The Avignonet landslide in the Trièves area is made of Quaternary paraglacial sediments among which imbricated till, glacio-lacutrine and fluviatil layers. Numerous boreholes (drillings and corings) were conducted during the mid-1980s and the mid-2000s to assess the geological and geotechnical setting of the inhabited, southern part of this slow-moving earthslide. Heterogeneous paramaters available from these different boreholes make interpretation difficult. Gamma-ray logging along with magnetic susceptibility and pocket vane tests on core samples allowed to distinguish between the different lithological and geotechnical units. Mechanical strength obtained from drilling parameter recording acquired during drilling was correlated to corings and their combination, along with outcrop observations, was used to delineate the lithological units and shear surfaces.

The joint analysis of the dataset with outcrop observations and chronological data reveals a high geological complexity with the intrication of various sedimentary units. Two ancient landslides, several tens of metres in width, were furthermore identified within the large Avignonet landslide, almost 2 km in width. All the results point toward a high lithological and hydrogeological complexity that impacts the dynamics of the landslide. This work shows the interest of a multi-proxy approach in studies involving Quaternary sedimentary units. The methodology developed here could be applied to other sites with different palaeoenvironmental contexts initially exhibiting sedimentary compaction, such as lacustrine or coastal environments.

特里夫斯地区的Avignonet滑坡是由第四纪的冰川期沉积物构成的，其中沉积有耕种层，冰川湖层和流浪汉层。在1980年代中期和2000年代中期，进行了许多钻孔（钻孔和取芯），以评估这种缓慢移动的滑坡的南部居民的地质和岩土环境。可从这些不同的井眼获得的异质参数使解释变得困难。伽马射线测井以及对磁芯样品的磁化率和口袋叶片测试允许区分不同的岩性和岩土单位。从钻井过程中获得的钻井参数记录获得的机械强度与取芯及其组合以及露头观测相关，

结合露头观测资料和年代学资料对数据集进行联合分析，发现随着各种沉积单元的复杂化，地质复杂性很高。此外，在宽约2 km的大型Avignonet滑坡中还发现了两个数十米宽的古老滑坡。所有结果都表明，岩性和水文地质复杂性很高，会影响滑坡的动力学。这项工作显示了在涉及第四纪沉积单元的研究中采用多代理方法的兴趣。这里开发的方法可以应用于最初显示出沉积压实作用的具有不同古环境背景的其他地点，例如湖相或沿海环境。