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The back-arc region is the area behind a volcanic arc. In island volcanic arcs, it consists of back-arc basins of oceanic crust with abyssal depths, which
Back-arc_region
Submarine features associated with island arcs and subduction zones
A back-arc basin is a type of geologic basin, found at some convergent plate boundaries. Presently all back-arc basins are submarine features associated
Back-arc_basin
Region between an oceanic trench and associated volcanic arc
the volcanic arcs that are characteristic of convergent plate margins. A back-arc region is the companion region behind the volcanic arc. Many forearcs
Forearc
System of faults in Indonesia
The thrust faults are south-dipping and lie within the back arc region of the Sunda–Banda Arc, which is related to the ongoing subduction of the Australian
Flores_back-arc_thrust_fault
Topics referred to by the same term
Greece Back-arc basin, a subsided region caused by back-arc extension Back-arc region, the region created by back-arc extension, containing all the basins
Arc
Volcanic arc in Alaska, United States
North American plate also caused a back-arc region of tectonic deformation that spans 700 km from the Aleutian Arc into the interior of Alaska to form
Aleutian_Arc
Oceanic trench along the southeastern edge of Japan's Ryukyu Islands in the Pacific Ocean
back arc region parallel to the trench, a transect spanning the trench, fore arc and back arc region, and a transect spanning the Ryukyu volcanic arc
Ryukyu_Trench
Volcanic island arc in Indonesia
K2O/Na2O ratio in comparison to other parts of Sunda Arc. The most salient volcanoes in the back-arc region are Lasem, Muria, and Bawean in which their volcanic
Sunda_Arc
Miocene caldera in southwestern Bolivia, in the Andes
geothermal system to the west. Guacha is part of a volcanic complex in the back-arc region of the Andes in Bolivia. The Central Andes are underlaid by the
Cerro_Guacha
Mountain in Bolivia and Argentina
drive the activity in the volcanic arc. East of the main volcanic arc of the Central Volcanic Zone the back-arc region has been volcanically active since
Vilama_(caldera)
Chain of volcanic islands in the South Aegean Sea
plate compressing the region behind the arc. The extension deformed the region into its current configuration. First, the arc moved to the south and
South_Aegean_Volcanic_Arc
First historically recorded tsunami
African plate. North–south extension within the Aegean Sea plate in the back-arc region compensates the subduction rate. Shallow crustal earthquakes within
479_BC_Potidaea_earthquake
Volcano in Argentina
sediments and Miocene volcanic rocks. Volcanoes there are part of the back-arc region of the Andean Central Volcanic Zone, where volcanism is caused by the
Chimpa
Geological process at tectonic plate boundaries
into the mantle. A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The
Subduction
Greek island in the Aegean Sea
South Aegean Volcanic Arc. The volcanic arc is approximately 500 km (300 mi) long and 20 to 40 km (12 to 25 mi) wide. The region first became volcanically
Santorini
Convergent boundary in Micronesia
The Izu–Bonin–Mariana (IBM) arc system is a tectonic plate convergent boundary in Micronesia. The IBM arc system extends over 2800 km south from Tokyo
Izu–Bonin–Mariana_arc
Earthquake in Japan
Ikeda Y. & Umino N. (2004). "Late Cenozoic tectonic development of the back arc region of central northern Honshu, Japan, revealed by recent deep seismic
1993_Okushiri_earthquake
Destructive tectonic event in Indonesia
along a fault located in the back-arc region between the Sunda and Banda island arcs. The Flores Thrust represents a back-arc thrust fault that accommodated
1992 Flores earthquake and tsunami
1992_Flores_earthquake_and_tsunami
First period of the Mesozoic Era
of Pangea, resulted in subduction rollback and extension across the back-arc region. This generated large amounts of felsic magmatism. These extensional
Triassic
June 1964 earthquake in Japan
southeastern margin of the Sea of Japan, an area of oceanic crust created by back-arc spreading from the late Oligocene to middle Miocene. The extensional tectonics
1964_Niigata_earthquake
Non-profit foundation
doubled the number of known hydrothermal vent sites in the Mariana Back-arc region and discovered a recently erupted underwater lava field. In 2016, an
Schmidt_Ocean_Institute
