scholarly journals New Zealand seismic hazard analysis

1985 ◽  
Vol 18 (4) ◽  
pp. 313-322
Author(s):  
T. Matuschka ◽  
K. R. Berryman ◽  
A. J. O'Leary ◽  
G. H. McVerry ◽  
W. M. Mulholland ◽  
...  
Keyword(s):  
New Zealand ◽  
Seismic Hazard ◽  
Seismic Design ◽  
Hazard Analysis ◽  
Response Spectra ◽  
Seismic Hazard Analysis ◽  
Return Periods ◽  
Acceleration Response ◽  
Ground Shaking ◽  
Horizontal Acceleration

The results of a seismic hazard analysis for the country by the Seismic Risk Subcommittee (SRS) of the Standards Association are presented. The SRS was formed in 1979 to advise the Standards Association Loadings Code Amendments Committee on the frequency and level of earthquake ground shaking throughout New Zealand. Results of the SRS study are in terms of estimates of five percent damped horizontal acceleration response spectra for 50, 150, 450 and 1000 year return periods. It is intended that these results will form the basis for developing seismic design response spectra for the proposed new Loadings Code (NZS 4203).

scholarly journals Uncertainties in attenuation relations for New Zealand seismic hazard analysis

1986 ◽  
Vol 19 (1) ◽  
pp. 28-39 ◽  
Author(s):  
G. H. McVerry
Keyword(s):  
New Zealand ◽  
Seismic Hazard ◽  
Hazard Analysis ◽  
Response Spectrum ◽  
Strong Motion ◽  
Seismic Hazard Analysis ◽  
Ground Acceleration ◽  
Attenuation Relations ◽  
Ground Shaking ◽  
Acceleration Data

Probabilistic techniques for seismic hazard analysis have
come into vogue in New Zealand for both the assessment of major projects and the development and review of seismic design codes. However, there are considerable uncertainties in the modelling
 of the strong-motion attenuation, which is necessarily based largely on overseas data. An excellent agreement is obtained between an average 5% damped response spectrum for New Zealand alluvial sites in the 20 to 59 km distance range and 5.4 to 6.0 magnitude class and that given by a Japanese model. Unfortunately, this corresponds to only about half the amplitude levels of 150 year spectra relevant to code design. The much more rapid decay
of ground shaking with distance in New Zealand has led to a considerable modification based on maximum ground acceleration
data from the Inangahua earthquake of the distance-dependence
of the Japanese response spectra model. Less scatter in New Zealand data has resulted in adopting a lower standard deviation for the attenuation model, which is important in reducing the considerable "probabilistic enhancement" of the hazard estimates. Regional differences in attenuation shown by intensities are difficult to resolve from the strong-motion acceleration data, apart from lower accelerations in Fiordland.

scholarly journals Seismic hazard analysis and design loads

1985 ◽  
Vol 18 (2) ◽  
pp. 139-150
Author(s):  
J. B. Berrill
Keyword(s):  
New Zealand ◽  
Seismic Hazard ◽  
Hazard Analysis ◽  
Response Spectra ◽  
Earthquake Risk ◽  
Acceleration Response ◽  
Subsequent Work ◽  
Analysis And Design ◽  
Design Loads ◽  
Loading Scheme

This article briefly reviews the seismic design load and zoning scheme proposed by the NZNSEE Bridge Study Group and discusses subsequent work in improving the underlying estimates of New Zealand seismic hazard. The loading scheme, published in 1980, was based on contemporary knowledge of seismic hazard in New Zealand and was innovative in its format which was chosen to give the designer flexibility in selecting the degree of ductility built into the structure, and the return period of the design motions. Difficulty in estimating the design spectra for the NZNSEE study prompted a number of research projects at Canterbury University directed towards a thorough analysis of seismic hazard in New Zealand, expressed directly in terms of acceleration response spectra. These studies, together with complementary work by the SANZ Relative Earthquake Risk Subcommittee are described and discussed.

scholarly journals Evaluation of seismic design parameters for the museum of New Zealand site

