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41-569: Mount Salak is a stratovolcano with its last recorded eruption in January 1938. On October 10, 2018, there was a false alarm, as the VAAC in Darwin said that there was a sudden eruption and that an ash plume from the volcano had risen to 15 km , or 50,000 feet . It was eventually determined that no eruption had taken place. The complex area of Mount Salak serves as the headwater for two river basins and acts as

82-747: A 4-inch thick ash layer can weigh 120-200 pounds and can get twice as heavy when wet. Wet ash also poses a risk to electronics due to its conductive nature. Dense clouds of hot volcanic ash can be expelled due to the collapse of an eruptive column , or laterally due to the partial collapse of a volcanic edifice or lava dome during explosive eruptions . These clouds are known as pyroclastic surges and in addition to ash , they contain hot lava , pumice , rock , and volcanic gas . Pyroclastic surges flow at speeds over 50 mph and are at temperatures between 200 °C – 700 °C. These surges can cause major damage to property and people in their path. Lava flows from stratovolcanoes are generally not

123-672: A boundary between basins that flow towards the northern and southern coasts of Java. The Cisadane River Basin directs its flow towards the northern coast of Java and flows into the Java Sea, while the Cimandiri River Basin directs its flow towards the southern coast of Java and flows into Pelabuhan Ratu Bay in the waters of the Indian Ocean. Compared to the Cimandiri River Basin, the Cisadane River Basin encompasses more than 50% of

164-591: A crash of a training aircraft not long before the SSJ-100 crash , which occurred on May 9, 2012, when a Sukhoi Superjet 100 crashed into the mountain during a demonstration flight, killing all 45 people on board. [REDACTED] Media related to Mount Salak at Wikimedia Commons Stratovolcano A stratovolcano , also known as a composite volcano , is a conical volcano built up by many alternating layers ( strata ) of hardened lava and tephra . Unlike shield volcanoes , stratovolcanoes are characterized by

205-474: A fast moving mudflow . Lahars are typically about 60% sediment and 40% water. Depending on the abundance of volcanic debris the lahar can be fluid or thick like concrete. Lahars have the strength and speed to flatten structures and cause great bodily harm, gaining speeds up to dozens of kilometers per hour. In the 1985 eruption of Nevado del Ruiz in Colombia , Pyroclastic surges melted snow and ice atop

246-515: A final intermediate composition . When the magma nears the top surface, it pools in a magma chamber within the crust below the stratovolcano. The processes that trigger the final eruption remain a question for further research. Possible mechanisms include: These internal triggers may be modified by external triggers such as sector collapse , earthquakes , or interactions with groundwater . Some of these triggers operate only under limited conditions. For example, sector collapse (where part of

287-739: A result of intraplate volcanism on oceanic islands far from plate boundaries. Examples are Teide in the Canary Islands , and Pico do Fogo in Cape Verde . Stratovolcanoes in the East African Rift include Ol Doinyo Lengai in Tanzania, and Longonot in Kenya. Subduction zone volcanoes form when hydrous minerals are pulled down into the mantle on the slab. These hydrous minerals, such as chlorite and serpentine , release their water into

328-461: A significant threat to humans or animals because the highly viscous lava moves slowly enough for everyone to evacuate. Most deaths attributed to lava are due to related causes such as explosions and asphyxiation from toxic gas . Lava flows can bury homes and farms in thick volcanic rock which greatly reduces property value. However, not all stratovolcanoes erupt viscous and sticky lava . Nyiragongo , near Lake Kivu in central Africa ,

369-552: A steep profile with a summit crater and explosive eruptions. Some have collapsed summit craters called calderas . The lava flowing from stratovolcanoes typically cools and solidifies before spreading far, due to high viscosity . The magma forming this lava is often felsic , having high to intermediate levels of silica (as in rhyolite , dacite , or andesite ), with lesser amounts of less viscous mafic magma . Extensive felsic lava flows are uncommon, but can travel as far as 8 km (5 mi). The term composite volcano

410-547: A trunk in a crosswise fashion, making little flights so as to turn to face the other way, the several members of a group often working in synchrony. The diet consists of ants , their larvae, termites , small beetles , spiders and other small invertebrates . In Borneo the breeding season is in February while in Malaysia, nestlings have been found in May and June. Sometimes the nest is in

451-452: Is "the back way" through Cidahu, Sukabumi , and Kawah Ratu near Bunder Mount. Mount Salak is popular for many mountain climbing clubs, especially Route II, because of the difficulty involved in reaching the peak. Climbers bring water with them, especially through Post I at Kawah Ratu Route. A water source, supplied by rain, exists at an altitude of 2,211 m (7,254 ft) on this route. Cimelati can be reached from Cibuntu Village. Water

