Seismic Hazard in Terms of Spectral Accelerations and Uniform Hazard Spectra in Northern Algeria

2006 ◽  
Vol 163 (1) ◽  
pp. 119-135 ◽  
Author(s):  
José A. Peláez ◽  
M. Hamdache ◽  
Carlos López Casado
Keyword(s):  
Seismic Hazard ◽  
Uniform Hazard Spectra ◽  
Northern Algeria ◽  
Spectral Accelerations

Vector-Valued Uniform Hazard Spectra

2012 ◽  
Vol 28 (4) ◽  
pp. 1549-1568 ◽  
Author(s):  
Shun-Hao Ni ◽  
De-Yi Zhang ◽  
Wei-Chau Xie ◽  
Mahesh D. Pandey
Keyword(s):  
Seismic Hazard ◽  
Seismic Design ◽  
Hazard Analysis ◽  
Occurrence Rate ◽  
Simultaneous Occurrence ◽  
Uniform Hazard Spectra ◽  
Design Spectrum ◽  
Performance Based Seismic Design ◽  
Design Earthquake ◽  
Vector Valued

Uniform hazard spectra (UHS) have been used as design earthquakes in several design codes. However, as the results from scalar probabilistic seismic hazard analysis (PSHA), UHS do not provide knowledge about the simultaneous occurrence of spectral accelerations at multiple vibration periods. The concept of a single “design earthquake” is then lost on a UHS. In this study, a vector-valued PSHA combined with scalar PSHA is applied to establish an alternative design spectrum, named vector-valued UHS (VUHS). Vector-valued seismic hazard deaggregation (SHD) is also performed to determine the design earthquake in terms of magnitude, distance, and occurrence rate for the VUHS. The proposed VUHS preserves the essence of the UHS and can also be interpreted as a single design earthquake. To simplify the procedure for generating the VUHS, so that they can be easily incorporated into performance-based seismic design, an approximate method is also developed.

A Preliminary Seismic Hazard Modelling in Northern Algeria

2019 ◽  
pp. 231-235
Author(s):  
Mohamed Hamdache ◽  
José A. Peláez ◽  
AbdelKarim Yelles-Chaouche ◽  
Ricardo Monteiro ◽  
Mario Marques ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Northern Algeria

Application of inelastic response spectra derived from seismic hazard spectral ordinates for Canada

1996 ◽  
Vol 23 (5) ◽  
pp. 1051-1063 ◽  
Author(s):  
J. L. Humar ◽  
M. A. Rahgozar
Keyword(s):  
Seismic Hazard ◽  
Response Spectra ◽  
Reduction Factor ◽  
Reliable Estimate ◽  
Spectral Acceleration ◽  
Hazard Maps ◽  
Uniform Hazard Spectra ◽  
Spectral Curves ◽  
Modification Factor ◽  
Recorded Data

The Geological Survey of Canada is currently producing a suite of new hazard maps for Canada. These maps take into account the additional recorded data obtained during the past 13 years, as well as the new geological and tectonic information that has recently become available. They provide elastic spectral acceleration values for a uniform probability of exceedance of 10% in 50 years. A method of using the uniform hazard spectral values to obtain design response spectral curves for different values of ductility is presented here. The method uses two spectral values obtained from the hazard maps, the peak spectral acceleration for the site and the spectral acceleration corresponding to a period of 0.5 s. Empirical expressions are developed to represent the design response spectra. It is shown that by using inelastic spectral accelerations rather than the elastic spectral values in association with a reduction factor, the new method provides a more reliable estimate of the design forces. Key words: uniform hazard spectra; inelastic spectra, seismic design forces, force modification factor, foundation factor, seismic hazard for Canada.

Impact of using updated seismic information on seismic hazard in western Canada

2010 ◽  
Vol 37 (4) ◽  
pp. 562-575 ◽  
Author(s):  
K. Goda ◽  
H. P. Hong ◽  
G. M. Atkinson
Keyword(s):  
Seismic Hazard ◽  
Recurrence Relations ◽  
Hazard Model ◽  
Sensitivity Analyses ◽  
Western Canada ◽  
Earthquake Catalog ◽  
Uniform Hazard Spectra ◽  
New Information ◽  
Proposed Model ◽  
The Impact

This study provides a preliminary assessment of the impact of new seismological information on the existing seismic hazard model, as implemented in the 2005 National building code of Canada (NBCC); this seismic hazard model was actually developed in the early 1990s, and thus there is significant new information available in the literature since then. A reassessment of seismic hazard is carried out by updating magnitude-recurrence relations based on the earthquake catalog up to the end of 2006, including conversion of all earthquake magnitudes to a homogenous moment magnitude scale. The recent ground-motion prediction equations, which update the knowledge base used in the 2005 NBCC, are also used. Focusing on Vancouver and Victoria, sensitivity analyses are carried out to investigate both individual and combined impacts of these updates on the uniform hazard spectra. The proposed model can be used as a guide to the direction in which future seismic hazard models for western Canada may move.

