New Zealand Wide model 2.3 Qs and Qp models for New Zealand, 
updated for Kaikoura

Donna Eberhart-Phillips,  Stephen Bannister,  Martin Reyners,  
Susan Ellis, Federica Lanza

The Qs and Qp New Zealand Wide models 2.3 incorporate the 
results from the Kaikoura region using aftershocks, published in 
Geophysical Journal International (Eberhart-Phillips, et al. 
2021).
The results from that study have been interpolated and merged 
into the previous New Zealand Wide model 2.2 
(zenodo.org/record/3779523). There is no update of the Vp and 
Vp/Vs models.


The models are provided in tables, where the Spread Function 
(SF) shows the resolution, such that where SF<4, there is little 
information. 
Qpnzw2p3xyzltln.tbl.txt
Qsnzw2p3xyzltln.tbl.txt

There are also simul format Q files.
Qpnzw2p2.mod.txt
Qsnzw2p2.mod.txt

Map plots of the Q models, resolution and data
KaikouraQ_figures.pdf

Q at any point within the 3D gridded models is defined by 
linearly interpolating between nodes.
The models use Transverse Mercator coordinate transformation 
with a central meridian= 173, and counterclockwise rotation of 
140.  Earth-flattening transformation is used for velocity 
during ray-tracing. The depths are relative to sea-level. 

Reference:

Eberhart-Phillips, D., S. Ellis, F. Lanza, and S. Bannister 
(2021), Heterogeneous material properties – as inferred from 
seismic attenuation - influenced multiple fault rupture and 
ductile creep of the Kaikoura Mw 7.8 earthquake, New 
Zealand, Geophys. J. Int., doi:10.1093/gji/ggab272.