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正如对贝尼奥夫带的滑动矢星所作的研究证明的,印度-澳大利亚和东南亚板块的会聚运动大致沿N-S向发生。因此,沿苏门答腊的俯冲是斜向的,在爪哇西南的俯冲是正交向的(图1)。苏门答腊之下的斜向俯冲导致会聚运动配分,沿主苏门答腊断层和明打威走滑断层具有走滑分量。根据地震证据,尤其是与俯冲有关的地震深度分布,有人提出在苏门答腊以南和巽他海峡之下俯冲板块内有不连续。曾认为两种俯冲体制的转变发生于爪哇西南面。问题是,苏门答腊断层和明打威断层是否延续到增生柱以及它们与西爪哇构造的关系如何?
As evidenced by studies of the sliding arrowheads of the Benioff belt, the convergence movement of the Indo-Australian and Southeast Asian plates generally takes place in the N-S direction. Therefore, the subduction along Sumatra is oblique and the subduction in southwestern Java is orthogonal (Figure 1). Oblique subduction beneath Sumatra resulted in a converging movement distribution with strike-slip components along the main Sumatra fault and the Mingweiwei strike-slip fault. According to the evidence of the earthquake, especially the subduction-related seismic depth distribution, it is proposed that there is discontinuity in the subducting slab south of Sumatra and the Strait of Altay. The transition of the two subduction regimes was thought to have occurred in the southwestern Java. The question is whether the Sumatran faults and the Mendowei faults extend to the accretionary columns and how they relate to the West Java structure?