The region around the Celebes Sea, SE Asia, is evolving within a convergent tectonic environment involving the Pacific plate to the east and the Indian-Australian plate to the south. It is arguably one of the most tectonically complex regions in the world and serves as an ideal setting to study dynamic interactions between the Pacific and Tethys tectonic domains. The issue of which subducting plate plays a leading role in governing the regional mantle flow is not well understood. Mantle flow can be characterized by seismic anisotropy observations, providing clues for understanding regional tectonics. We conducted SKS-wave splitting analysis by using data from seven seismic stations located around the Celebes Sea. Our results, when combined with previous observations, suggest the presence of various types of mantle flow in this area, including (a) corner flow in the mantle wedge above the westward-subducting Molucca Sea (Sangihe) slab, (b) two-layer anisotropy related to the eastward-subducting Molucca Sea (Halmahera) slab, (c) deflected flow due to proximity to the Sangihe slab's edges, (d) trench-normal mantle flow beneath southeastern Borneo due to the subduction of the Indian-Australian plate, and (e) Northwest Borneo-Palawan trough-parallel mantle flow beneath northeastern Borneo. Various types of mantle flow indicate that the dynamic interactions of adjacent subduction zones played crucial roles in influencing the regional upper mantle dynamics between the Tethys and western Pacific domains since the breakup of the Gondwana supercontinent in the Mesozoic.

中文翻译：

---

东南亚太平洋和特提斯域之间多个俯冲系统交汇点下方的地幔流型：SKS-波分裂测量的约束

东南亚西里伯斯海周围地区正在汇聚构造环境中演化，包括东面的太平洋板块和南面的印度-澳大利亚板块。它可以说是世界上构造最复杂的地区之一，是研究太平洋和特提斯构造域之间动态相互作用的理想场所。哪个俯冲板块在控制区域地幔流中起主导作用的问题尚不清楚。地幔流可以通过地震各向异性观测来表征，为理解区域构造提供线索。我们进行了SKS- 使用位于西里伯斯海周围的七个地震台站的数据进行波分裂分析。我们的结果与先前的观察结果相结合，表明该地区存在各种类型的地幔流，包括（a）向西俯冲的摩鹿加海（Sangihe）板块上方的地幔楔中的角流，（b）两层与向东俯冲的摩鹿加海 (Halmahera) 板块有关的各向异性，(c) 由于靠近 Sangihe 板块边缘而偏转的流动，(d) 由于印度-澳大利亚板块的俯冲，婆罗洲东南部下方的沟渠正常地幔流动， (e) 婆罗洲东北部下方的西北婆罗洲-巴拉望槽平行地幔流。