New Zealand Wide model 2.3 seismic velocity model for New Zealand
Authors/Creators
- 1. GNS Science, UCalif. Davis
- 2. GNS Science
Description
19-Sept-2024 Full uncompressed versions of the New Zealand Wide 2.3 velocity, Qs and Qp model Tables can be obtained from zenodo.org/records/13799996
New Zealand Wide velocity model 2.3 has seismic velocity for New Zealand developed from local-earthquake tomography studies. It incorporates results from the southern South Island, published in Tectonics, using joint inversion of travel times and ambient noise derived group velocities (Eberhart-Phillips, et al., 2021, 2022). The results from that study have been interpolated and merged into the previous New Zealand Wide model 2.2 (zenodo.org/record/3779523)
The model is provided in tables, where the Spread Function (SF) shows the resolution, such that where SF<4, there is little information.
vlnzw2p3dnxyzltln.tbl.txt
There is also a simul format velocity file.
vlnzw2p3.mod.txt
And map plots with white lines denoting limits of adequate data, from the 2022 Southern South Island paper, and also for all New Zealand.
Figs_SouthernSI_Tect.pdf
mapvpvpvsnzw2p3.pdf
Velocities any point within the 3D gridded models are 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. Density has been included in the velocity table, by using an empirical relationship (Gardner et al., 1974; Hill, 1978).
Files
Figs_SouthernSI_Tect.pdf
Files
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Additional details
Related works
- Has part
- 10.1029/2021TC007006 (DOI)
- Is new version of
- zenodo.org/record/3779523 (Handle)
References
- Eberhart-Phillips, D., C. Thurber, A. Rietbrock, B. Fry, M. Reyners, and F. Lanza (2021), Simul2017: a flexible program for inversion of earthquake data for 3-D velocity and hypocenters or 3-D Q [Software], Zenodo, https://zenodo.org/record/5746047, doi: 10.5281/zenodo.5746047
- Eberhart-Phillips, D., P. Upton, M. Reyners, D. J. A. Barrell, B. Fry, S. Bourguignon, and E. Warren-Smith (2022), The influence of basement terranes on tectonic deformation: joint earthquake travel-time and ambient noise tomography of the southern South Island, New Zealand, Tectonics, 41, doi:10.1029/2021TC007006.
- Gardner, G. H. F., L. W. Gardner, and A. R. Gregory (1974), Formation velocity and density - the diagnostic basics for stratigraphic traps, Geophysics, 39, 770-780.
- Hill, D. P. (1978), Seismic evidence for the structure and Cenozoic tectonics of the Pacific Coast States, in Cenozoic Tectonics and Regional Geophysics of the Western Cordillera, edited by R. B. Smith and G. P. Eaton, pp. 145-174.