batur volcano, also in Bali. It is the highest point on Bali, and dominates the surrounding area, influencing the climate, especiall ...

stratovolcano, however

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

n authorities confirmed the location in the

. The shock was felt along the eastern coast of

, although no significant damage was caused there. As the temblor occurred during the early hours of the morning, there was significant panic; residents are reported to have fled to open fields and

beach A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc., or biological sources, such as mollusc sh ...

es for the rest of the night.

Damage

Eighty percent of the homes and other buildings in

were reported to have been destroyed or damaged. Approximately eighty thousand homes were destroyed, as well as 40

Hindu Hindus (; ) are people who religiously adhere to Hinduism. Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...

temples A temple (from the Latin ) is a building reserved for spiritual rituals and activities such as prayer and sacrifice. Religions which erect temples include Christianity (whose temples are typically called churches), Hinduism (whose temples ...

, 17

market Market is a term used to describe concepts such as: *Market (economics), system in which parties engage in transactions according to supply and demand *Market economy *Marketplace, a physical marketplace or public market Geography *Märket, an ...

s, 8

school A school is an educational institution designed to provide learning spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes comp ...

s, several

mosque A mosque (; from ar, مَسْجِد, masjid, ; literally "place of ritual prostration"), also called masjid, is a place of prayer for Muslims. Mosques are usually covered buildings, but can be any place where prayers ( sujud) are performed, ...

s and a

public hospital A public hospital, or government hospital, is a hospital which is government owned and is fully funded by the government and operates solely off the money that is collected from taxpayers to fund healthcare initiatives. In some countries, this typ ...

. The villages of ''Culik, Datah'' and ''Tisla'' were reportedly left uninhabitable due to catastrophic damage.

Relief efforts

The Indonesian Army established eleven temporary barracks in the affected region to assist those displaced. The Governor's office delivered at least 25 tonnes of

rice Rice is the seed of the grass species '' Oryza sativa'' (Asian rice) or less commonly ''Oryza glaberrima'' (African rice). The name wild rice is usually used for species of the genera '' Zizania'' and '' Porteresia'', both wild and domesticat ...

to the displaced residents.

References

External links