Southern South Island, New Zealand, seismic observations and velocity model for Tectonics 2021TC007006

This archive has data and results from the Tectonics paper, “The influence of basement terranes on tectonic deformation: joint earthquake travel-time and ambient noise tomography of the southern South Island, New Zealand” (Eberhart-Phillips et al., 2022; doi:10.1029/2021TC007006).  That work incorporated earthquake observations from the 2014-2015 Otago temporary broadband network.  Group velocity observations are in ‘groupvel_obs_otaf_T5_T9.vgsw’.  We used earthquakes observed on the COSA temporary network.  The Otago-COSA travel-times and hypocenters are in ‘tt_archive.tar’.  The Otago earthquakes were evaluated within Seiscomp.  Those observation files, which include polarity, are in ‘polarity_bulletin.tar’.  We did not use the polarities in the Tectonics paper, but we archive them here for completeness.  The waveform data will be available from IRIS.

The southern South Island 3-D velocity model is provided in the table ‘vlotf30xyzltlnDWSSF.mod’, with DWS (derivative weight sum) describing the distribution of data, and SF (spread function) describing the resolution averaging. Later on, this will be merged into the New Zealand wide velocity model version 2.3, which will be placed on Zenodo.