Shear strength (shear vane) from IODP Hole 386-M0081F

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. […]

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航次）指定钻孔的自动十字板剪切仪（automated shear vane, AVS）实测剪切强度数据。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日在“地球号”（D/V Chikyu）钻探船上开展。测量采用Wykeham-Farrance型自动十字板剪切仪，在岩心段的工作半芯上进行。该仪器由四块相互垂直的十字板组成，将十字板完全插入沉积物中以尽可能降低对沉积物的扰动。电机驱动加载螺旋扭转弹簧，弹簧下端与十字板相连。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剪切强度。本次研究尝试在整个岩心中约每2米开展一次测量，但部分岩性（尤其是上部数米的沉积物）过软，无法获得可靠测量结果。此类岩心深度在本数据集的“剪切强度 [kPa]”列中以空白值标记。[…]