A5059264396- Seismic Waves and Analysis
- Seismic Performance and Analysis
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Structural Health Monitoring Techniques
- Earthquake Detection and Analysis
- Seismic Imaging and Inversion Techniques
- Urban Transport and Accessibility
- Primary Care and Health Outcomes
- Economic and Environmental Valuation
- Geophysics and Sensor Technology
- Transportation Planning and Optimization
- Chronic Disease Management Strategies
- Wind and Air Flow Studies
- Healthcare Policy and Management
- Geotechnical Engineering and Underground Structures
- High-pressure geophysics and materials
- Geological Modeling and Analysis
- Geotechnical and construction materials studies
- Anomaly Detection Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Masonry and Concrete Structural Analysis
- Landslides and related hazards
- NMR spectroscopy and applications
- Seismic and Structural Analysis of Tall Buildings
GNS Science
2017-2023
Plant & Food Research
2022-2023
Compass (United States)
2022
University of Auckland
2012-2018
Université Gustave Eiffel
2011
Institut des Sciences de la Terre
2011
Université Joseph Fourier
2011
Centre National de la Recherche Scientifique
2011
Research Article| April 05, 2017 The 2016 Kaikōura, New Zealand, Earthquake: Preliminary Seismological Report A. Kaiser; Kaiser aGNS Science, P.O. Box 30‐368, Lower Hutt 5040, Zealanda.kaiser@gns.cri.nze.danastasio@gns.cri.nzs.bannister@gns.cri.nz Search for other works by this author on: GSW Google Scholar N. Balfour; Balfour B. Fry; Fry C. Holden; Holden Litchfield; Litchfield M. Gerstenberger; Gerstenberger E. D’Anastasio; D’Anastasio Horspool; Horspool G. McVerry; McVerry J. Ristau;...
The observable decay with frequency ( f ) of Fourier amplitude spectra for ground-motion recordings is controlled by a parameter κ : exp(- πκf ). We analyze data from the KiK-net network, which composed stations paired sensors, one at surface and in borehole. This study estimates all stations, using earthquakes recorded between 1998 2006. An inversion scheme used to separate site, source, path contributions . We correlate site component ), estimated depth, different S -wave velocity...
This article summarises work that has been undertaken to compile the New Zealand Strong Motion Database, which is intended be a significant resource for both researchers and practitioners. The database contains 276 earthquakes were recorded by strong motion instruments from GeoNet earlier network operators. events have moment magnitudes ranging 3.5 7.8. A total of 134 these (49%) classified as occurring in overlying crust, with 33 (12%) located on Fiordland subduction interface 7 Hikurangi...
The determination of near-surface attenuation for hard rock sites is an important issue in a wide range seismological applications, particularly seismic hazard analysis. In this article we choose six to very-hard (Vs30 1030–3000 m s–1) and apply analysis methods measure the observed at distance based on simple exponential decay model with whole-path operator κr. κr values are subsequently decoupled from path (Q) so as obtain estimates (κ0). Five employed which can be split into two groups:...
The New Zealand Strong Motion Database provides a wealth of new strong motion data for engineering applications. In order to utilise these in ground prediction, characterisation key site parameters at each the ~497 past and present GeoNet stations represented database is required. Here, we compilation complete set metadata database, including four parameters: i) NZS1170.5 subsoil classification, ii) time-averaged shear-wave velocity depth 30 m (Vs30), iii) fundamental period (Tsite) iv) 1000...
The 2010-2012 Canterbury earthquake sequence generated a large number of near-source recordings, with the vast majority events occurring within 30 km Christchurch, New Zealand's second largest city.We utilize dataset to estimate site attenuation parameter, κ 0 , at seven rock and stiff-soil stations in GeoNet seismic network.As part this study, an orientationindependent definition is proposed minimize influence observed highfrequency 2D effects.Minimum magnitude limits for traditional...
Following the 2016 M7.8 Kaikōura earthquake, a time-varying seismic hazard model (KSHM) was developed to inform decision-making for reinstatement of road and rail networks in northern South Island. The source is sum gridded 100-year earthquake clustering an updated fault model. comprises long-term, medium-term short-term components. constructed as 100 annual forecasts. A discounting method trades off expected occurrences distant future against those near future. includes updates account...
SUMMARY Seismic interferometry is an established method for monitoring the temporal evolution of Earth’s physical properties. We introduce a new technique to improve precision and resolution seismic studies based on deep learning. Our uses convolutional denoising autoencoder, called ConvDeNoise, denoise ambient field correlation functions. The can be applied traditional two-station cross-correlation functions but this study focuses single-station (SC) SC are computed by cross correlating...
