Shear strength (handheld penetrometer) from IODP Hole 386-M0088B

Shear strength from handheld penetrometer 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 handheld (pocket) penetrometer equipped with a 10 mm diameter tip. The tip was pushed 6.3 mm perpendicular to the split core surface with the measuring pin downward until the groove marked on the tip was even with the level of the core surface. The resulting resistance (compressive strength) was read from the device and used to calculate undrained shear strength. At each measurement depth, three measurements were conducted and the resulting undrained shear strength averaged. In the case of major discrepancies between the three measurements, the team verified the results by repeating the measurements.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）指定钻孔的手持贯入仪剪切强度数据。本数据集采集于2022年11月15日至11月30日期间在"Chikyu"号钻探船（D/V Chikyu）上开展的386航次第三阶段——个人采样队（Personal Sampling Party, PSP）的岩芯处理流程末期。测量采用配备直径10mm探头的手持（袖珍）贯入仪，在岩芯劈分后的工作半块上进行：将测针朝下，垂直于劈开的岩芯表面将探头推进6.3mm，直至探头上的刻槽与岩芯表面齐平。读取设备显示的阻力（抗压强度）数据，以此计算不排水剪切强度。每个测量深度处均开展3次测量，并对所得不排水剪切强度取平均值；若3次测量结果存在显著偏差，团队将通过重复测量对结果进行复核。如需进一步了解方法细节，请参阅Strasser M.等人2023年发表的研究中的方法章节：https://doi.org/10.14379/iodp.proc.386.102.2023