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Shear-wave splitting measurements for a 10-year catalogue in Taupō volcano

<p>The dataset provided includes&nbsp;seismic anisotropy results using a&nbsp;10-year catalogue&nbsp;around Taupō volcano (January 2010 &nbsp;to December&nbsp;2019).&nbsp;For the seismic anisotropy measurements, we used seismic data from 23 stations managed by GeoNet.&nbsp;The earthquake catalogue for this dataset was determined by Illsley-Kemp et al. (2021) using matched-filtered earthquake detection (Chamberlain &amp; Townend,&nbsp;2018).&nbsp;The earthquake templates for the matched-filtered detection were obtained from the GeoNet catalogue with revised manual picks.&nbsp;</p> <p>In case you use this data, please cite the following publications:</p> <p>Bakkar, H. (2022).&nbsp;<em>Seismic anisotropy and time-frequency analyses during Taupō&#39;s 2019 unrest</em>&nbsp;[Master&#39;s thesis, Victoria University of Wellington].</p> <p>Illsley-Kemp, F., Barker, S. J., Wilson, C. J. N., Chamberlain, C. J., Hreinsd ́ottir, S., Ellis, S., Hamling, I. J., Savage, M. K., Mestel, E. R., &amp; Wadsworth, F. B. (2021). Volcanic unrest at Taupo ̄ volcano in 2019: Causes, mechanisms and implications.&nbsp;Geochemistry, Geophysics, Geosystems, e2021GC009803.</p> <p>The data is presented in&nbsp;.csv files, in the same format as MFAST output,&nbsp; (http://mfast-package.geo.vuw.ac.nz),&nbsp;in which each column is:</p> <p>1.&nbsp;Name of the event.</p> <p>2. Station code.</p> <p>3. Station latitude.</p> <p>4. Station longitude.</p> <p>5. Event identification number.</p> <p>6. Year.</p> <p>7. Julian day on which the event occurred, with decimal digits giving the fraction of the day.</p> <p>8. Earthquake latitude in degrees.</p> <p>9. Earthquake longitude in degrees.</p> <p>10. Distance between earthquake and station (km).</p> <p>11. Earthquake depth (km).</p> <p>12. Earthquake magnitude.</p> <p>13. Back azimuth&nbsp;in degrees.</p> <p>14. Initial polarisation of the shear wave in degrees.</p> <p>15. Error of the initial polarisation in degrees, one standard deviation.</p> <p>16. Start time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0.</p> <p>17.&nbsp;End time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0.</p> <p>18. Not used</p> <p>19. Not used</p> <p>20. Signal to noise ratio for this event.</p> <p>21. Delay tome between fast and slow shear wave in seconds.</p> <p>22.&nbsp;Delay time&nbsp;between fast and slow shear wave in seconds.</p> <p>23.&nbsp;Angle of the orientation of the fast shear wave (&phi;), in degrees from North.</p> <p>24. Error of&nbsp;&phi;&nbsp;in degrees, one standard deviation.</p> <p>25. Angle of incidence at the station, measured against a horizontal plane in degrees, where&nbsp;0&nbsp;means vertical incidence.</p> <p>26. Not used</p> <p>27.&nbsp;Type of measurement. This field contains the measurement code that is used, the number of measurement window start times&nbsp;and the number of window end times.</p> <p>28. Not used</p> <p>29. Not used</p> <p>30.&nbsp;Nyquist frequency of the event in Hz.</p> <p>31. Evaluation of the measurement quality.</p> <p>32.&nbsp;Lower corner frequency of the bandpass filter in Hz.</p> <p>33.&nbsp;Higher corner frequency of the bandpass&nbsp;filter in Hz.</p> <p>34.&nbsp;Angle between the initial&nbsp;polarisation and the fast orientation in degrees.</p> <p>35. Not used</p> <p>36. Not used</p> <p>37.&nbsp;The maximum value of the eigenvalue of the corrected covariance matrix.</p> <p>38.&nbsp;The number of degrees of freedom in the measurement.&nbsp; &nbsp; &nbsp;&nbsp;</p> <p>39.&nbsp;The minimum value of the eigenvalue of the covariance matrix before it was scaled to have the 95% confidence level set to 1.</p> <p>40.&nbsp;The&nbsp;S-wave travel time between the earthquake and the station.</p> <p>41.&nbsp;The dominant frequency in the S wave, determined from the frequency at the maximum spectral amplitude.</p>