1983 earthquake and tsunami centered off the coast of Akita Prefecture, Japan
Ikeda Y. & Umino N. (2004). "Late Cenozoic tectonic development of the back arc region of central northern Honshu, Japan, revealed by recent deep seismic
1983_Sea_of_Japan_earthquake
Small tectonic plate in the eastern Mediterranean Sea
other. The Aegean Sea area is thought to be an actively extending back-arc region due to slab rollback on the Hellenic subduction zone. This has resulted
Aegean_Sea_plate
Volcano in Argentina
Department, south of the Mendoza Province in Argentina. It lies in the back-arc region of the Andean Volcanic Belt, and was formed by the subduction of the
Payún_Matrú
Volcano in Bolivia
Volcanism in the Andes occurs in a frontal volcanic arc, but also in the back-arc region. This back-arc volcanism that Tunupa is part of has an uncertain
Tunupa
Subduction zone under the western Pacific Ocean
subduction initiation, where a new subduction zone is created in a back-arc region with the opposite direction of subduction to that previously operating
New_Britain_subduction_zone
Volcanic field in Bolivia
covers an area of about 300,000 square kilometres (120,000 sq mi); the back-arc region alone where Morococala lies emplaced more than 10,000 cubic kilometres
Morococala
7.0 magnitude earthquake and tsunami affecting Turkey and Greece
African plate. North–south extension within the Aegean Sea plate in the back-arc region compensate the subduction rate. Shallow crustal earthquakes within
2020_Aegean_Sea_earthquake
Earthquake in Latin America
earthquake has been suggested to have ruptured the same area of the back-arc region. Three distinct "shocks" were reported in Matina; deep fissures appeared
1822_Costa_Rica_earthquake
Oceanic basin in the South Pacific Ocean between Fiji and Tonga
The Lau Basin is a back-arc basin (also addressed as "interarc basin") at the Australian-Pacific plate boundary. It is formed by the Pacific plate subducting
Lau_Basin
Earthquake in Japan
Ikeda Y. & Umino N. (2004). "Late Cenozoic tectonic development of the back arc region of central northern Honshu, Japan, revealed by recent deep seismic
2019_Yamagata_earthquake
Stratovolcano in Argentina
is a prominent volcano of the back arc of the Andes and lies about 280 kilometres (170 mi) east of the main volcanic arc. Part of the Central Volcanic
Cerro_Tuzgle
Submarine volcano in Tonga
volcanic eruption ever found until 2015 when a segment of the Mariana Back-Arc erupted, producing lava flows and plumes. West Mata can be found in the
West_Mata
Arc-shaped volcanic archipelago
Lesser Antilles is an example). The fore-arc basin forms between the fore-arc ridge and the island arc; it is a region of undisturbed flat-bedded sedimentation
Island_arc
Structural basin that develops adjacent and parallel to a mountain belt
belt – The Southern Chaco Foreland Basin in northern Argentina Back-arc basin Back-arc region Forearc basin Passive margin Allen et al. 2004 Allen & Allen
Foreland_basin
Geological feature in Australia
The back arc region was extended at this time. Between 447 to 443 million years ago in the Ordovician to Silurian, the arc collided with the back arc, ending
Lachlan_Fold_Belt
1815 natural disaster in Indonesia
people. Off the north coast of Bali is the Flores back-arc thrust fault, located in the back-arc region. It formed due to the convergence between the Sunda
1815_Bali_earthquake
Meteorological phenomenon
inside on the back of the droplet and refracted again when leaving it. In a double rainbow, a second arc is seen about 10° outside the primary arc. Its colours
Rainbow
Salt pan in Antofagasta de la Sierra, Argentina
den (July 2008). "40Ar/39Ar geochronology of mafic volcanism in the back-arc region of the southern Puna plateau, Argentina". Journal of South American
Salar_del_Hombre_Muerto
occur in the back-arc region. However, if the velocity of slab rollback and trench retreat exceeds that of the overriding plate, then back-arc extension
Tyrrhenian_Basin
Season of television series
his Straw Hat Pirates. The season adapts material from the "Elbaph" story arc, from the 111th volume onwards of the manga series One Piece by Eiichiro
One_Piece_season_22
(1 July 2008). "40Ar/39Ar geochronology of mafic volcanism in the back-arc region of the southern Puna plateau, Argentina". Journal of South American
Tebenquicho
Fourth season of Demon Slayer: Kimetsu no Yaiba
