P-wave velocity of discrete samples (DPW) from IODP Hole 386-M0085B

P-wave velocity data from discrete samples from the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). During the onshore phase of expedition 386, which took place between 2022-02-14 – 2022-03-15 onboard D/V Chikyu, discrete samples for P-wave velocity measurements were taken from the work halves approx. every 2 meter down core using syringes with an inner diameter of 2 cm. Samples measured 2.5–3 cm long for a sample volume of ~10 cubic centimetres. Samples were then shipped to the European Petrophysics Consortium (EPC) laboratory at the University of Leicester (UK) for processing. Measurements were performed with a Geotek P-wave logger for discrete samples (PWL-D). Measurements were attempted for each sample, however, the unconsolidated lithology of some samples proved unsuitable for the instrument (e.g. too soupy or too friable to be placed between the transducers).Operator notes: Data from section numbers > 30 can be associated to a decrease in velocity values, this is likely due to cracks opening in the samples when applying pressure on it at the time of measurement (as observed by operators). For holes M0081E & F Sections 1-29 velocity values are overestimated due to an issue with the calibration.For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.2023

国际海洋发现计划（IODP）第386航次（日本海沟古地震学）上述钻孔的离散样品纵波速度数据。第386航次的陆上阶段于2022年2月14日至3月15日在地球号钻探船（D/V Chikyu）上开展，期间使用内径为2 cm的注射器，从岩心工作半段中每约2米采集一个用于纵波速度测量的离散样品。样品长度为2.5–3 cm，体积约为10立方厘米。随后，样品被运至英国莱斯特大学的欧洲岩石物理联合会（EPC）实验室进行处理。测量采用Geotek离散样品纵波记录仪（PWL-D）。尝试对每个样品进行测量，但部分样品的未固结岩性（如过于糊状或易碎，无法放置于换能器之间）不适合该仪器。操作员说明：编号大于30的岩心段数据显示纵波速度值下降，这可能是由于测量时施加压力导致样品产生裂隙（如操作员观察所示）。对于M0081E和F孔的1–29段，由于校准问题，纵波速度值被高估。更多方法学信息请参见Strasser等（2023）的方法章节，DOI：https://doi.org/10.14379/iodp.proc.386.102.2023