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492-527: Is a passive release of gas during periods of dormancy. As per the above examples, while eruptions like Mount Unzen have caused deaths and local damage, the impact of the June 1991 eruption of Mount Pinatubo was seen globally. The eruptive columns reached heights of 40 km and dumped 17 megatons of SO 2 into the lower stratosphere . The aerosols that formed from the sulfur dioxide (SO 2 ), carbon dioxide (CO 2 ), and other gases dispersed around

533-546: Is a species of bird in the family Picidae . It is found in Brunei , Indonesia , Malaysia , Myanmar , and Thailand . Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests . This species is one of the world's smallest woodpeckers and is the smallest woodpecker found outside the Americas . In this species the length can range from 8 to 10 cm (3 to 4 in) and

574-496: Is blackish above, edged with olive. The sexes are different; the male has a yellow or golden patch on the forehead whereas the female has a bronze patch. They also differ in that the female has a larger beak. The upper mandible in both sexes is blackish and the lower mandible yellowish. The iris is reddish and there is a pinkish or purplish ring of bare skin around the eye. The legs and feet are yellowish or orange, and this piculet has just three toes on each foot, (four being normal in

615-518: Is dense humid secondary forests with tangled undergrowth, vines, creepers, bamboos and dead and rotting trees, often near streams. The rufous piculet is an active bird moving singly or in small groups through the lowest storeys of the forest, usually not above 5 m (16 ft) from the ground. It forages on trunks and dead branches, on vines, in bushes, among bamboos and in tall grasses. It gleans scrupulously, probing into holes and pulling out insects with its long tongue. It sometimes works its way up

656-632: Is scarce in parts of this region. An irrigation system ensures that water is plentiful until Post/Shelter III. Beyond this point, travelers must carry water. The route itself is scenic, with several waterfalls as well as a large villa appearing before reaching Post/Shelter I. Mount Salak is a habitat for a variety of animal species, including frogs, toads, reptiles, birds, and mammals. During research, D. M. Nasir (2003) from KSH forest faculty IPB found 11 frog and toad species in Lingkungan S (Environment S) at Ciapus Leutik, Desa Taman Sari, Bogor Residency. They are

697-451: Is the most famous example of a hazardous stratovolcano eruption. It completely smothered the nearby ancient cities of Pompeii and Herculaneum with thick deposits of pyroclastic surges and pumice ranging from 6–7 meters deep. Pompeii had 10,000-20,000 inhabitants at the time of eruption. Mount Vesuvius is recognized as one of the most dangerous of the world's volcanoes, due to its capacity for powerful explosive eruptions coupled with

738-450: Is typically between 700 and 1,200 °C (1,300-2,200 °F). Volcanic bombs are masses of unconsolidated rock and lava that are ejected during an eruption. Volcanic bombs are classified as larger than 64mm (2.5 inches). Anything below 64mm is classified as a volcanic block . When erupted Bombs are still molten and partially cool and solidify on their descent. They can form ribbon or oval shapes that can also flatten on impact with

779-990: Is used because the strata are usually mixed and uneven instead of neat layers. They are among the most common types of volcanoes; more than 700 stratovolcanoes have erupted lava during the Holocene Epoch (the last 11,700 years), and many older, now extinct, stratovolcanoes erupted lava as far back as Archean times. Stratovolcanoes are typically found in subduction zones but they also occur in other geological settings. Two examples of stratovolcanoes famous for catastrophic eruptions are Krakatoa in Indonesia (which erupted in 1883 claiming 36,000 lives) and Mount Vesuvius in Italy (which erupted in 79 A.D killing an estimated 2,000 people). In modern times, Mount St. Helens (1980) in Washington State , US, and Mount Pinatubo (1991) in

820-403: Is very dangerous because its magma has an unusually low silica content , making it much less viscous than other stratovolcanoes. Low viscosity lava can generate massive lava fountains , while lava of thicker viscosity can solidify within the vent, creating a volcanic plug . Volcanic plugs can trap gas and create pressure in the magma chamber, resulting in violent eruptions. Lava

861-699: The Asian giant toad , the Asian common toad , the Java spadefoot toad , the Indian cricket frog , Huia masonii , Limnonectes kuhlii , Limnonectes macrodon , Limnonectes microdiscus , Rana chalconota , Rana erythraea , and Rana hosii . The findings did not include tree toads and other mountain toads that might also be found there. At Cidahu, bangkong bertanduk ( Megophrys montana ) and katak terbang ( Rhacophorus reinwardtii ) were found. Many reptiles, including lizards and snakes, live on Mount Salak. These include

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902-573: The Philippines have erupted catastrophically, but with fewer deaths. Stratovolcanoes are common at subduction zones , forming chains and clusters along plate tectonic boundaries where an oceanic crust plate is drawn under a continental crust plate (continental arc volcanism, e.g. Cascade Range , Andes , Campania ) or another oceanic crust plate ( island arc volcanism, e.g. Japan , Philippines , Aleutian Islands ). Stratovolcanoes also occur in some other geological settings, for example as

