贝阿塔海岭北部地壳与上地幔建模（CARIBE NORTE 项目）
Modeling the crust and upper mantle in northern Beata Ridge (CARIBE NORTE Project)
AI总结：
本文利用 CARIBE NORTE 广角地震数据对贝阿塔海岭北部地壳和上地幔进行建模，揭示以贝阿塔岛为界的东西两侧构造差异及上地幔深度变化。
摘要：
加勒比海东北部构造复杂，伊斯帕尼奥拉岛和波多黎各位于该区域，其北部边界为斜向汇聚的俯冲带，南部边界为与穆埃尔托斯海槽相关的初始俯冲带。加勒比海中部盆地的显著特征是存在一个突出的地形构造——贝阿塔海岭，其洋壳厚度异常。贝阿塔海岭北部沿一条北东向横向排列与伊斯帕尼奥拉岛中部发生碰撞，该排列构成一个形态构造界限，从而导致锡瓦奥谷地中断，并使河流和盆地向相反方向分流。该排列方向与一条不连续面一致，这一不连续面可以解释该岛东西两侧地震活动的极端差异。已有不同研究提供了关于贝阿塔海岭的信息，主要是基于多道地震（MCS）数据的浅部结构信息。本研究利用 CARIBE NORTE（2009）广角地震数据，沿贝阿塔海岭北翼一条 WNW-ESE 走向测线进行分析，提供了关于浅部、中部和深部结构的完整构造认识。结果显示，以贝阿塔岛为界，东西两侧存在明显的构造差异。在海地盆地区域，沉积盖层受海底地形强烈影响，其厚度向岛屿方向减薄。在该区域，上地幔深度达 20 km，在沉积盖层消失的岛屿下方加深至 24 km。
英文摘要：
The complex tectonic region of NE Caribbean, where Hispaniola and Puerto Rico are located, is bordered by subduction zone with oblique convergence in the north and by incipient subduction zone associated to Muertos Trough in the south. Central Caribbean basin is characterized by the presence of a prominent topographic structure known as Beata Ridge, whose oceanic crustal thickness is unusual. The northern part of Beata Ridge is colliding with the central part of Hispaniola along a transverse NE alignment, which constitutes a morphostructural limit, thus producing the interruption of the Cibao Valley and the divergence of the rivers and basins in opposite directions. The direction of this alignment coincides with the discontinuity that could explain the extreme difference between west and east seismicity of the island. Different studies have provided information about Beata Ridge, mainly about the shallow structure from MCS data. In this work, CARIBE NORTE (2009) wide-angle seismic data are analyzed along a WNW-ESE trending line in the northern flank of Beata Ridge, providing a complete tectonic view about shallow, middle and deep structures. The results show clear tectonic differences between west and east separated by Beata Island. In the Haiti Basin area, sedimentary cover is strongly influenced by the bathymetry and its thickness decreases toward to the island. In this area, the Upper Mantle reaches 20 km deep increasing up to 24 km below the island where the sedimentary cover disappears.
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