Deformation patterns caused by the subduction of a single seamount or aseismic ridge have been well studied in analogue and numerical models. However, the effects of sequential multi-seamount subduction on accretionary wedge deformation have rarely been investigated in details. We performed a series of analogue modelling experiments of sequential subduction involving two seamounts of variable shape, spacing and rheological properties of strata to better understand the deformation mechanisms of an accretionary wedge with multi-seamount subduction. The results demonstrate that a seamount significantly hinders the seaward propagation of the accretionary wedge and facilitates lateral propagation. Two structural quiet zones form at the leading and trailing edges of the subducted seamount in the early stage of collision. As the seamount deeply penetrates into the wedge, the structural quiet zone in the leading edge is remoulded by a duplex structure, which may help the upward transport of deep subducted sediments back into the shallow area. Comparatively, the structural quiet zone in the trailing edge remains undeformed because it is situated in the stress shadow of the seamount. Deformation of the strata between two subducting seamounts may occur by thrusts laterally propagating into the seamount gap, which is facilitated by the décollement layer. The modelling results provide insights into the complex deformation mechanisms related to seamounts collision observed in the accretionary wedge offshore from the Costa Rica margin.

在模拟和数值模型中已经对由单个海山或地震山脊俯冲引起的变形模式进行了很好的研究。但是，很少详细研究连续多次海山俯冲对增生楔形变形的影响。我们进行了一系列连续俯冲的模拟模拟实验，涉及两个形状，间距和流变特性可变的海山，以更好地了解多海山俯冲的增生楔形物的变形机制。结果表明，海山严重阻碍了增生楔的向海传播，并促进了横向传播。在碰撞的早期，两个结构安静带在俯冲海山的前缘和后缘形成。随着海山深深地渗透到楔块中，前缘的结构性静区被双重结构重塑，这可能有助于深层俯冲沉积物向上输送回到浅层区域。相对而言，后缘的结构性静区保持未变形，因为它位于海山的应力阴影中。两个俯冲海山之间地层的变形可能会通过横向传播到海山缝隙中的推力而发生，这由脱层层促进了。建模结果为深入了解与哥斯达黎加边缘海上增生楔中海山碰撞有关的复杂变形机制提供了见识。这可能有助于深层俯冲沉积物向上输送回到浅水区。相对而言，后缘的结构性静区保持未变形，因为它位于海山的应力阴影中。两个俯冲海山之间地层的变形可能会通过横向传播到海山缝隙中的推力而发生，这由脱层层促进了。建模结果为深入了解与哥斯达黎加边缘海上增生楔中海山碰撞有关的复杂变形机制提供了见识。这可能有助于深层俯冲沉积物向上输送回到浅水区。相对而言，后缘的结构性静区保持未变形，因为它位于海山的应力阴影中。两个俯冲海山之间地层的变形可能会通过横向传播到海山缝隙中的推力而发生，这由脱层层促进了。建模结果为深入了解与哥斯达黎加边缘海上增生楔中海山碰撞有关的复杂变形机制提供了见识。两个俯冲海山之间地层的变形可能会通过横向传播到海山缝隙中的推力而发生，这由脱层层促进了。建模结果为深入了解与哥斯达黎加边缘海上增生楔中海山碰撞有关的复杂变形机制提供了见识。两个俯冲海山之间地层的变形可能会通过横向传播到海山缝隙中的推力而发生，这由脱层层促进了。建模结果为深入了解与哥斯达黎加边缘海上增生楔中海山碰撞有关的复杂变形机制提供了见识。