943-891: The magma is too viscous to allow easy escape of volcanic gases . As a consequence, the tremendous internal pressures of the trapped volcanic gases remain and intermingle in the pasty magma . Following the breaching of the vent and the opening of the crater, the magma degasses explosively. The magma and gases blast out with high speed and full force. Since 1600 CE , nearly 300,000 people have been killed by volcanic eruptions . Most deaths were caused by pyroclastic flows and lahars , deadly hazards that often accompany explosive eruptions of subduction-zone stratovolcanoes. Pyroclastic flows are swift, avalanche-like, ground-sweeping, incandescent mixtures of hot volcanic debris, fine ash , fragmented lava , and superheated gases that can travel at speeds over 150 km/h (90 mph). Around 30,000 people were killed by pyroclastic flows during

984-443: The mantle which decreases its melting point by 60 to 100 °C. The release of water from hydrated minerals is termed " dewatering ", and occurs at specific pressures and temperatures for each mineral, as the plate descends to greater depths. This allows the mantle to partially melt and generate magma . This is called flux melting . The magma then rises through the crust , incorporating silica-rich crustal rock, leading to

1025-607: The 1902 eruption of Mount Pelée on the island of Martinique in the Caribbean . During March and April 1982, El Chichón in the State of Chiapas in southeastern Mexico , erupted 3 times, causing the worst volcanic disaster in that country's history and killied more than 2,000 people in pyroclastic flows . Two Decade Volcanoes that erupted in 1991 provide examples of stratovolcano hazards. On 15 June, Mount Pinatubo erupted and caused an ash cloud to shoot 40 km (25 mi) into

1066-481: The 1982 eruption of Galunggung in Java , British Airways Flight 9 flew into the ash cloud, causing it to sustain temporary engine failure and structural damage. Although no crashes have happened due to ash, more than 60, mostly commercial aircraft , have been damaged. Some of these incidents resulted in emergency landings. Ashfalls are a threat to health when inhaled and are also a threat to property. A square yard of

1107-585: The 5,321 m (17,457 ft) high Andean volcano. The ensuing lahar killed 25,000 people and flooded the city of Armero and nearby settlements. As a volcano forms, several different gases mix with magma in the volcanic chamber. During an eruption the gases are then released into the atmosphere which can lead to toxic human exposure. The most abundant of these gases is H 2 O ( water ) followed by CO 2 ( carbon dioxide ), SO 2 ( sulfur dioxide ), H 2 S ( hydrogen sulfide ), and HF ( hydrogen fluoride ). If at concentrations of more than 3% in

1148-816: The air, when breathed in CO 2 can cause dizziness and difficulty breathing. At more than 15% concentration CO 2 causes death. CO 2 can settle into depressions in the land, leading to deadly, odorless pockets of gas. SO 2 classified as a respiratory, skin, and eye irritant if come into contact with. It is known for its pungent egg smell and role in ozone depletion and has the potential to cause acid rain downwind of an eruption. H 2 S has an even stronger odor than SO 2 as well as being even more toxic. Exposure for less than an hour at concentrations of over 500 ppm causes death. HF and similar species can coat ash particles and once deposited can poison soil and water. Gases are also emitted during volcanic degassing, which

1189-741: The air. It produced large pyroclastic surges and lahar floods that caused a lot of damage to the surrounding area. Pinatubo , located in Central Luzon just 90 km (56 mi) west-northwest of Manila , had been dormant for six centuries before the 1991 eruption. This eruption was one of the 2nd largest in the 20th century. It produced a large volcanic ash cloud that affected global temperatures, lowering them in areas as much as .5 °C. The volcanic ash cloud consisted of 22 million tons of SO 2 which combined with water droplets to create sulfuric acid . In 1991 Japan's Unzen Volcano also erupted, after 200 years of inactivity. It's located on

1230-437: The average body mass is around 9.2 g (0.32 oz). The rufous piculet is a very small bird with short wings and an almost non-existent tail, ranging in length from 8 to 10 cm (3 to 4 in). The upper parts are generally green tinted with bronze, and the underparts rufous, orange or cinnamon, with paler flanks. The mantle and back are olive, the wings are brownish above, and the underwings are buff. The stumpy tail

1271-597: The catchment area on the northern slope, as well as parts of the eastern and western slopes of the Mount Salak complex, located in the Bogor Regency. Mount Salak offers several routes for climbing. The route most often climbed is Curug Nangka, in the northern part of the range. Peak I is visited via easier routes from the east, through Cimelati and Cicurug. Peak I also can be reached by more challenging routes, from Peak II via Sukamantri and Ciapus. An additional alternate route