1995 ◽  
Vol 28 (2) ◽  
pp. 118-133 ◽  
Author(s):  
J. H. Wood ◽  
G. R. Martin
Keyword(s):  
New Zealand ◽  
Seismic Design ◽  
Response Spectra ◽  
Lateral Spreading ◽  
Design Parameters ◽  
Acceleration Response ◽  
Ground Shaking ◽  
Acceleration Response Spectra ◽  
Time Histories ◽  
Strong Ground

Investigations carried out to evaluate the seismic design parameters, including acceleration response spectra and time-histories, for the design of the Museum of New Zealand, Te Papa Tongarewa, on the Wellington waterfront are described. The procedures used to assess the site stability under strong ground shaking and to determine the maximum likely lateral spreading and settlements are also summarised.

Preparation of the New Zealand earthquake catalogue for a probabilistic seismic hazard analysis

2001 ◽  
Vol 34 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Peter McGinty
Keyword(s):  
New Zealand ◽  
Seismic Hazard ◽  
Hazard Analysis ◽  
Large Earthquake ◽  
Return Time ◽  
Earthquake Catalogue ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Data Sets

The seismic hazard from ground motions during a New Zealand earthquake is variable, and is dependent on the different tectonic processes that occur throughout the country. A modem probabilistic seismic hazard analysis (PSHA) combines various data sets to take account of these different environmental effects and rates of occurrence. Earthquake catalogue data can be used to give the rate of background or distributed seismicity in historical times, while paleoseismic data can be used to constrain the return time of large earthquakes. The background seismicity is assumed to occur as a time-independent Poisson process. To apply this assumption to a new PSHA of New Zealand, completeness levels for the New Zealand earthquake catalogue were established, and aftershocks or clusters of events that occurred close together in both space and time were removed from the catalogue. The level of hazard in a region can be depth-dependent, that is the risk of a large earthquake may come from a shallow crustal event or a deep subduction zone event, both having the same epicentral location but resulting in different levels of damage. The New Zealand earthquake catalogue has too many events that have been assigned restricted depths to be ignored. These events have been statistically redistributed into shallow crustal zones or deep subducted slab zones based on the last eleven years of catalogue data, when improvements in technology have reduced the number of restricted events.

Probabilistic seismic hazard analysis and design earthquakes: Closing the loop

1995 ◽  
Vol 85 (5) ◽  
pp. 1275-1284 ◽  
Author(s):  
Robin K. McGuire
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Large Earthquake ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Ground Shaking ◽  
Uniform Hazard Spectrum ◽  
Analysis And Design ◽  
Design Earthquake

Abstract Probabilistic seismic hazard analysis (PSHA) is conducted because there is a perceived earthquake threat: active seismic sources in the region may produce a moderate-to-large earthquake. The analysis considers a multitude of earthquake occurrences and ground motions, and produces an integrated description of seismic hazard representing all events. For design, analysis, retrofit, or other seismic risk decisions a single “design earthquake” is often desired wherein the earthquake threat is characterized by a single magnitude, distance, and perhaps other parameters. This allows additional characteristics of the ground shaking to be modeled, such as duration, nonstationarity of motion, and critical pulses. This study describes a method wherein a design earthquake can be obtained that accurately represents the uniform hazard spectrum from a PSHA. There are two key steps in the derivation. First, the contribution to hazard by magnitude M, distance R, and ɛ must be maintained separately for each attenuation equation used in the analysis. Here, ɛ is the number of standard deviations that the target ground motion is above or below the median predicted motion for that equation. Second, the hazard for two natural frequencies (herein taken to be 10 and 1 Hz) must be examined by seismic source to see if one source dominates the hazard at both frequencies. This allows us to determine whether it is reasonable to represent the hazard with a single design earthquake, and if so to select the most-likely combination of M, R, and ɛ (herein called the “beta earthquake”) to accurately replicate the uniform hazard spectrum. This closes the loop between the original perception of the earthquake threat, the consideration of all possible seismic events that might contribute to that threat, and the representation of the threat with a single (or few) set of parameters for design or analysis.

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