活断層からみた南部フォッサマグナ地域のネオテクトニクス (南部フォッサマグナ・フィリピン海プレ-ト北縁のネオテクトニクス)
スポンサーリンク
概要
- 論文の詳細を見る
The South Fossa Magna in central Japan is thought to be a collisional zone between the Philippine Sea plate and the Asia plate. In this region, intense tectonic movements such as folding, faulting and other crustal movements have been proceeding since the early Quaternary. Several active faults which have an extremely high vertical slip rate are distributed along the north end of the Izu bar.Three tectonic sub-regions can be distinguished on the basis of the sense of fault movement and other tectonic features. That is, the area of the southwestern foot of Mt. Fuji, the area of the south end of the Tanzawa Mts. and the Ashigara-Oiso area. The first area is located in the northern extension of the Suruga trough. This area is divided into three blocks by N-S trending active faults. The easternmost block shows distinct subsidence and the others upheave with a high rate. In the second area, an E-W trending high angle reverse fault bounds the south end of the Tanzawa Mts. The topographic feature of this fault is indistinct. The third area is located in the northwestern extension of the Sagami trough. The NW trending Kozu-Matsuda fault which has a sence of reverse and right lateral slip divides the area into the Oiso hills and the Ashigara plain. The former shows a distinct upheaval which occurred in recent geological ages and the latter suggests the decrease of its subsidence rate.Studies of the crustal movements in each sub-region reveal the following common tectonic features. That is, each crustal block distant from the Izu bar has changed its movement style from the phase of intense subsidence to that of upheaval through the transitional phase. A newly created fault or a subsidence zone has always occurred in a block closer to the Izu bar. As a consequence, the latest tectonic zone in the South Fossa Magna seems to have migrated from a distant position closer to the Izu bar. Fig. 3 shows a concept of the tectonic process across the tectonic zone in the South Fossa Magna. This tectonic process is the process of accretion of the sediment to Honshu in the landward region of the Suruga and Sagami troughs. The active faults in this region are considered to be neither interplate faults nor branches from the main boundary fault but the imbricated thrust faults in the accretional sediments.
- 日本第四紀学会の論文
著者
関連論文
- 新富士火山初期の大きなソレアイトマグマだまりにおける結晶分化(火山のモデル(II))
- 愛媛県西条市における中央構造線岡村断層のトレンチ発掘調査
- 糸魚川 - 静岡構造線活断層系の最近の断層活動 - 牛伏寺断層・松本市並柳地区トレンチ発掘調査 -
- 64. 大分層群中の火砕流堆積物について(日本火山学会1986年度秋季大会)
- 64 大分層群中の火砕流堆積物について
- 南関東の地震テクトニクスと国府津・松田断層の活動
- 25年後, 地質学は未来を予測する科学になる
- 1896年陸羽地震の地震断層
- 活断層からみた南部フォッサマグナ地域のネオテクトニクス (南部フォッサマグナ・フィリピン海プレ-ト北縁のネオテクトニクス)
- 立川断層とその第四紀後期の運動
- 106. 福井県三方五湖の表層堆積物の層相と地殻変動との関係
- ボ-リング調査で明らかになった丹那盆地の変形構造
- 62A. 古富士および新富士火山噴出物の微量元素(日本火山学会1989年春季大会)
- 235 富山トラフの第四紀地殻変動 : 「しんかい2000」による潜航調査の成果
- 62A 古富士および新富士火山の噴出物の微量元素
- ボーリング調査で明らかになった丹那盆地の変形構造
- 活断層からみた南部フォッサマグナ地域のネオテクトニクス (南部フォッサマグナ・フィリピン海プレ-ト北縁のネオテクトニクス)
- 立川断層とその第四紀後期の運動
- 鎌倉市長谷小路周辺遺跡の液状化跡
- Trenching Study of Okamura Fault of the Median Tectonic Line Active Fault System at Saijo in August, 1988
- 1990 Trenching Study of the Gofukuji Fault of the Itoigawa-Shizuoka Tectonic Line Active Fault System at Namiyanagi, Matsumoto, Central Japan