The interactions between arc-continent collision and subduction zones are still poorly understood. Here, we use 2D seismic data to document upper plate deformational features and identify different structural styles along the New Guinea Trench, western Pacific, and discuss their broader significance. In the western section, normal faults and negative flower structures occur within the strata of the upper plate. An unconformity represents the signal of tectonically driven subsidence. In the eastern section, both thick-skinned and thin-skinned thrusting are found within the frontal upper plate. In the central section, rare extensional or shortening deformation is identified within the forearc basement and overlying strata. Horizontal, thick sedimentary sequences within the Caroline subbasin have been subducted beneath the upper plate. This suggests that Miocene subduction in the eastern section led to the formation of a thrust-deformed ophiolitic basement in the upper plate. Since the Miocene, strike-slip tectonic processes dominated in the upper plate, causing compressional deformation in the strata in the eastern section and extensional to transtensional deformation in the strata in the western section. The strike-slip tectonic processes might have been weakened in the upper plate in central section due to the incoming Eauripik Rise. Over geologic time, arc-continent collision processes and related changing of regional tectonic forces can have a long-lived influence on shaping and deforming subduction systems.

弧陆碰撞和俯冲带之间的相互作用仍然知之甚少。在这里，我们使用二维地震数据来记录上板块的变形特征，并确定西太平洋新几内亚海沟沿线的不同结构样式，并讨论其更广泛的意义。在西段，上板地层内发育正断层和负花状构造。不整合面代表构造驱动下沉的信号。在东段，在锋上板块内发现厚皮和薄皮逆冲。在中部，在弧前基底和上覆地层内发现了罕见的伸展或缩短变形。卡罗琳次盆地内的水平厚沉积层序已经俯冲到上板块之下。这表明东段中新世俯冲导致上板块形成逆冲变形蛇绿质基底。中新世以来，上板块以走滑构造为主，造成东段地层发生挤压变形，西段地层发生拉张变形。由于传入的欧里皮克隆起，中部上板块的走滑构造过程可能已经减弱。随着地质时间的推移，弧陆碰撞过程和区域构造力的相关变化可以对俯冲系统的形成和变形产生长期影响。上板块以走滑构造为主，造成东段地层发生挤压变形，西段地层发生拉张变形。由于传入的欧里皮克隆起，中部上板块的走滑构造过程可能已经减弱。随着地质时间的推移，弧陆碰撞过程和区域构造力的相关变化可以对俯冲系统的形成和变形产生长期影响。上板块以走滑构造为主，造成东段地层发生挤压变形，西段地层发生拉张变形。由于传入的欧里皮克隆起，中部上板块的走滑构造过程可能已经减弱。随着地质时间的推移，弧陆碰撞过程和区域构造力的相关变化可以对俯冲系统的形成和变形产生长期影响。