Shear strength (handheld penetrometer) from IODP Hole 386-M0089A@en

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. […]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）上文提及钻孔的手持贯入仪剪切强度数据。本数据集采集于该航次第三阶段（个人采样分队，Personal Sampling Party, PSP）岩芯处理流程的收尾阶段，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。测量采用配备直径10 mm探头的手持（袖珍）贯入仪，在岩芯段的工作半块上进行：将带有测量针的探头垂直于劈开的岩芯表面下压6.3 mm，直至探头上标记的凹槽与岩芯表面齐平。读取仪器显示的阻力值（即抗压强度），并以此计算不排水剪切强度。每个测量深度均开展三次测量，对所得不排水剪切强度取平均值。若三次测量结果存在显著偏差，研究团队将通过重复测量对结果进行验证。[…]