An important component of seismic hazard assessment is the prediction potential ground motion generated by a given earthquake source. In New Zealand studies, it commonplace for analysts to only adopt one or two models predicting motion, which does not capture epistemic uncertainty associated with prediction. This study analyses suite and international against Strong Motion Database, both crustal earthquakes in Hikurangi subduction zone. It found that, general, foreign perform similarly...
ABSTRACT We document the first use of fragile geologic features (FGFs) to set formal design earthquake motions for a major existing engineered structure. The safety evaluation (SEE) spectrum Clyde Dam, New Zealand (the mean 10,000 yr, ka, return period response spectrum) is developed in accordance with official guidelines and utilizes constraints provided by seven precariously balanced rocks (PBRs) located 2 km from dam site local active Dunstan fault. PBRs are hanging wall Deterministic PBR...
During the Canterbury earthquake sequence, observed level of ground motion on soft soils Christchurch was very strong and highly variable. Many studies are now emerging that analyse amplification effect these soils, usually by estimating a frequency-dependent function relative to rock outcrop station, or ‘reference site’. If has its own due weathering topographic effects, then calculated for soil sites can be compromised. This study examines ten seismic stations in determine best reference...
The corrected 2010 New Zealand National Seismic Hazard Model has been adapted for use in the Global Earthquake Model’s OpenQuake engine through an extensive benchmarking exercise with GNS Science’s legacy Fortran code. Resolution of differences between code and result hazard curve output comparisons discrepancies less than 3% nationally remaining highlight challenges faced when moving away from in-house OpenQuake’s multiple varied computation options both risk consistent, software-friendly...
Abstract Stress drops calculated from source spectral studies currently show larger variability than what is implied by empirical ground motion models. One of the potential origins inflated simplified model‐fitting techniques used in most studies. This study examines a variety methods and shows that choice method can explain some discrepancy. The preferred Bayesian hierarchical modeling, which reduce bias, better quantify uncertainties, allow additional effects to be resolved. Two case...
Quantifying the near-surface attenuation of seismic waves at a given location can be important for hazard analysis high-frequency ground motion. This study calculates site parameter, κ0, 41 seismograph locations in New Zealand. Combined with results previous study, total 46 κ0 values are available across The compare well t* studies, revealing high volcanic arc and forearc ranges, low South Island. However, site-specific analyses, there is need to calculate away from location. For these...
Research Article| January 02, 2018 On Durations, Peak Factors, and Nonstationarity Corrections in Seismic Hazard Applications of Random Vibration Theory Chris Van Houtte; Houtte aGNS Science, 1 Fairway Drive, P.O. Box 30‐368, Lower Hutt 5040, New Zealand, c.vanhoutte@gns.cri.nzcAlso at University Auckland, Zealand. Search for other works by this author on: GSW Google Scholar Tam Larkin; Larkin bDepartment Civil Environmental Engineering, Faculty Private Bag 92019, Auckland Mail Centre, 1142,...
Introduction New Zealand general practice and primary care is currently facing significant challenges opportunities following the impact of coronavirus disease 2019 (COVID-19) pandemic introduction health sector reform. For future sustainability, it important to understand workload associated with differing levels patient case mix seen in practice. Aim To assess morbidity concomitant socio-economic deprivation among practices within a large organisation (PHO) Māori provider network. Methods...
ABSTRACT This article describes the release of GNS Science Canterbury Seismic Hazard Model (CSHM), as implemented in Global Earthquake Model’s OpenQuake software. Time‐varying models are for 50 yr time period between 2014 and 2064, well 1 from September 2018 to 31 August 2019. Previous implementations have been confined in‐house software, although source model input files made publicly available, this implementation improves levels visibility, documentation, version control. Because...
The fundamental site period, T, is a key parameter for classification in NZS 1170.5:2004. Many sites New Zealand will fall into classes C and D, where the boundary between T = 0.6 seconds. 1170.5 offers several methods of determining classification. intent this paper to expand on guide practising engineers towards more accurate efficient period. We review calculate shear-wave velocity, then give specific examples calculating period five types soil profile (uniform layer, velocity increasing...
Seismic interferomestry is an established method for monitoring the temporal evolution of Earths physical properties. We introduce a new technique to improve precision and resolution seismic studies based on deep learning. Our uses convolutional denoising autoencoder, called ConvDeNoise, denoise ambient field correlation functions. The can be applied traditional two-station cross-correlation functions but this study focuses single-station (SC) SC are computed by cross correlating different...
Introduction Risk stratification tools in primary care may help practices better identify high-risk patients and plan for their treatment. Patients of all ages can be at high risk acute hospital admissions. Aim We aim to improve existing by using larger datasets, accounting practice-level variations hospitalisation rates read-code quality. Methods This work has derived an admission tool the Wellington, Kāpiti Coast Wairarapa regions New Zealand. An open cohort, starting 1 March 2017...