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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Influence of increasing convergence obliquity and shallow slab geometry onto tectonic deformation and seismogenic behavior along the Northern Lesser Antilles zone
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Influence of increasing convergence obliquity and shallow slab geometry onto tectonic deformation and seismogenic behavior along the Northern Lesser Antilles zone

机译：随着厚度和浅板几何对北方北方地区构造变形及地震发生的影响

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摘要

In subduction zones, the 3D geometry of the plate interface is one of the key parameters that controls margin tectonic deformation, interplate coupling and seismogenic behavior. The North American plate subducts beneath the convex Northern Lesser Antilles margin. This convergent plate boundary, with a northward increasing convergence obliquity, turns into a sinistral strike-slip limit at the northwestern end of the system. This geodynamic context suggests a complex slab geometry, which has never been imaged before. Moreover, the seismic activity and particularly the number of events with thrust focal mechanism compatible with subduction earthquakes, increases northward from the Barbuda-Anguilla segment to the Anguilla-Virgin Islands segment. One of the major questions in this area is thus to analyze the influence of the increasing convergence obliquity and the slab geometry onto tectonic deformation and seismogenic behavior of the subduction zone. Based on wide-angle and multichannel reflection seismic data acquired during the Antithesis cruises (2013-2016), we decipher the deep structure of this subduction zone. Velocity models derived from wide-angle data acquired across the Anegada Passage are consistent with the presence of a crust of oceanic affinity thickened by hotspot magmatism and probably affected by the Upper Cretaceous-Eocene arc magmatism forming the 'Great Arc of the Caribbean'. The slab is shallower beneath the Anguilla-Virgin Islands margin segment than beneath the Anguilla-Barbuda segment which is likely to be directly related to the convex geometry of the upper plate. This shallower slab is located under the forearc where earthquakes and partitioning deformations increase locally. Thus, the shallowing slab might result in local greater interplate coupling and basal friction favoring seismic activity and tectonic partitioning beneath the Virgin Islands platform. (C) 2018 Elsevier B.V. All rights reserved.
机译：在俯冲区域中，板接口的3D几何形状是控制边缘构造变形，INTE112耦合和发震性能的关键参数之一。北方北方较小的安妥尔斯利润率下方的北美板电平。这种收敛板边界，具有向北增加的收敛倾斜度，变成了系统的西北末端的Sinistral Strike滑动限制。该地磁语言上下文表明复杂的板坯几何形状，其从未在之前过成像。此外，地震活动和尤其是与俯冲地震兼容的推力焦距机制的事件数量从巴布达 - 安圭拉群落到安圭拉 - 维尔京群岛部分向北增加。一个在这方面的主要问题是这样分析的日益趋同倾角和平板几何上构造变形和俯冲带的孕震行为的影响。基于在对抗巡航期间获得的广角和多通道反射地震数据（2013-2016），我们破译了该俯冲区域的深层结构。源自Anegada通道中获取的广角数据的速度模型与热点岩浆岩层增厚的海洋亲和力的存在符合，并且可能受到形成“加勒比海的大弧”的上白垩纪 - eocene弧岩浆的影响。在安圭拉 - 维尔京群岛下方的平板较浅，比在安圭拉 - 巴布达段下方，这可能与上板的凸起几何形状直接相关。这种浅薄的板坯位于前臂下方，地震和分区变形在本地增加。因此，浅薄的板坯可能导致局部更大的Interplate耦合和基础摩擦，并且有利于维尔京群岛平台下面的地震活动和构造分配。 （c）2018年elestvier b.v.保留所有权利。

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