TaylorBrodsky_JGR2019_MineralSandShearFlows.mat

Results published in Taylor & Brodsky, JGR-Solid Earth, 2019. Each matlab structure represents one mineral tested, identified by the variable title.

Each structure contains the same fields, outlined below: rho: grain density measured in lab (kg/m^3) d50: median grain diameter of sample (m) dmax: maximum grain diameter of sample (m) mgr: median grain mass, calculated from rho and d50 (kg) Ngrains: circumference of sample cylinder divided by median grain diameter rheomALL: full data set from experiment including conditioning runs. Each entry represents one step in the experiment, with length sending on step type. columns are the same for each step and are outlined below: col1: Step time (s) col2: Axial force (N) col3: Sample height (µm) (relative within each experiment) col4: Angular Rotor Velocity (rad/s) col5: Torque (µN m) col6: Total time (s) col7: Angular displacement (rad) **The following data entries were not calibrated in the instrument for all experiments and should be ignored or calculated separately from columns 1-7** col8: Normal stress (Pa) col9: Shear rate (1/s) col10: Shear stress (Pa) col11: Temperature (degrees C) col12: Viscosity (Pa s) AE: 10Hz acoustic energy for last 30 seconds of each steady state velocity step evaluated rheom: a subset of rheomALL, showing data from 60 s steady state experiment steps only- these were evaluated for paper rawgap: sample height (uncalibrated) (µm) I: inertial number - calculated from rho, d50, Axial Force, Angular Rotor Velocity and a 5 grain diameter deep shear zone AEmean: 1 Hz running average of acoustic energy in the final 15 seconds of each 60 s steady state velocity step AEerr: L1 norm of 1 Hz running average of acoustic energy in the final 15 seconds of each 60 s steady state velocity step gapmeanRAW: average of (uncalibrated) sample height in the final 15 seconds of each 60 s steady state velocity step gapstd: standard deviation of sample height measurements in the final 15 seconds of each 60 s steady state velocity step Imean: average inertial number in the final 15 seconds of each 60 s steady state velocity step Istd: standard deviation of inertial number for the last 15 seconds of each 60 s steady state velocity step AEMassNorm: average acoustic energy (AEmean) divided by median grain mass (mgr) to give V^2 per grain for final 15 s of each 60 s steady state velocity step AEMassNormErr: L1 norm of acoustic energy divided by median grain mass for final 15 s of each 60 s steady state velocity step