Shear strength (shear vane) from IODP Hole 386-M0092B

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

本数据集涵盖国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震研究）前述钻孔的自动十字板剪切仪（automated shear vane, AVS）剪切强度数据。该数据集采集于386航次第三阶段——个人采样分队（Personal Sampling Party, PSP）的岩芯处理流程末期，该阶段于2022年11月15日至2022年11月30日在“地球号”（D/V Chikyu）钻探船上实施。研究人员使用Wykeham-Farrance AVS剪切仪，对岩芯分段的测试工作面半块进行剪切强度测量。该仪器由四块相互垂直的十字板构成，测试时将其完全插入沉积物内，以最大程度降低对沉积物的扰动。电机驱动螺旋扭转弹簧加载，弹簧下端与十字板相连。因此，弹簧下端的偏转量可记录沉积物的角位移，据此可计算得到不排水剪切强度（undrained shear strength）。本次测量在整个岩芯中大致每2米尝试开展一次，但部分岩性（尤其是上部数米的沉积物）过于松软，无法获取可靠的测试结果，因此在本数据集的「剪切强度 [kPa]」列中，对应深度的记录为空白值。如需进一步了解测试方法细节，请参阅Strasser M. 等人2023年发表的研究成果中的方法章节，链接：https://doi.org/10.14379/iodp.proc.386.102.2023