Journal
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
Volume 63, Issue 1, Pages 110-127Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00288306.2019.1636830
Keywords
New Zealand; velocity model; ground motion simulation; regional velocity representation; geologic subregions
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Funding
- University of Canterbury
- QuakeCoRE
- National Hazards Research Platform (NHRP)
- Royal Society of New Zealands (RSNZ)
- QuakeCoRE, a New Zealand Tertiary Education Commission
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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, Kaikoura, Marlborough, Waiau, Hanmer and Cheviot sedimentary basins embedded within an existing regional travel-time tomography-based velocity model for the shallow crust.
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