manga's "Hashira Training" arc was announced. The fourth season, titled Demon Slayer: Kimetsu no Yaiba – Hashira Training Arc, adapts from the 15th and
Demon Slayer: Kimetsu no Yaiba season 4
Demon_Slayer:_Kimetsu_no_Yaiba_season_4
Volcanic field in Argentina
the region, probably in response to the delamination of the crust beneath the region: large scale ignimbrites erupted at Galán and small back-arc volcanoes
Antofagasta_de_la_Sierra
1980 studio album by Steve Winwood
Arc of a Diver is the second and breakout solo studio album by the English singer/multi-instrumentalist Steve Winwood. Released in 1980, Winwood played
Arc_of_a_Diver
River in Phocis and Aetolia-Acarnania, Greece
latter is still subducting and compressing. This extension in the back-arc region, causing normal faults, even while reverse faults are still collecting
Mornos
2003 video game
Arc the Lad: Twilight of the Spirits ("アークザラッド 精霊の黄昏" Āku za Raddo: Seirei no Tasogare, also known as Arc: Twilight of the Spirits in Europe) is a 2003
Arc the Lad: Twilight of the Spirits
Arc_the_Lad:_Twilight_of_the_Spirits
Rift system in North Island, New Zealand
Initially between 10 and 5 million years ago the rift developed in a back arc region to the now extinct Coromandel volcanoes. It has a basement of mesozoic
Hauraki_Rift
Mountainous region in eastern North America
region encompasses. The most commonly used modern definition of Appalachia is the one initially defined by the Appalachian Regional Commission (ARC)
Appalachia
Smartphone by Sony Ericsson
March 2011 Availability by Region: UK (April 2011) Predecessor: Sony Ericsson Xperia X10 Successor: Sony Ericsson Xperia Arc S Form Factor: Slate Dimensions:
Sony_Ericsson_Xperia_Arc
Island arc system in the Southern Ocean
ancestral arc, which formed a separate subduction system, broke through this land bridge and started to form the Scotia Sea by eastward back-arc extension
Scotia_Arc
Historical volcanic area in Alaska, United States
associated lava flows. Volcanologically, the field is situated in a back-arc region. Volcanic rocks from the field have basaltic compositions. Devil Mountain
Espenberg_volcanic_field
Mountain in Argentina
den (July 2008). "40Ar/39Ar geochronology of mafic volcanism in the back-arc region of the southern Puna plateau, Argentina". Journal of South American
Antofalla
1982 studio album by Steve Winwood
Talking Back to the Night is the third solo studio album by English recording artist Steve Winwood. Released less than two years after the top 3 hit Arc of
Talking_Back_to_the_Night
Island group in the Malay Archipelago
name "Sunda." The use of the term "Sunda" to refer to the Indonesian region dates back to the claims of Claudius Ptolemaeus in 150 AD. In the 16th century
Sunda_Islands
Tectonic belt of earthquakes and volcanoes
interactions at these plate boundaries have formed oceanic trenches, volcanic arcs, back-arc basins and volcanic belts. The inclusion of some areas in the Ring of
Ring_of_Fire
Earthquake in Japan
southeastern margin of the Sea of Japan, an area of oceanic crust created by back-arc spreading from the late Oligocene to middle Miocene. The extensional tectonics
2004_Chūetsu_earthquake
Volcanic field in Argentina
basement composition beneath the eastern Sierras Pampeanas (Argentine back-arc region) from seismological and gravity data". Tectonophysics. 740–741: 42–52
Pocho_volcanic_field
Long narrow depression bordering the Aegean Sea to the south
view postulating that the HT may be the result wholly or partially of back-arc extension and slab rollback. The "partial" view hypothesizes that the western
Hellenic_Trench
Active back-arc basin in the western Pacific Ocean
an active back-arc basin in the western Pacific Ocean (Stern, Fouch & Klemperer 2003). It is an integral part of the Izu–Bonin–Mariana Arc system. The
Mariana_Trough
3rd season of Pokémon Horizons and the 28th season overall
The second arc, "Episode: Mega Evolution", covering the next three episodes, shows how Roy and Ult met in the Kalos region. The third arc, "Rising Again"
Pokémon Horizons – Rising Hope
Pokémon_Horizons_–_Rising_Hope
Volcano in La Pampa, Argentina
located 530 kilometres (330 mi) east of the Peru–Chile Trench, in the back-arc region. Agua Poca has erupted basalt lava. Bisceglia (1977) assumed that Agua
Agua_Poca
Geologic region of Iberia and north Africa