Probabilistic seismic hazard analyses and obtaining uniform hazard spectra of Tabriz, Iran

2015 ◽  
Vol 20 (5) ◽  
pp. 1813-1823 ◽  
Author(s):  
H. R. Razeghi ◽  
G. Ghodrati Amiri ◽  
S. A. Razavian Amrei ◽  
M. A. Rahimi
Keyword(s):  
Seismic Hazard ◽  
Probabilistic Seismic Hazard ◽  
Uniform Hazard Spectra

scholarly journals Seismic hazard of the Iberian Peninsula: evaluation with kernel functions

2014 ◽  
Vol 14 (5) ◽  
pp. 1309-1323 ◽  
Author(s):  
M. J. Crespo ◽  
F. Martínez ◽  
J. Martí
Keyword(s):  
Seismic Hazard ◽  
Iberian Peninsula ◽  
Spatial Dependence ◽  
Kernel Functions ◽  
Return Periods ◽  
Hazard Maps ◽  
Uniform Hazard Spectra ◽  
Activity Rate ◽  
Attenuation Relationships ◽  
Deep Sources

Abstract. The seismic hazard of the Iberian Peninsula is analysed using a nonparametric methodology based on statistical kernel functions; the activity rate is derived from the catalogue data, both its spatial dependence (without a seismogenic zonation) and its magnitude dependence (without using Gutenberg–Richter's relationship). The catalogue is that of the Instituto Geográfico Nacional, supplemented with other catalogues around the periphery; the quantification of events has been homogenised and spatially or temporally interrelated events have been suppressed to assume a Poisson process. The activity rate is determined by the kernel function, the bandwidth and the effective periods. The resulting rate is compared with that produced using Gutenberg–Richter statistics and a zoned approach. Three attenuation relationships have been employed, one for deep sources and two for shallower events, depending on whether their magnitude was above or below 5. The results are presented as seismic hazard maps for different spectral frequencies and for return periods of 475 and 2475 yr, which allows constructing uniform hazard spectra.

Seismic hazard analysis: a comparative study

2006 ◽  
Vol 33 (9) ◽  
pp. 1156-1171 ◽  
Author(s):  
H P Hong ◽  
K Goda ◽  
A G Davenport
Keyword(s):  
Seismic Hazard ◽  
Seismic Hazard Assessment ◽  
Historical Seismicity ◽  
Hazard Maps ◽  
Uniform Hazard Spectra ◽  
Attenuation Relations ◽  
Seismic Hazard Maps ◽  
Cell Method ◽  
Thiessen Polygon ◽  
The Impact

The quantitative seismic hazard maps for the 1970s National Building Code of Canada were evaluated using the Davenport–Milne method. The Cornell–McGuire method is employed to develop recent seismic hazard maps of Canada. These methods incorporate the information on seismicity, magnitude-recurrence relations, and ground motion (or response) attenuation relations. The former preserves and depends completely on details of the historical seismicity; the latter smoothes the irregular spatial occurrence pattern of the historical seismicity into seismic source zones. Further, the Epicentral Cell method, which attempts to incorporate the preserving and smoothing aspect of these methods, has been developed. However, the impact of the adopted assumptions on the estimated quantitative seismic hazard has not been investigated. This study provides a comparative seismic hazard assessment using the above-mentioned methods and simulation-based algorithms. The analysis results show that overall the Davenport–Milne method gives quasi-circular seismic hazard contours near significant historical events, and the Cornell–McGuire method smoothes the transition of contours. The Epicentral Cell method provides estimates approximately within the former and the latter. Key words: epicentral cell method, probability, seismic hazard, Thiessen polygon, Voronoi, uniform hazard spectra.

scholarly journals Development of seismic hazard maps for the proposed 2005 edition of the National Building Code of Canada

2003 ◽  
Vol 30 (2) ◽  
pp. 255-271 ◽  
Author(s):  
John Adams ◽  
Gail Atkinson
Keyword(s):  
Seismic Hazard ◽  
Earthquake Engineering ◽  
Ground Motions ◽  
Building Code ◽  
National Committee ◽  
Hazard Maps ◽  
Uniform Hazard Spectra ◽  
Earthquake Probability ◽  
Seismic Hazard Maps ◽  
Strong Ground

A new seismic hazard model, the fourth national model for Canada, has been devised by the Geological Survey of Canada to update Canada's current (1985) seismic hazard maps. The model incorporates new knowledge from recent earthquakes (both Canadian and foreign), new strong ground motion relations to describe how shaking varies with magnitude and distance, the newly recognized hazard from Cascadia subduction earthquakes, and a more systematic approach to reference site conditions. Other new innovations are hazard computation at the 2% in 50 year probability level, the use of the median ground motions, the presentation of results as uniform hazard spectra, and the explicit incorporation of uncertainty via a logic-tree approach. These new results provide a more reliable basis for characterizing seismic hazard across Canada and have been approved by the Canadian National Committee on Earthquake Engineering (CANCEE) as the basis of the seismic loads in the proposed 2005 edition of the National Building Code of Canada.Key words: seismic hazard, earthquake, probability, uniform hazard spectrum, maps, Cascadia subduction, strong ground motions, uncertainty, CANCEE, National Building Code of Canada.

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