In the western margin of the Ulleung Basin, a detailed analysis of cores with geophysical data from a fan-shaped body, just downslope of a submarine gully associated upslope with failure scars, reveals various modes of mass-transport processes. The arcuate failure scars occurs in water depths exceeding 600 m. The fan-shaped body, less than ca. 10 km long in radius, displays strong backscatter intensity in sonar images, and corresponds to the uppermost transparent mass in Chirp sub-bottom profiles. Sediment cores penetrating to the uppermost transparent mass consist mostly of various facies of mass-transport deposits (MTDs), causing the strong back-intensity in the sonar images. The interval of MTD facies comprises the upper and lower units without hemi-pelagic muds between them, implying that the fan-shaped body was probably deposited during a single event separated in at least two stages without a significant time break. The lower unit shows brittle to plastic deformation of soft muds (slides/slumps), whereas the upper units exhibits fully fragmented soft mud clasts (low viscous debris flows). Both the upper and lower units involve same original lithology (i.e., soft hemi-pelagic mud) prior to failures, suggesting that the lithology could not significantly affect depositional processes. The fully fragmented soft mud clasts of the upper unit are probably indicative of more shearing than the brittle to plastic deformation of soft muds in the lower unit. Considering the small dimension of the failure scars/gully and the same original lithology, the more shearing of the upper unit was most likely caused by longer transport distance than that of the lower unit. The rare turbidites with absence of channellevee systems in the fan-shaped body and the failure scars confined in the upper to middle slopes suggest that the submarine gully probably formed by slope failures, not by erosion of turbidity currents.

在Ulleung盆地的西部边缘，利用扇形体的地球物理数据对岩心进行了详细的分析，而海底沟壑相关的上坡的下坡与破裂的伤痕恰好相结合，揭示了各种模式的物质传输过程。在超过600 m的水深中会出现弧形的故障疤痕。扇形体，小于约。半径10公里长，在声纳图像中显示强反向散射强度，并且对应于Chirp子底部剖面中最上面的透明质量。渗透到最上层透明块的沉积物芯大部分由各种质量的沉积物（MTD）相组成，从而在声纳图像中产生强烈的反向强度。MTD相的间隔包括上下单元，中间没有半浮游性泥浆，这意味着扇形体很可能是在至少两个阶段分开的单个事件中沉积的，没有明显的时间间隔。下部单元显示出软泥的脆性到塑性变形（滑动/塌陷），而上部单元显示出完全碎裂的软泥碎屑（低粘性泥石流）。上部和下部单元在破坏前都具有相同的原始岩性（即软性半浮游泥浆），这表明岩性不会显着影响沉积过程。与下部单元中软泥的脆性到塑性变形相比，上部单元中完全碎裂的软泥屑可能表明剪切力更大。考虑到故障疤痕/沟渠的尺寸较小，并且原始岩性相同，与下部单元相比，较长的运输距离最有可能导致上部单元的剪切力增加。扇形体中没有通道堤系统的稀有浊积体以及局限于上中斜坡的破裂疤痕表明，潜艇沟可能是由斜坡破裂形成的，而不是由浊流的侵蚀形成的。