Soft-sediment deformation structure crops out in the Upper Triassic carbonate succession of Messaoudi Formation in the north eastern of Tataouine basin (south eastern Tunisia). The deformed interval is about 10 m thick and tack place between shallow-water limestone and stromatolitic bed. Soft-sediment deformation structures (slump), supareted by undeformed beds include boudins, pinch-and-swell structure, and normal faults and folded structures. Observations and measurements of the deformed structure and bed thickness of hinges and limbs indicate that all the deformed structures are related to slump structure, which affects unconsolidated sediment in the local paleo-slope. The internal mechanisms are ruled out due to the absence of features (high sediment rate, traction feature, chemical process). The slump was triggered by external mechanisms; tectonic effects related to the reactivation of EW faults during the opening movements of the paleotethys. These tectonic events generat a moderat seismic activity wich affected unconsolidated sediment.

上三叠统软沉积变形构造出露Tataouine盆地东北部（突尼斯东南部）Messaoudi组碳酸盐岩层序。变形层厚约 10 m，在浅水灰岩与叠层石层之间有粘性。软沉积物变形构造（塌落），被未变形层所支持，包括布丁构造、夹胀构造、正断层和褶皱构造。对铰链和支腿的变形结构和床层厚度的观测和测量表明，所有变形结构都与坍落结构有关，影响了当地古斜坡的松散沉积物。由于缺乏特征（高沉积率、牵引特征、化学过程），内部机制被排除在外。暴跌是由外部机制引发的；与古特提斯开放运动期间 EW 断层重新激活有关的构造效应。这些构造事件产生了影响松散沉积物的中等地震活动。