The Gibraltar Arc is a geological region corresponding to an arcuate orogen surrounding the Alboran Sea, between the Iberian Peninsula and Africa. It consists
Gibraltar_Arc
Plate boundary between the Amurian and Okhotsk plates in East Asia
shortening has been ongoing in the eastern margin and back-arc region of the Northeastern Japan Arc since 3.5 million years ago. This deformation is attributed
Eastern margin of the Sea of Japan
Eastern_margin_of_the_Sea_of_Japan
Stratovolcano in Bolivia and Chile
Finally, small alkaline volcanic centres are found primarily in the back-arc region and appear to be young. A notable trait of the Central Andes are the
Ollagüe
1987 compilation album by Steve Winwood
previous album, Back in the High Life. One track, "Valerie", was originally released as a single for Winwood's 1982 album, Talking Back to the Night. Despite
Chronicles (Steve Winwood album)
Chronicles_(Steve_Winwood_album)
Seamount chain east of Australia that includes Lord Howe Island
Seamount Province of the Mariana Arc, in the Izu–Bonin–Mariana Arc. Its location is consistent with it being a back-arc extension associated volcano. Samples
Ruby_Seamount
Second season of Demon Slayer: Kimetsu no Yaiba
Demon Slayer: Kimetsu no Yaiba – Mugen Train Arc, is a seven-episode recompilation of the "Mugen Train" arc as featured in the 2020 anime film. It contains
Demon Slayer: Kimetsu no Yaiba season 2
Demon_Slayer:_Kimetsu_no_Yaiba_season_2
Volcanic chain located in the Bicol region
The Bicol Volcanic Arc (also called the Bicol Volcanic Chain) is a 260-kilometer-long volcanic arc located in the central-eastern margin of the Philippine
Bicol_Volcanic_Arc
2nd season of Pokémon Horizons and the 27th season overall
Academy in the Paldea region to learn about the Terastal phenomenon and battle Gym Leaders under Tera Training. The second arc, "Rayquaza Rising", covering
Pokémon Horizons – The Search for Laqua
Pokémon_Horizons_–_The_Search_for_Laqua
Amazonian region of Ecuador
The Oriente (Spanish: Región amazónica) is a region of eastern Ecuador, comprising the eastern slopes of the Ecuadorian Andes and the lowland areas of
Oriente_(Ecuador)
Convergent plate boundary that stretches from the North Island of New Zealand northward
number of microplates exist between the two major plates and host various back-arc structures of which the largest are the volcanic Tonga–Kermadec Ridge,
Tonga–Kermadec subduction zone
Tonga–Kermadec_subduction_zone
Fourth season of anime television series
entitled the "Loss Arc", ran from April 8 to June 17, 2026, for a total of 11 episodes. The second cours, entitled the "Recapture Arc", is set to premiere
Re:Zero_season_4
Plate boundary zone between the African plate and the Anatolian plate
attributed to rollback of the Ionian subduction and consequent back-arc extension in the Aegean region. Rather than a single, narrow fault line, deformation spreads
Cyprus_Arc
Gas discharge lamp that produces intense white light
A xenon arc lamp is a highly specialized type of gas discharge lamp, an electric light that produces light by passing electricity through ionized xenon
Xenon_arc_lamp
Region of active deformation between colliding tectonic plates
volcanism in the surrounding volcanic arcs has been called the andesite line. Back-arc basins form behind a volcanic arc and are associated with extensional
Convergent_boundary
Area bounded by a circular arc and a straight line
disk as a chord. More formally, a circular segment is a plane region bounded by a circular arc (of less than π radians by convention) and the circular chord
Circular_segment
Interior Plateau located in the Central Interior of British Columbia. The region includes the Cariboo Plateau and Chilcotin Plateau, and the adjoining Marble
Fraser_Plateau
High-end smartphone by Sony Ericsson
The Sony Ericsson Xperia Arc S (Xperia LT18i) is a high-end smartphone developed by Sony Ericsson running Google's operating system (OS) Android 2.3.4
Sony_Ericsson_Xperia_Arc_S
Canceled commuter-rail project
Access to the Region's Core (ARC) was a proposed commuter-rail project to increase passenger service capacity on New Jersey Transit (NJT) between Secaucus
Access_to_the_Region's_Core
Type of gas-discharge light source that emits ultraviolet light
spectroscopy when a continuous spectrum in the ultraviolet region is needed. Plasma "arc" or discharge lamps using hydrogen are notable for their high
Deuterium_arc_lamp
Second season of Jujutsu Kaisen
