P-wave velocity of discrete samples (DPW) from IODP Hole 386-M0091A

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

国际大洋发现计划（IODP）第386航次（日本海沟古地震学）中上述钻孔离散样品的P波速度（P-wave velocity）数据。第386航次的陆上阶段于2022年2月14日至2022年3月15日在地球号钻探船（D/V Chikyu）上进行，期间采用内径2厘米的注射器，从岩心工作半段每约2米采集一份离散样品，用于P波速度测量。样品长度为2.5至3厘米，体积约10立方厘米。样品随后被运送至英国莱斯特大学的欧洲岩石物理联盟（EPC）实验室进行处理。使用Geotek离散样品P波记录仪（PWL-D）开展测量。尝试对每个样品进行测量，但部分样品的未固结岩性（unconsolidated lithology）不适用于该仪器（例如，过于稀软或松散，无法放置在换能器（transducers）之间）。操作人员备注：段号大于30的数据可能与速度值降低相关，这可能是由于测量时施加压力导致样品出现裂缝（如操作人员所观察到的）。对于M0081E和F孔的1-29段，由于校准问题，速度值被高估。更多方法学细节请参见Strasser等（2023）的方法学章节，DOI：https://doi.org/10.14379/iodp.proc.386.102.2023。