Seismic hazard assessment and its uncertainty for the central part of northern Algeria

This study presents a probabilistic seismic hazard assessment for the central part of northern Algeria using two complementary seismic models: a fault-based model and a gridded seismicity model. Two ground-motion attenuation equations were chosen using the Pacific Earthquake Engineering Research Cen...

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Detalhes bibliográficos
Autores: Hamdache, M., Peláez, J.A., Henares, J., Sawires, R.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Recursos:Universidad de Jaén
Repositorio:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
OAI Identifier:oai:ruja.ujaen.es:10953/6854
Acesso em linha:https://doi.org/10.1007/s00024-022-03066-0
https://hdl.handle.net/10953/6854
Access Level:acceso abierto
Palavra-chave:Fault-based model
Gridded seismicity model
Seismic hazard
Uniform hazard spectra
Disaggregation
Control earthquake
Algeria
55
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spelling Seismic hazard assessment and its uncertainty for the central part of northern AlgeriaHamdache, M.Peláez, J.A.Henares, J.Sawires, R.Fault-based modelGridded seismicity modelSeismic hazardUniform hazard spectraDisaggregationControl earthquakeAlgeria55This study presents a probabilistic seismic hazard assessment for the central part of northern Algeria using two complementary seismic models: a fault-based model and a gridded seismicity model. Two ground-motion attenuation equations were chosen using the Pacific Earthquake Engineering Research Center Next-Generation models, as well as local and regional ones. The ranking method was used to assess their ability to gather accurate data. To account for epistemic uncertainty in both components of the assessment, the seismic hazard was computed using a logic tree approach. Expert judgment and data testing were used to evaluate the weights assigned to individual ground-motion prediction equations. The seismic hazard maps depicted the obtained results in terms of spectral accelerations at oscillation periods of 0.0, 0.2, and 1.0 s, with 10% and 5% probabilities of exceedance in 50 years, and for soil types B, B/C, C, and C/D, as defined by the National Earthquake Hazards Reduction Program. From the analysis, the uncertainty is expressed as both a 95% confidence band and the coefficient of variation (COV). Annual frequencies of exceedance and hazard curves were estimated for the selected cities, as well as uniform hazard spectra for the previously quoted probabilities of exceedance and the soil types considered. Peak ground acceleration values of 0.44g and 0.38g were reported for the B/C soil type in the cities of Algiers and Blida, respectively, for a return period of 475 years. Seismic maps for the selected return periods depicting the classification of the estimated values are also displayed in terms of very high, high, medium, low and very low degrees of reliability. Furthermore, a seismic hazard disaggregation analysis in terms of magnitude, distance, and azimuth was carried out. The primary goal of such analyses is to determine the relative contribution of different seismic foci and sources to seismic hazard at specific locations. Thus, for each studied city, for the considered return periods and for the soil type B/C, the so-called control or modal earthquake was estimated. At Algiers, events with magnitudes Mw 5.0–5.5 and distances of less than 10 km contribute the most to the mean seismic hazard over a 475-year period. However, for the same return period, those events with Mw 7.0–7.5 and located between 10 and 20 km away contribute the most to the seismic hazard at Tipaza.The second author is grateful for partial financial support for this research work through the Programa Operativo FEDER Andalucía 2014–2020—Call by the University of Jaén, 2018.Springer Nature202620262022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1007/s00024-022-03066-0https://hdl.handle.net/10953/6854reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaéninstname:Universidad de JaénInglésPure and Applied GeophysicsCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccessoai:ruja.ujaen.es:10953/68542026-06-24T12:41:07Z
dc.title.none.fl_str_mv Seismic hazard assessment and its uncertainty for the central part of northern Algeria
title Seismic hazard assessment and its uncertainty for the central part of northern Algeria
spellingShingle Seismic hazard assessment and its uncertainty for the central part of northern Algeria
Hamdache, M.
Fault-based model
Gridded seismicity model
Seismic hazard
Uniform hazard spectra
Disaggregation
Control earthquake
Algeria
55
title_short Seismic hazard assessment and its uncertainty for the central part of northern Algeria
title_full Seismic hazard assessment and its uncertainty for the central part of northern Algeria
title_fullStr Seismic hazard assessment and its uncertainty for the central part of northern Algeria
title_full_unstemmed Seismic hazard assessment and its uncertainty for the central part of northern Algeria
title_sort Seismic hazard assessment and its uncertainty for the central part of northern Algeria
dc.creator.none.fl_str_mv Hamdache, M.
Peláez, J.A.
Henares, J.
Sawires, R.
author Hamdache, M.
author_facet Hamdache, M.
Peláez, J.A.
Henares, J.
Sawires, R.
author_role author
author2 Peláez, J.A.
Henares, J.
Sawires, R.
author2_role author
author
author
dc.subject.none.fl_str_mv Fault-based model
Gridded seismicity model
Seismic hazard
Uniform hazard spectra
Disaggregation
Control earthquake
Algeria
55
topic Fault-based model
Gridded seismicity model
Seismic hazard
Uniform hazard spectra
Disaggregation
Control earthquake
Algeria
55
description This study presents a probabilistic seismic hazard assessment for the central part of northern Algeria using two complementary seismic models: a fault-based model and a gridded seismicity model. Two ground-motion attenuation equations were chosen using the Pacific Earthquake Engineering Research Center Next-Generation models, as well as local and regional ones. The ranking method was used to assess their ability to gather accurate data. To account for epistemic uncertainty in both components of the assessment, the seismic hazard was computed using a logic tree approach. Expert judgment and data testing were used to evaluate the weights assigned to individual ground-motion prediction equations. The seismic hazard maps depicted the obtained results in terms of spectral accelerations at oscillation periods of 0.0, 0.2, and 1.0 s, with 10% and 5% probabilities of exceedance in 50 years, and for soil types B, B/C, C, and C/D, as defined by the National Earthquake Hazards Reduction Program. From the analysis, the uncertainty is expressed as both a 95% confidence band and the coefficient of variation (COV). Annual frequencies of exceedance and hazard curves were estimated for the selected cities, as well as uniform hazard spectra for the previously quoted probabilities of exceedance and the soil types considered. Peak ground acceleration values of 0.44g and 0.38g were reported for the B/C soil type in the cities of Algiers and Blida, respectively, for a return period of 475 years. Seismic maps for the selected return periods depicting the classification of the estimated values are also displayed in terms of very high, high, medium, low and very low degrees of reliability. Furthermore, a seismic hazard disaggregation analysis in terms of magnitude, distance, and azimuth was carried out. The primary goal of such analyses is to determine the relative contribution of different seismic foci and sources to seismic hazard at specific locations. Thus, for each studied city, for the considered return periods and for the soil type B/C, the so-called control or modal earthquake was estimated. At Algiers, events with magnitudes Mw 5.0–5.5 and distances of less than 10 km contribute the most to the mean seismic hazard over a 475-year period. However, for the same return period, those events with Mw 7.0–7.5 and located between 10 and 20 km away contribute the most to the seismic hazard at Tipaza.
publishDate 2022
dc.date.none.fl_str_mv 2022
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1007/s00024-022-03066-0
https://hdl.handle.net/10953/6854
url https://doi.org/10.1007/s00024-022-03066-0
https://hdl.handle.net/10953/6854
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Pure and Applied Geophysics
dc.rights.none.fl_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
instname:Universidad de Jaén
instname_str Universidad de Jaén
reponame_str RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
collection RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
repository.name.fl_str_mv
repository.mail.fl_str_mv
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