Seismic anisotropy dataset from Illsley-Kemp et al., G3, 2019 (10.1029/2019GC008529)

The datasets provided here are the seismic anisotropy results for the four seperate regions of New Zealand, reported and discussed in Illsley-Kemp et al., Geochemistry, Geophysics, Geosystems, 2019 (10.1029/2019GC008529). 

If you use this date, please cite the following paper:

Illsley-Kemp, F., Savage, M. K., Wilson, C. J. N., & Bannister, S., 2019, 10.1029/2019GC008529. Mapping Stress and Structure from Subducting Slab to Magmatic Rift: Crustal Seismic Anisotropy of the North Island, New Zealand. Geochemistry, Geophysics, Geosystems.

The data are csv files in the same format as MFAST output (http://mfast-package.geo.vuw.ac.nz), with each column corresponding to the following:

1: Result ID

2: Station code

3: Station latitude

4: Station longitude

5: Earthquake ID (after GeoNet)

6: Year

7: Julian day on which the event occurred, with decimal digits giving the fraction of the day

8: Earthquake latitude

9: Earthquake longitude

10: Earthquake-station distance (km)

11: Earthquake depth (km)

12: Earthquake magnitude

13: Back azimuthal angle

14: Initial polarisation of the shear wave in degrees

15: Error of Spol in degrees, one standard deviation

16: Start time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0

17: End time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0

18: Not used

19: Not used

20: Signal to noise ratio

21: Delay time (δt) between fast and slow shear wave in seconds

22: Error of δt in degrees, one standard deviation

23: Angle of the orientation of the fast shear wave (φ), in degrees from North

24: Error of φ in degrees, one standard deviation

25: Angle of incidence at the station, measured against a horizontal plane in degrees, where 0 means vertical incidence

26: Not used

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

28: Not used

29: Not used

30: Nyquist frequency of the event in Hz

31: Evaluation of the measurement quality

32: Lower corner frequency of the bandpass filter in Hz

33: Higher corner frequency of the bandpass filter in Hz

34: Angle between the initial polarisation and the fast orientation in degrees

35: Not used

36: Not used

37: The maximum value of the eigenvalue of the corrected covariance matrix

38: The number of degrees of freedom in the measurement

39: The minimum value of the eigenvalue of the covariance matrix before it was scaled to have the 95% confidence level set to 1

40: The S-wave travel time between the earthquake and the station

41: The dominant frequency in the S wave, determined from the frequency at the maximum spectral amplitude