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Great Sumatran Fault
The Indonesian island of Sumatra is located in a highly seismic area of the world. In addition to the subduction, subduction zone off the west coast of the island, Sumatra also has a large Fault (geology)#Strike-slip faults, strike-slip fault, the Great Sumatran Fault also known as Semangko Fault, running the entire length of the island. This fault zone accommodates most of the strike-slip motion associated with the oblique convergence between the Indo-Australian Plate, Indo-Australian and Eurasian plate, Eurasian Plate tectonics, plates. The fault ends in the north just below the city of Banda Aceh, which was devastated in the 2004 Indian Ocean earthquake. After the December 2004 earthquake, pressure on the Great Sumatran Fault has increased tremendously, especially in the north. Geologic significance The Great Sumatran Fault is part of the system where strain partitioning was first described in plate tectonics. The convergence between the Indo-Australian Plate and the Sunda Plat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 Guinea. Indonesia is the world's largest archipelagic state and the 14th-largest country by area, at . With over 275 million people, Indonesia is the world's fourth-most populous country and the most populous Muslim-majority country. Java, the world's most populous island, is home to more than half of the country's population. Indonesia is a presidential republic with an elected legislature. It has 38 provinces, of which nine have special status. The country's capital, Jakarta, is the world's second-most populous urban area. Indonesia shares land borders with Papua New Guinea, East Timor, and the eastern part of Malaysia, as well as maritime borders with Singapore, Vietnam, Thailand, the Philippines, Australia, Palau, and India ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunda Arc
The Sunda Arc is a volcanic arc that produced the volcanoes that form the topographic spine of the islands of Sumatra, Nusa Tenggara, and 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. Formation and geologic setting Mid-oceanic ridge basalts (MORB) form most of the oceanic basin south of Sunda, according to geodynamic studies. These plates began to converge in the Early Miocene. The Indo-Australian Plate is subducting beneath the Eurasian Plate with the dip angle of 49-56 degrees. The slab subducting under Java is continuous down to the lower mantle. However, the slab appears to beak apart under Sumatra Island''.'' Earthquake depth records indicate that there is no deep seismic activity in Sumatra, likely due to the age of the subducting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Indonesia
This is a brief summary of the geology of Indonesia. Indonesia is located between two major tectonic plates, the Australian Plate and the Eurasian Plate. Tectonics The tectonics of Indonesia are very complex, as it is a meeting point of several tectonic plates. Indonesia is located between two continental plates: the Australian Plate (Sahul Shelf) and the Eurasian Plate (Sunda Shelf); and between two oceanic plates: the Pacific Plate and the Philippine Sea Plate. The subduction of the Indian Plate beneath the Eurasian Plate formed the volcanic arc in western Indonesia, one of the most seismically active areas on the planet with a long history of powerful eruptions and earthquakes. This chain of active volcanoes formed Sumatra, Java, Bali, and the Lesser Sunda Islands, most of which, particularly Java and Bali, emerged within the last 2–3 million years. The Pacific and Australian plate movements controlled the tectonics of the eastern portion of Indonesia. Structural g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Faults Of Southeast Asia
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. It also includes studies of earthquake environmental effects such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic, atmospheric, and artificial processes such as explosions. A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of Earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology. History Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus (c. 585 BCE), Anaximenes of Miletus (c. 550 BCE), Aristotle (c. 340 BCE), and Zhan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ring Of Fire
The Ring of Fire (also known as the Pacific Ring of Fire, the Rim of Fire, the Girdle of Fire or the Circum-Pacific belt) is a region around much of the rim of the Pacific Ocean where many Types of volcanic eruptions, volcanic eruptions and earthquakes occur. The Ring of Fire is a Horseshoe, horseshoe-shaped belt about long and up to about wide. The Ring of Fire includes the Pacific coasts of South America, North America and Kamchatka, and some islands in the western Pacific Ocean. Although there is consensus among geologists about almost all areas which are included in the Ring of Fire, they disagree about the inclusion or exclusion of a few areas, for example, the Antarctic Peninsula and western Indonesia. The Ring of Fire is a direct result of plate tectonics: specifically the movement, collision and destruction of lithosphere, lithospheric plates (e.g. the Pacific Plate) under and around the Pacific Ocean. The collisions have created a nearly continuous series of subdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1933 Sumatra Earthquake
The 1933 Sumatra earthquake or Liwa earthquake occurred in West Lampung Regency, Lampung Province, Indonesia on June 25. The earthquake had an estimated surface-wave magnitude () of 7.7 occurring at a shallow depth of 20 km. It had an epicenter onshore, devastating the city of Liwa. At least 76 people were reported killed, although the death toll may have been in the thousands. Aftershocks followed, including one which was strong enough to cause additional fatalities. The mainshock also triggered a nearby volcanic eruption two weeks later, killing some people. Tectonic setting The west coast of Sumatra is dominated by the Sunda megathrust; a 5,500 km long convergent boundary where the Australian Plate subducts beneath the Burma Plate and Sunda Plate at a rate of per year. Convergence along this plate boundary is highly oblique, severely deforming the overriding Sunda Plate, where it is accommodated by strike-slip motion along the Great Sumatran fault. The Great S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1994 Liwa Earthquake