manga's "Hidden Inventory / Premature Death" and "Shibuya Incident" story arcs. "Hidden Inventory / Premature Death" acts as a prequel to Jujutsu Kaisen
Jujutsu_Kaisen_season_2
American science fiction franchise
Back to the Future is an American science fiction media franchise created by Robert Zemeckis and Bob Gale. The franchise follows high school student Marty
Back to the Future (franchise)
Back_to_the_Future_(franchise)
Japanese anime television series
February 2024. The film trilogy adapting the manga's "Infinity Castle" story arc premiered in July 2025. The series received critical acclaim for its storyline
Demon Slayer: Kimetsu no Yaiba (TV series)
Demon_Slayer:_Kimetsu_no_Yaiba_(TV_series)
Active submarine volcano in the Northern Mariana Islands
of the Mariana Trough, which is a back-arc basin. Since the 1800s, 6 of the 9 volcanic islands in the Mariana Arc have had recorded activity. Other than
Ahyi_Seamount
Oceanic rift valley in the south-west Pacific Ocean to the north of New Zealand
Colville Ridge The Havre Trough (Havre Basin) is a currently actively rifting back-arc basin about 100 km (62 mi) to 120 km (75 mi) wide, between the Australian
Havre_Trough
Volcanic belt in South America
broad volcanic arc. The area with volcanic activity 1 to 2 million years ago between 39°S-42°S was up to 300 km (190 mi) wide (if back-arc volcanism is
Andean_Volcanic_Belt
Season of television series
2012, and the last one was released on December 3, 2013. The main story arc, called "Fish-Man Island" (魚人島, Gyojin-tō), adapts material from the 61st
One_Piece_season_15
1st season of Pokémon Horizons and 26th season of the Pokémon animated series
exploring the Pokémon world, including the Paldea region introduced in Pokémon Scarlet and Violet. The second arc, "The Sparkling of Terapagos", covering the
Pokémon_Horizons:_The_Series
Region of the Fraser Plateau in British Columbia, Canada
Mountains. Volcanism of the Chilcotin Plateau is considered to be related to back-arc basin crustal extension behind the coastal Cascadia subduction zone. Tsilhqot'in
Chilcotin_Plateau
Oceanic basin in the south-west Pacific Ocean between Fiji and Vanuatu
spreading back-arc basin delimited by the Fiji islands to the east, the inactive Vitiaz Trench to the north, the Vanuatu/New Hebrides island arc to the west
North_Fiji_Basin
Sedimentary Basin in Caribbean Sea
The Grenada Basin is an 11–15 km thick back-arc sedimentary basin located in the southeastern region of the Caribbean Sea. It is bordered by the Lesser
Grenada_Basin
Japanese manga series by Eiichiro Oda
animation (ONA) series remake for Netflix, starting from the East Blue story arc, to commemorate the 25th anniversary of the original anime series. The new
One_Piece
Third season of anime television series
cours, entitled the "Attack Arc", ran from October 2 to November 20, 2024. The second cours, entitled the "Counterattack Arc", ran from February 5 to March
Re:Zero_season_3
Double oceanic ridge in the south-west Pacific Ocean
part starts a curve that transitions to the eastern part, is of E-MORB back-arc basin-type composition and has an age of 49 ± 10 Ma. This western part
D'Entrecasteaux_Ridge
Mountain range in Morogoro Region of Tanzania
Morogoro Region, specifically in the Kilosa District. The mountains are named for the Kaguru people. The Ukaguru Mountains are part of the Eastern Arc Mountains
Ukaguru_Mountains
Mountain-building period that affected most of New England
volcanic arc. Instead, these rocks have geochemical and other characteristics typical of back-arc basins, which form behind the volcanic arc on the overriding
Taconic_orogeny
Measure for hazard from asteroid or comet impacts on Earth
uncertainty region of about ±90 million km, which placed the impact scenario just outside of the 3-sigma range. With a 6.6-day observation arc the asteroid
List of near-Earth potentially hazardous objects
List_of_near-Earth_potentially_hazardous_objects
Island region in North Atlantic and Caribbean
well as island arc deposits and oceanic crust from the Cretaceous (145–66 Ma). The Greater Antilles originated near the isthmian region of present-day
West_Indies
Notional arc 50 miles NW-NE of London
Oxford–Cambridge Arc or Oxford–Cambridge Growth Corridor (formerly the Cambridge – Milton Keynes – Oxford corridor) is a notional arc of agricultural and
Oxford–Cambridge_Arc
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