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4 results for “shear-wave splitting”
Table S1 for "Lowermost mantle anisotropy beneath Africa from differential SKS-SKKS shear-wave splitting"
<p>SKS-SKKS measurements per station and per event. We provide details in the following order: station, network, station latitude, station longitude, event date, event time, event latitude, event longitude, event depth, event magnitude, distance, backazimuth, misalignment correction value, phi, dt, min. phi error, max. phi error, min. dt error, max. dt error, splitting intensity, min. splitting intensity error, max. splitting intensity error, category (SplitRacer), individual category, category for pair. Values for field ‘category(SplitRacer)’ are based on SplitRacer’s quality criteria: good, average, null-measurement, with our addition of the category ‘fair null-measurement’ for nulls which are slightly noisy. In general, these categories are selected by the user on the basis of the noise level of the traces, the amount of energy reduction, splitting intensity value (and errors), visual comparison of the time derivative radial component to the transverse component, scatter in the histogram over the used time windows and the size of 95% confidence level The selection of final usable events was then based on the width of the 95% confidence level. The field ‘Individual category’ has the following values: 0=null-measurement; 1=very good (phi error < 30°; dt error 0.75 s); 2= good (phi error >30°; < 60°, dt error > 0.75 s; <1.55 s), 3= fair (error bars larger than category 2 but clear splitting and the other phase of the same event is a category 1). Categories for pairs are: 0 = both phases are null-measurements; 1= both phases have an individual category of 1, individual categories of 1 & 2, or one phase is null while the other is an individual category 1; 2= both phases have an individual category of 2 or one phase is null while the other is an individual category 2 measurement or one phase is an individual category 1 measurement while the other is an individual category 3 measurement (the latter only applies to 30 pairs in total).</p>
Additional dataset concerning "Observations of mantle seismic anisotropy using array techniques: shear-wave splitting of beamformed SmKS phases"
<p>SplitRacer input and output for beams and single-station splitting measurements for event 201007290731. This dataset was used in "Observations of mantle seismic anisotropy using array techniques: shear-wave splitting of beamformed SmKS phases" by Jonathan Wolf, Daniel A. Frost, Maureen D. Long, Ed Garnero, Adeolu O. Aderoju, Neala Creasy and Ebru Bozdag. The manuscript is available at <a href="https://doi.org/10.1029/2022JB025556">https://doi.org/10.1029/2022JB025556</a>.</p>
Shear-wave splitting measurements for a 10-year catalogue in Taupō volcano
<p>The dataset provided includes seismic anisotropy results using a 10-year catalogue around Taupō volcano (January 2010 to December 2019). For the seismic anisotropy measurements, we used seismic data from 23 stations managed by GeoNet. The earthquake catalogue for this dataset was determined by Illsley-Kemp et al. (2021) using matched-filtered earthquake detection (Chamberlain & Townend, 2018). The earthquake templates for the matched-filtered detection were obtained from the GeoNet catalogue with revised manual picks. </p> <p>In case you use this data, please cite the following publications:</p> <p>Bakkar, H. (2022). <em>Seismic anisotropy and time-frequency analyses during Taupō's 2019 unrest</em> [Master'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., & Wadsworth, F. B. (2021). Volcanic unrest at Taupo ̄ volcano in 2019: Causes, mechanisms and implications. Geochemistry, Geophysics, Geosystems, e2021GC009803.</p> <p>The data is presented in .csv files, in the same format as MFAST output, (http://mfast-package.geo.vuw.ac.nz), in which each column is:</p> <p>1. 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 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. 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. Delay time between fast and slow shear wave in seconds.</p> <p>23. Angle of the orientation of the fast shear wave (φ), in degrees from North.</p> <p>24. Error of φ in degrees, one standard deviation.</p> <p>25. Angle of incidence at the station, measured against a horizontal plane in degrees, where 0 means vertical incidence.</p> <p>26. Not used</p> <p>27. Type of measurement. This field contains the measurement code that is used, the number of measurement window start times and the number of window end times.</p> <p>28. Not used</p> <p>29. Not used</p> <p>30. Nyquist frequency of the event in Hz.</p> <p>31. Evaluation of the measurement quality.</p> <p>32. Lower corner frequency of the bandpass filter in Hz.</p> <p>33. Higher corner frequency of the bandpass filter in Hz.</p> <p>34. Angle between the initial polarisation and the fast orientation in degrees.</p> <p>35. Not used</p> <p>36. Not used</p> <p>37. The maximum value of the eigenvalue of the corrected covariance matrix.</p> <p>38. The number of degrees of freedom in the measurement. </p> <p>39. 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. The S-wave travel time between the earthquake and the station.</p> <p>41. The dominant frequency in the S wave, determined from the frequency at the maximum spectral amplitude.</p>
Shear-wave splitting measurements in the Dead Sea rift
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