Methodology and computational implementation of a New Zealand Velocity Model (NZVM2.0) for broadband ground motion simulation

This paper presents a generalised velocity model construction methodology, its computational implementation, and application in the construction of a New Zealand Velocity Model (NZVM2.0) for use in physics-based broadband ground motion simulation. The methodology utilises multiple datasets spanning...

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Bibliographic Details
Published in:New Zealand journal of geology and geophysics 2020-01, Vol.63 (1), p.110-127
Main Authors: Thomson, Ethan M., Bradley, Brendon A., Lee, Robin L.
Format: Article
Language:English
Subjects:
Broadband
Computer applications
Computer simulation
Construction
Datasets
geologic subregions
Ground motion
ground motion simulation
Methodology
Motion simulation
New Zealand
Physics
regional velocity representation
Representations
Sedimentary basins
Simulation
Tomography
Travel time
Velocity
velocity model
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Summary:This paper presents a generalised velocity model construction methodology, its computational implementation, and application in the construction of a New Zealand Velocity Model (NZVM2.0) for use in physics-based broadband ground motion simulation. The methodology utilises multiple datasets spanning different length scales, which is enabled via the use of modular subregions, geologic surfaces, and parametric representations of crustal velocity. A number of efficiency-related workflows to decrease the overall computational construction time are employed, while maintaining the flexibility and extensibility to incorporate additional datasets and refined velocity parameterisations as they become available. The methodology and computational implementation processes are then applied for development of a New Zealand Velocity Model (NZVM2.0) for use in broadband ground motion simulation. The model comprises explicit representations of the Canterbury, Wellington, Nelson-Tasman, Kaikōura, Marlborough, Waiau, Hanmer and Cheviot sedimentary basins embedded within an existing regional travel-time tomography-based velocity model for the shallow crust.
ISSN:0028-8306
1175-8791
DOI:10.1080/00288306.2019.1636830