The 1994 Liwa earthquake occurred on . It was located in southern Sumatra, Indonesia. The magnitude of the earthquake was put at 6.9, 7.0, or 7.2, according to different sources."The Sumatran Fault Zone – From Source to Hazard" by D. H. Natawidjaja and W. Triyoso The earthquake caused 207 deaths and 2000 injuries. There was damage from landslides, mudslides, and fires in Lampung Province. Power outage occurred in western Lampung. Six-thousand buildings were damaged or destroyed by landslides in the Liwa area. In addition to southern Sumatra, the earthquake could be felt in western Java and Singapore. Intense smoke and gas activity was observed in the Suwoh volcanic area. The earthquake took place at the Sumatran Fault Zone. The Sumatran Fault Zone is 1,900 km long and highly segmented. It can be divided into about 20 segments. The earthquake occurred in a subparallel strand 2.5 km southwest of the principal trace of the Kumering segment. The focal mechanism is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1995 Kerinci Earthquake
The 1995 Kerinci earthquake struck near Sungai Penuh in Jambi Province on the island of Sumatra, Indonesia. It earthquake occurred at 01:18 WIB (UTC +7) local time on October 7. The earthquake measured 6.7 on the moment magnitude scale, and 6.9–7.0 on the surface wave magnitude scale. Between 84 and possibly even 100 people were killed in the earthquake. An extimated 4,000 buildings collapsed or were seriously damaged while a further 5,000 suffered some damage. Earthquake The earthquake was associated with shallow strike-slip faulting along the Great Sumatran Fault, instead of thrust mechanism associated with the Sunda Megathrust to the west coast. It ruptured the Siulak segment of the fault which was also involved in a magnitude 7.3 earthquake in 1909. This segment of the fault had been quiet for an unusually long period prior to the 1995 earthquake. Impact The damage occurred mainly in the valley linear to the Great Sumatran Fault. Serious damage was reported north of L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1943 Alahan Panjang Earthquakes
The 1943 Alahan Panjang earthquakes occurred on June 8 and June 9 UTC (June 9, 1943, local time) in Sumatra, then under Japanese occupation. This was an earthquake doublet (the shocks occurred at the same location on consecutive days). The first mainshock occurred on June 8 at 20:42 UTC. It ruptured the Suliti segment of the Sumatran Fault Zone. The magnitude was given as 7.2, or 7.1. The second mainshock occurred on June 9 at 03:06 UTC. It ruptured the Sumani segment of the Sumatran Fault Zone and perhaps the northwestern part of the Suliti segment. The magnitude was given as 7.5, or 7.4. Alahan Panjang was damaged in the earthquakes. Right lateral offsets were reported near the town of Solok. Near the Sumani segment, earthquake doublets occurred repeatedly. Similar earthquake doublet nearby include the earthquakes in 1926 and 2007. See also *List of earthquakes in 1943 *List of earthquakes in Indonesia __NOTOC__ This is an incomplete list of more recent recorded ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1926 Padang Panjang Earthquakes
West Sumatra, Dutch East Indies (today Indonesia) was struck by an earthquake doublet on June 28, 1926. The first earthquake occurred at 10:23 local time, with an estimated magnitude of 6.7 on the surface wave magnitude scale with an intensity of IX (''Violent'') on the Modified Mercalli Intensity Scale. Less than three hours later, a second earthquake occurred with a magnitude of 6.4 although it appears to have been less damaging. Three hundred and fifty-four people were killed during the first earthquake, with later shocks killing a total of 57 according to local records. Tectonic setting The Great Sumatran fault 1900 km in length is a major strike-slip fault zone that cuts through the island of Sumatra. It accommodates the right-lateral strike-slip component of the highly oblique collision zone between the Indo-Australian Plate and the Sunda plate. The Sunda megathrust carries the dip-slip component of the collision with the upper portion of the over-riding plat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2022 Sumatra Earthquake
On 25 February 2022, a moment magnitude 6.2 earthquake struck West Sumatra, Indonesia at a depth of . Preceded by one foreshock and followed by over 200 aftershocks, the mainshock had an epicenter at the foot of Mount Talakmau in Pasaman Regency. The mainshock was the result of strike-slip faulting along a previously unidentified segment of the Great Sumatran Fault. At least 27 people died, 457 were injured, and 19,221 others were displaced. It inflicted Rp. 780 million worth of damages. The heaviest damage was recorded at three villages around Mount Talakmau. Landslides and flash floods caused additional damage and casualties. Tectonic setting The west coast of Sumatra is dominated by the Sunda megathrust; a long convergent boundary where the Australian Plate subducts beneath the Burma Plate and Sunda Plate at a rate of per year. The subduction zone offshore Sumatra was responsible for several large earthquakes in 2004 and 2005. The subduction plate interface can r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Singkarak
Lake Singkarak ( id, Danau Singkarak) is a lake in West Sumatra, Indonesia. It is located between the regencies of Tanah Datar and Solok Regency. It has an area of 107.8 km2, being approximately 21 km long and 7 km wide. The natural outlet for excess water is the Ombilin river which flows eastward to the Strait of Malacca. A hydroelectric project, however, has diverted most of the lake outflow to the Anai river which flows westward into the Indian Ocean near Padang. This Singkarak power station uses this water to generate power for the West Sumatra and Riau provinces. A species of fish called ''ikan bilih'' (''Mystacoleucus padangensis'') is endemic to the lake, and is harvested for human consumption. A railway line, which connects Padang and Sawahlunto-Sijunjung, skirts the length of the lake on the eastern side. See also * List of lakes of Indonesia Notes References * * * * * Singkarak Lake Singkarak ( id, Danau Singkarak) is a lake in West Sumatra, Ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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