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1312-1181: The chameleons Bronchocela jubata , Bronchocela cristatella , Kadal Kebun ( Mabuya multifasciata ), and Biawak Sungai ( Varanus salvator ). Some snakes living in Mount Salak are Ular Tangkai ( Calamaria sp. ), Ular Siput ( Pareas carinatus ), Ular Sanca Kembang ( Python reticulatus ), and many more. Mount Salak has become famous for its habitat for birds; there are at least 232 birds species in total. The most notable birds are Elang Jawa ( Spizaetus bartelsi ), Crested Serpent Eagle ( Spilornis cheela ), Ayam Hutan Merah ( Gallus gallus ), Cuculus micropterus , Phaenicophaeus javanicus , Phaenicophaeus curvirostris , Sasia abnormis , Dicrurus remifer , Cissa thalassina , Crypsirina temia , Burung Kuda ( Garrulax rufifrons ), Hypothymis azurea , Aethopyga eximia , Aethopyga mystacalis , and Lophozosterops javanicus . The notes about mammals indicate that there are not many living on Mount Salak, aside from leopards , silvery gibbons , Javan surilis , and sunda pangolins . In 2012, The Jakarta Post dubbed Mount Salak an "airplane graveyard". High turbulence and fast-changing weather conditions of

1353-540: The flank of a volcano collapses in a massive landslide) can only trigger the eruption of a very shallow magma chamber . Magma differentiation and thermal expansion also are ineffective as triggers for eruptions from deep magma chambers . In recorded history , explosive eruptions at subduction zone ( convergent-boundary ) volcanoes have posed the greatest hazard to civilizations. Subduction-zone stratovolcanoes, such as Mount St. Helens , Mount Etna and Mount Pinatubo , typically erupt with explosive force because

1394-478: The ground. Volcanic Bombs are associated with Strombolian and Vulcanian eruptions and basaltic lava . Ejection velocities ranging from 200 to 400 m/s have been recorded causing volcanic bombs to be destructive. Lahars (from a Javanese term for volcanic mudflows) are a mixture of volcanic debris and water. Lahars can result from heavy rainfall during or before the eruption or interaction with ice and snow. Meltwater mixes with volcanic debris causing

1435-458: The high population density of the surrounding Metropolitan Naples area (totaling about 3.6 million inhabitants). In addition to potentially affecting the climate, volcanic ash clouds from explosive eruptions pose a serious hazard to aviation . Volcanic ash clouds consist of ash which is made of silt or sand sized pieces of rock, mineral, volcanic glass . Ash grains are jagged, abrasive, and don't dissolve in water. For example, during

1476-500: The island of Kyushu about 40 km (25 mi) east of Nagasaki . Beginning in June, a newly formed lava dome repeatedly collapsed. This generated a pyroclastic flow that flowed down the mountain's slopes at speeds as high as 200 km/h (120 mph). The 1991 eruption of Mount Unzen was one of the worst volcanic disasters in Japan's history, once killing more than 15,000 people in 1792. The eruption of Mount Vesuvius in 79 AD

1517-545: The mountainous terrain are cited as contributing factors to multiple aviation crashes in the area. There were seven aviation crashes around Mount Salak between 2002 and 2012. One person was killed in the crash of a small aircraft in October 2002, seven in October 2003, two in April 2004, and five in June 2004. Eighteen people were killed in the crash of an Indonesian Air Force military plane in 2008. In 2012, three people were killed in

1558-412: The size of Mount Pinatubo affected the weather for a few years; with warmer winters and cooler summers observed. A similar phenomenon occurred in the April 1815, the eruption of Mount Tambora on Sumbawa island in Indonesia . The Mount Tambora eruption is recognized as the most powerful eruption in recorded history. Its eruption cloud lowered global temperatures as much as 0.4 to 0.7 °C. In

1599-598: The woodpecker family). The juvenile is rather more grey. The rufous piculet is native to tropical southeastern Asia. Its range extends from southern Myanmar, through Thailand and the Malay Peninsula to the Greater Sunda Islands and Borneo . It is a resident and sedentary species, generally restricted to the lowlands and hills, but at altitudes of up to about 1,600 m (5,200 ft) in Borneo. Its typical habitat

1640-412: The world. The SO 2 in this cloud combined with water (both of volcanic and atmospheric origin) and formed sulfuric acid , blocking a portion of the sunlight from reaching the troposphere . This caused the global temperature to decrease by about 0.4 °C (0.72 °F) from 1992 to 1993. These aerosols caused the ozone layer to reach the lowest concentrations recorded at that time. An eruption

1681-468: The year following the eruption, most of the Northern Hemisphere experienced cooler temperatures during the summer. In the northern hemisphere , 1816 was known as the " Year Without a Summer ". The eruption caused crop failures, food shortages, and floods that killed over 100,000 people across Europe , Asia , and North America . Sasia abnormis The rufous piculet ( Sasia abnormis )

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