Shear wave splitting analysis to characterise lithospheric mantle anisotropy has been performed to provide better knowledge about lithospheric deformation and mantle flow beneath the Sunda–Banda arc transition, Indonesia. The tectonic setting of the study area is very complex characterised by the transition from subduction along Sunda arc to collision in Banda arc. The splitting measurements show lateral and vertical variation in the fast directions of the S-waves in this region. When the splitting results are analysed through 2D delay-time tomography and spatial averaging, systematic patterns in delay times and fast polarisation become more visible. In the subduction domain, the spatial averages of fast directions are dominated by two distinct fast polarisations: perpendicular and parallel to the plate motion for shallow and deep events, respectively. The results suggest that anisotropy in this area is not only controlled by anisotropic source related to the simple mantle flow model, but also by anisotropic fabric in the mantle deformed under influence of high stresses, high water contents and low temperatures. In addition, there might also be contribution from the anisotropic body in the upper layer. In the collision domain, spatially averaged fast directions show mostly perpendicular to the plate motion for all deep levels. For shallow level in this region, this trend is mainly governed by the lithospheric deformation process due to the continent-arc collision as also shown by delay time tomographic inversion. For deeper part of the region, the result of tomographic inversion and spatial averaging reveals a high anisotropy followed by rotational pattern of fast directions in the north of Timor. We suggest that this pattern might be related to the induced mantle flow due to lateral tearing of the slab.

进行了表征岩石圈地幔各向异性的剪切波分裂分析，以提供有关印度尼西亚the他-班达弧过渡下岩石圈变形和地幔流动的更好的知识。研究区的构造环境非常复杂，其特征是从沿着Sun他弧的俯冲到班达弧的碰撞的过渡。分裂测量显示出在该区域中S波的快速方向上的横向和垂直变化。通过2D延迟时间层析成像和空间平均分析分裂结果时，延迟时间和快速极化的系统模式变得更加明显。在俯冲域中，快速方向的空间平均值由两个不同的快速极化控制：垂直和平行于板块运动的浅层和深层事件，分别。结果表明，该区域的各向异性不仅受与简单地幔流模型有关的各向异性源的控制，而且还受到受高应力，高含水量和低温影响而变形的地幔中各向异性纤维的控制。另外，上层的各向异性体也可能有贡献。在碰撞域中，对于所有深层，空间平均的快速方向大部分显示为垂直于板块运动。对于该区域的浅水平面，这种趋势主要受大陆弧碰撞引起的岩石圈变形过程控制，这也由延迟时间层析成像反演表明。在该地区的深处，层析成像反演和空间平均的结果显示，各向异性高，随后在帝汶北部快速方向旋转。我们建议这种模式可能与由于板的横向撕裂引起的地幔流动有关。