Skip to main content

Galunggung


Lightning strikes during the 1982 eruption of Galunggung
Mount Galunggung (Indonesian: Gunung Galunggung, formerly spelled Galoen-gong) is an active stratovolcano in West Java, Indonesia, around 80 km southeast of the West Java provincial capital, Bandung (or around 25 km to the east of the West Java town of Garut). Mt Galunggung is part of the Sunda Arc extending through Sumatra, Java and Bali, which has resulted from the subduction of the Indian oceanic plate and the Australian plate beneath the Eurasian plate.


Hazardous eruption of 1982
Main article: British Airways Flight 9

Galungung eruption of August 16, 1982
The last major eruption on Galunggung was in 1982, which had a Volcanic Explosivity Index of 4 and killed 68 people. This eruption also brought the dangers of volcanic ash to aviation to worldwide attention, after two Boeing 747 passenger jets flying downwind of the eruption suffered temporary engine failures and damage to exterior surfaces, both planes being forced to make emergency landings at Jakarta.

One, a British Airways aircraft carrying 240 passengers, accidentally entered the ash cloud during night time in June 1982 150 km downwind of the volcano. All four engines failed and the aircraft descended for 16 minutes, losing 7,500 metres of its 11,500-meter altitude, until the crew managed to restart the engines.

The following month a Singapore Airlines aeroplane with 230 passengers aboard also inadvertently entered the cloud at night time, and three of its four engines stopped. The crew succeeded in restarting one of the engines after descending 2,400 metres. Both aircraft suffered serious damage to their engines and exterior surfaces.

Avalanche deposits

A hummocky deposit known as the Ten Thousand Hills of Tasikmalaya attracted the attention of early 20th century geologists. Houses were built on the hummocks since they provided good defence against hostile people, and being above the paddy fields were free of mosquitoes and rats.

Originally, it was thought that either it had been formed by a lahar caused by the release of the waters of the crater lake, or that it was man-made; composed of rocks and boulders dumped there after being cleared from paddy fields.

However, in the light of the Mount St. Helens eruption of 1980 and from examination of the Mount Shasta deposits it has become clear that the hummocks are a debris-avalanche deposit. Like these mountains, Galunggung has a horseshoe-shaped crater indicating a massive landslide, and examination of shattered lava blocks revealed them to be similar to deposits on the other two volcanoes. According to radiocarbon dating of samples taken from a lava flow the landslide happened within the last 23,000 years.
Labels:

Comments

Post a Comment

Popular posts from this blog

The Largest Islands in Indonesia: From Largest to Smallest

Indonesia, an archipelago in Southeast Asia, is the world's largest island country, consisting of more than 17,000 islands. These islands vary greatly in size, from massive landmasses like Sumatra and Borneo to tiny islets scattered across the oceans. Here's a detailed look at the largest islands in Indonesia, ranked from the largest to the smallest. 1. New Guinea (Papua) Area : Approximately 785,753 square kilometers (Indonesian portion: 421,981 square kilometers) Description : New Guinea, known as Papua in Indonesia, is the second-largest island in the world after Greenland. It is shared between Indonesia and Papua New Guinea. The Indonesian part comprises the provinces of Papua, West Papua, South Papua, Central Papua, and Highland Papua. The island is famous for its diverse cultures and rich biodiversity, with dense rainforests, rugged mountain ranges, and a significant number of endemic species. 2. Borneo (Kalimantan) Area : Approximately 748,168 square kilometers (Indonesi...
Post a Comment
Read more

Batik

Batik (Javanese-Indonesian-Malay pronunciation: ['ba.te'], but often, in English, is [bætik] or [ba'ti'k]) is an Indonesian word and refers to a generic wax-resist dyeing technique used on textile. The word originates from Javanese word "amba", meaning ”to write” and the Javanese word for dot or point, "titik." It is known to be more than a millennium old, probably in ancient Egypt or Sumeria. There are evidences that cloth decorated through some form of resist technique was in use in the early centuries AD. It is found in several countries later in West Africa such as Nigeria, Cameroon and Mali, or in Asia, such as India, Sri Lanka, Iran, and Thailand, and Malaysia, but the most popular are in Indonesia. The art of Batik reach its highest achievement in technique, intricate design, and refined aesthetic in Java, Indonesia. The island of Java itself is famous and well known for its exquisite batik for centuries, particularly in places suc...
Post a Comment
Read more

Indonesia, The World's Largest Archipelago

Indonesia Flag Indonesia , the world's largest archipelago, boasts of having one of the best biodiversity levels. It ranks second next to Brazil. This means that there is an intense mixture of floral and fauna, usually bearing Australasian and Asian ancestry. The country is used to be connected to the mainland of Asia. There are a lot of islands that comprise the country, and majority of them are filled with sun-kissed beaches, beautiful and majestic coral reefs, and plenty of different species of fish and other marine creatures. That's why besides immersing yourself into the history and culture of its people, sailing in Indonesia is a popular activity that you can look forward to.
Post a Comment
Read more