Trench marginal rise - Trench marginal rise

Japanese: 海溝周縁隆起帯 - かいこうしゅうえんりゅうきたい
Trench marginal rise - Trench marginal rise

...This depression is thought to be a fault formation caused by tension due to the bending of the seafloor. The uppermost part of the ocean side of the trench is called the marginal swell, which is 500 to 1,000 meters shallower than the outer seafloor, and is also thought to be a bulge caused by the bending of the seafloor. This formation is 200 to 500 km wide and has a very gentle slope. ...

From [Submarine Topography]

...When an oceanic plate sinks, the sedimentary layers that have accumulated on top cannot sink, but are scraped off at the base of the landward slope of the trench and added to the land mass on the landward side, forming slopes with complex topography in some places. Also, on the ocean side of the trench, a marginal swell, which is a bulge corresponding to the bending of the plate, is formed. On the landward side of the trench, there is an island arc containing a volcanic chain, as can be seen in many trenches in the Western Pacific Ocean.

*Some of the terminology used to refer to "trench marginal rise zone" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このくぼみは海底の屈曲がもたらす張力によって生じた断層地形だと思われる。海溝の海側を上りつめたところは,さらに外側の海底よりも500~1000m浅く海溝周縁隆起帯(マージナル・スウェルmarginal swell)とよばれているが,これも海底の屈曲に伴うふくれ上がりだとされている。この地形は幅200~500kmにわたる,ごくゆるい傾斜のものである。…

【海底地形】より

…海洋プレートが沈み込むとき上に積もっている堆積層は沈み込むことができず,海溝陸側斜面の基部でかきとられて陸側の地塊に付加され,複雑な地形の斜面を形成する所もある。また海溝の海側にはプレートの曲りに対応した膨らみである海溝周縁隆起帯(マージナル・スウェルmarginal swell)の地形が生じる。海溝の陸側には西太平洋の多くの海溝に見られるように火山列を含む島弧が存在する。…

※「海溝周縁隆起帯」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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