Approximate surface projection on Pacific Ocean of the Vityaz Trench (blue). The approxiamate area of deep-focus earthquakes mentioned in the page text that may be associated with the old subduction at the trench is shaded light red.
It is named after the Russian research vessel Vityaz that discovered it in 1958.[1]
Geographyedit
It is north east of Vanuatu with a greatest depth of 6.1 km (3.8 mi) but can be as shallow as 3.5 km (2.2 mi).[3]
To its south east there are three discontinuous and elongated troughs called respectively the Alexa, Rotuma and Horne Troughs. They connect the Vityaz Trench via what is termed the Vitiaz Trench Lineament[4] to the northern end of the Tonga Trench.[2]
Tectonicsedit
It was formed during the middle Neogene (activity stopped about 8 million years ago), when its location was the then convergent plate boundary between the Pacific and Indo-Australian Plates.[2] At this time the Vitiaz Arc was a continuous east-facing volcanic arc extending from the region of Tonga to the region of the Solomon Islands. Now it is inactive (i.e. fossil) but has geological importance as it separates the northern Cretaceous crust of the Pacific Plate from the Cenozoic basalts of the North Fiji and Lau Basins.[2] To its south west is the East Melanesian Rise and onward, deep under the present North Fiji Basin is a zone of deep earthquakes believed to be associated with the slab of Pacific Crust subducted previously at the trench.[5]
^ abcdPelletier, B.; Auzende, JM (1996). "Geometry and structure of the Vitiaz Trench Lineament (SW Pacific)". Marine Geophysical Researches. 18 (2–4): 305–335. Bibcode:1996MarGR..18..305P. doi:10.1007/BF00286083. S2CID 53641446.
^Lemenkova, Polina (2020). "GMT based comparative geomorphological analysis of the Vityaz and Vanuatu Trenches, Fiji Basin". Geodetski List. 74 (1): 19–39. doi:10.6084/m9.figshare.12249773.
^Brocher, TM (1985). "On the formation of the Vitiaz Trench lineament and North Fiji Basin". Retrieved 2023-06-24.
^Okal, EA; Kirby, SH (1998). "Deep earthquakes beneath the Fiji Basin, SW Pacific: Earth's most intense deep seismicity in stagnant slabs" (PDF). Physics of the Earth and Planetary Interiors. 109 (1–2): 25–63. Bibcode:1998PEPI..109...25O. doi:10.1016/S0031-9201(98)00116-2.
April 13, 2024
vityaz, trench, also, known, vitiaz, east, melanesian, trench, oceanic, trench, tectonic, feature, south, west, pacific, ocean, floor, approximate, surface, projection, pacific, ocean, blue, approxiamate, area, deep, focus, earthquakes, mentioned, page, text, . The Vityaz Trench also known as the Vitiaz or East Melanesian Trench 1 is an oceanic trench tectonic feature of the South West Pacific Ocean floor 2 Approximate surface projection on Pacific Ocean of the Vityaz Trench blue The approxiamate area of deep focus earthquakes mentioned in the page text that may be associated with the old subduction at the trench is shaded light red Contents 1 History 2 Geography 2 1 Tectonics 3 References 3 1 NotesHistory editIt is named after the Russian research vessel Vityaz that discovered it in 1958 1 Geography editIt is north east of Vanuatu with a greatest depth of 6 1 km 3 8 mi but can be as shallow as 3 5 km 2 2 mi 3 To its south east there are three discontinuous and elongated troughs called respectively the Alexa Rotuma and Horne Troughs They connect the Vityaz Trench via what is termed the Vitiaz Trench Lineament 4 to the northern end of the Tonga Trench 2 Tectonics edit It was formed during the middle Neogene activity stopped about 8 million years ago when its location was the then convergent plate boundary between the Pacific and Indo Australian Plates 2 At this time the Vitiaz Arc was a continuous east facing volcanic arc extending from the region of Tonga to the region of the Solomon Islands Now it is inactive i e fossil but has geological importance as it separates the northern Cretaceous crust of the Pacific Plate from the Cenozoic basalts of the North Fiji and Lau Basins 2 To its south west is the East Melanesian Rise and onward deep under the present North Fiji Basin is a zone of deep earthquakes believed to be associated with the slab of Pacific Crust subducted previously at the trench 5 References editNotes edit a b IHO IOC GEBCO Gazetteer of Undersea Feature Names Vitiaz Trench Retrieved 2023 06 24 a b c d Pelletier B Auzende JM 1996 Geometry and structure of the Vitiaz Trench Lineament SW Pacific Marine Geophysical Researches 18 2 4 305 335 Bibcode 1996MarGR 18 305P doi 10 1007 BF00286083 S2CID 53641446 Lemenkova Polina 2020 GMT based comparative geomorphological analysis of the Vityaz and Vanuatu Trenches Fiji Basin Geodetski List 74 1 19 39 doi 10 6084 m9 figshare 12249773 Brocher TM 1985 On the formation of the Vitiaz Trench lineament and North Fiji Basin Retrieved 2023 06 24 Okal EA Kirby SH 1998 Deep earthquakes beneath the Fiji Basin SW Pacific Earth s most intense deep seismicity in stagnant slabs PDF Physics of the Earth and Planetary Interiors 109 1 2 25 63 Bibcode 1998PEPI 109 25O doi 10 1016 S0031 9201 98 00116 2 Retrieved from https en wikipedia org w index php title Vityaz Trench amp oldid 1203465383, wikipedia, wiki, book, books, library,
