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A caldera is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the structural integrity of such a chamber, greatly diminishing its capacity to support its own roof, and any substrate or rock resting above. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface. Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur over the course of a century, the formation of a caldera is a rare event, occurring only a few times within a given window of 100 years. Only eight caldera-forming collapses are known to have occurred between 1911 and 2018, with a caldera collapse at Kīlauea, Hawaii in 2018. Volcanoes that have formed a caldera are sometimes described as "caldera volcanoes".
Mount Merapi is an active stratovolcano located on the border between the province of Central Java and the Special Region of Yogyakarta, Indonesia. It is the most active volcano in Indonesia and has erupted regularly since 1548. It is located approximately 28 km (17 mi) north of Yogyakarta city which has a population of 2.4 million. Thousands of people live on the flanks of the volcano, with villages as high as 1,700 m (5,577 ft) above sea level.
Mount Agung 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, especially rainfall patterns. From a distance, the mountain appears to be perfectly conical. From the peak of the mountain, it is possible to see the peak of Mount Rinjani on the nearby island of Lombok, to the east, although both mountains are frequently covered in clouds. Agung is a stratovolcano, with a large and deep crater. Its most recent eruptions occurred from 2017–2019.
The Sunda Arc is a volcanic arc that produced the volcanoes that form the topographic spine of the islands of Sumatra, Nusa Tenggara, Java, the Sunda Strait, and the Lesser Sunda Islands. The Sunda Arc begins at Sumatra and ends at Flores, and is adjacent to the Banda Arc. The Sunda Arc is formed via the subduction of the Indo-Australian Plate beneath the Sunda and Burma plates at a velocity of 63–70 mm/year.
Mount Batur(Gunung Batur) is an active volcano located at the center of two concentric calderas northwest of Mount Agung on the island of Bali, Indonesia. The southeast side of the larger 10×13 km caldera contains a caldera lake. Both the larger caldera, and a smaller 7.5 km caldera were formed by a collapse of the magma chamber, the first larger collapse taking place about 29,300 years ago, and the second inner caldera collapsing about 20,150 years ago. Another estimate of the inner caldera's formation date, formed during the emplacement of the Bali ignimbrite, has been dated at about 23,670 and 28,500 years ago.
Anak Krakatau is a volcanic island in Indonesia. On 29 December 1927, Anak Krakatau first emerged from the caldera formed in 1883 by the explosive volcanic eruption that destroyed the island of Krakatoa. There has been sporadic eruptive activity at the site since the late 20th century, culminating in a large underwater collapse of the volcano, which caused a deadly tsunami in December 2018. There has been subsequent activity since. Owing to its young age the island is one of several in the area that are of interest to, and the subject of extensive study by volcanologists.
A somma volcano, also known as a sommian, is a volcanic caldera that has been partially filled by a new central cone. The type is named after Mount Somma ("Summit"), a stratovolcano in southern Italy with a summit caldera in which the upper cone of Mount Vesuvius has grown. Other examples of somma volcanoes can be found on Russia's Kamchatka Peninsula and the Kuril Islands, stretching south from Kamchatka to Hokkaidō, Japan.
Mount Merbabu is a dormant stratovolcano in Central Java province on the Indonesian island of Java. The name Merbabu could be loosely translated as 'Mountain of Ash' from the Javanese combined words; Meru means "mountain" and awu or abu means "ash".
The Sidoarjo mud flow is the result of an erupting mud volcano in the subdistrict of Porong, Sidoarjo in East Java, Indonesia that has been in eruption since May 2006. It is the biggest mud volcano in the world; responsibility for the disaster was assigned to the blowout of a natural gas well drilled by PT Lapindo Brantas, although company officials contend it was caused by a very distant earthquake that occurred in a different province.
Several types of volcanic eruptions—during which material is expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series.
Gunung is the Malay and Indonesian word for mountain —it is regularly used in volcano and mountain names throughout Southeast Asia.
Pura Ulun Danu Batur is a Hindu Balinese temple located on the island of Bali, Indonesia. As one of the Pura Kahyangan Jagat, Pura Ulun Danu Batur is one of the most important temples in Bali which acted as the maintainer of harmony and stability of the entire island. Pura Ulun Danu Batur represents the direction of the North and is dedicated to the god Vishnu and the local goddess Dewi Danu, goddess of Lake Batur, the largest lake in Bali. Following the destruction of the original temple compound, the temple was relocated and rebuilt in 1926. The temple, along with 3 other sites in Bali, form the Cultural Landscape of Bali Province which was inscribed as a World Heritage Site by UNESCO in 2012.
Kintamani is a district (kecamatan), and a village within that district, on the western edge of the larger caldera wall of the Mount Batur caldera in Bali, Indonesia. It is on the same north–south road as Penelokan and has been used as a stopping place to view the Mount Batur region. Kintamani is also known for Pura Tuluk Biyu's 1,000-year-old "Rites of Peace" stone tablets and the Kintamani dog breed. It is situated next to Mount Batur. Kintamani many inhabited by native Balinese people, Bali Aga.
Baturraden is a district in the Banyumas Regency on the slope of Mount Slamet, Central Java, Indonesia. It features panoramic views, waterfalls, a mini-train, paddleboats, a water slide, and a pool. Its name is derived from a legend about star-crossed lovers, a manservant (Batur) and a noblewoman (Raden).
Mount Sunda was an ancient volcano that once stood in Priangan highlands in today's West Java province, Java island, Indonesia. The Sunda volcano existed during the Pleistocene age before a violent Plinian eruption caused its summit to collapse. The volcano formed the northern ridge of the Bandung Basin. The ancient volcano is the predecessor of today's Tangkuban Perahu, Burangrang, and Bukit Tunggul volcanoes.
Lake Batur is a volcanic crater lake in Kintamani, Bali, Bangli Regency of Bali, located about 30 km (19 mi) northeast of Ubud in Bali. The lake is inside of the caldera of an active volcano, Mount Batur, located along the Ring of Fire of volcanic activity.
The 2021 Bali earthquake struck at 04:18 local time (UTC+08:00) when people were still sleeping on 15 October 2021. It resulted in 4 deaths and 73 more injured, despite having a moment magnitude of 4.7.
Lake Dringo is a volcanic crater lake located in Pekasiran, Batur, Banjarnegara, Central Java, Indonesia. It was formed from the eruption of Dringo volcano in 1786.
References
- 1 2 Geiger, Harri; Troll, Valentin R.; Jolis, Ester M.; Deegan, Frances M.; Harris, Chris; Hilton, David R.; Freda, Carmela (2018-07-12). "Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions". Scientific Reports. 8 (1): 10547. doi: 10.1038/s41598-018-28125-2 . ISSN 2045-2322. PMC 6043508 . PMID 30002471.
- ↑ Desy Nurhayati (11 November 2009). "Mt. Batur alert raised to 'caution'". Jakarta Post. Retrieved January 16, 2016.