Shear strength (shear vane) from IODP Hole 386-M0091C

Shear strength from automated shear vane (AVS) of the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). This dataset was obtained at the end of the core processing workflow during the third phase (Personal Sampling Party, PSP) of expedition 386, which took place between 2022-11-15 – 2022-11-30 onboard D/V Chikyu. Measurements were performed on the work halves of core sections using a Wykeham-Farrance AVS. The apparatus consists of four vanes perpendicular to each other that are inserted in the sediment to their full length while attempting to minimize disturbance to the sediment. A motor loads a helical torsion spring and the bottom of the spring is united to the vane. Therefore, the bottom deflection of the spring records the angular displacement of the sediment, from which undrained shear strength has been calculated. Measurements were attempted approx. every 2 m throughout the core, though, some lithologies, especially in the upper few meters were too soft to obtain reasonable results. These core depths are blank in the Shear strength [kPa] column of the presented dataset.For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.2023

本数据集为国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震研究）目标钻孔的自动十字板剪切仪（automated shear vane, AVS）测试所得抗剪强度数据。该数据集采集于386航次第三阶段（个人采样队，Personal Sampling Party, PSP）的岩芯处理流程收尾阶段，该阶段于2022年11月15日至2022年11月30日在“地球号”（D/V Chikyu）钻探船上开展。测试采用Wykeham-Farrance品牌自动十字板剪切仪对岩芯测试半块进行测定。该设备由四片相互垂直的十字板组成，测试时将十字板完全插入沉积物中，力求将对沉积物的扰动降至最低。设备通过电机驱动加载螺旋扭转弹簧，弹簧下端与十字板固定连接。因此，弹簧下端的挠度可记录沉积物的角位移，据此可计算得到不排水抗剪强度。测试大致沿岩芯每2米开展一次，但部分岩性（尤其是上部数米的沉积物）过于松软，无法获得可靠测试结果，此类岩芯深度在本数据集的"抗剪强度 [kPa]"列中以空白值标注。如需进一步了解测试方法细节，请参阅Strasser M.等人2023年发表的《国际大洋发现计划航次报告386》方法章节，DOI：10.14379/iodp.proc.386.102.2023。