A Model of Plate Bending at the Transition Zone From Subduction to Collision in Northernmost Manila Trench

• 出版年: Geophysical Research Letters
• 主要な著者: Jiangyang Zhang, Zhen Sun, Hongfeng Yang, Fan Zhang
• フォーマット: 論文
• 言語: 英語
• 出版事項: Wiley 2022-09-01
• 主題: subduction zone; collision zone; plate bending; numerical simulation; stress; Manila trench
• オンライン･アクセス: https://doi.org/10.1029/2022GL100474
• ISSN: 0094-8276; 1944-8007

Abstract It is not rare to observe subduction zones transferring into collision zones. However, it is poorly understood the lateral variation in flexural deformation. Constrained by newly published seismic reflection data, we investigate the mechanical behavior of lithosphere from oceanic subduction to collision at the northern Manila trench using the 3‐D flexural modeling. Results show that both plate rigidity and the loadings increase from the Manila subduction zone to the Taiwan orogenic belt. In order to fit all observations, an upward loading was required at the transition zone from subduction to collision, which may be related to the variation of buoyancy due to density contrast of plate from south to north. The resultant maximum bending stress is consistent with the concentrated seismic activity at the southwest of Taiwan, suggesting that huge loading from the orogeny and lateral density change of subducting plate play important roles in bending and seismicity.