Shear strength (shear vane) from IODP Hole 386-M0081B

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（日本海沟古地震学研究）指定钻孔的自动十字板剪切（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）的岩心处理流程末期，该阶段于2022年11月15日至2022年11月30日期间在“地球号”（D/V Chikyu）科考船上实施。测试在岩心半片工作样上开展，所用仪器为怀克汉姆-法伦斯（Wykeham-Farrance）型自动十字板剪切仪。该仪器包含四块相互垂直的十字板，测试时将十字板完全插入沉积物内，同时尽可能减小对沉积物的扰动。电机驱动螺旋扭转弹簧加载，弹簧底端与十字板相连，因此弹簧底端的偏转角可记录沉积物的角位移，据此可计算得到不排水抗剪强度。本次测试计划在整个岩心中每隔约2米开展一次，但部分岩性（尤其上部数米的沉积物）过于松软，无法获取可靠测试结果，这些岩心深度在本数据集的"抗剪强度 [kPa]"列中留空。如需进一步了解方法学细节，请参阅Strasser M.等人2023年发表的研究中的方法章节，链接：https://doi.org/10.14379/iodp.proc.386.102.2023