Core logger data from vibracores collected offshore Oceanside to San Diego, southern California, during field activity 2018-638-FA from 2018-05-22 to 2018-05-26

41 cores were collected on cruise 2018-638-FA with a Rossfelder P-5 vibracorer.

42 core logger data files were created for 41 vibracores (core OC36 is in two sections). The core logging was done with a Geotek Multi-Sensor Core Logger running Geoteck MSCL software. The logger was equipped for gamma ray density measurements and P-wave sediment velocity measurements. The logging was performed at 1-cm intervals from the top of each core section. Core logger data consist of whole core P-wave relative amplitude, P-wave velocity, and gamma density. The GeoTek MSCL is equipped with two acoustic rolling transducers for measuring p-wave velocity on whole cores. The sensors were calibrated prior to logging with known dimensions of the core, core liner thickness, and core temperature. A 137Cs gamma ray source and gamma detector are mounted on the GeoTek MSCL for measuring bulk densities, which are based on gamma attenuation through core samples. The measurement was calibrated using an aluminum calibration piece mounted inside a water-filled polycarbonate core section. Anomalous values for P-wave velocity and gamma density were not excluded from the data. Measurements of velocity below 200 meters per second and gamma ray density measurements below 0.1 grams per cubic centimeter or missing data values were the result of poor contact with the core sample or air voids at the logging location.