Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes
It is often case that ground-motion records for a given area of interest are available in relative abundance for small (Mw<5) earthquakes but are practically non-existent for larger earthquakes, which have the potential to cause damage to structures. This is a direct consequence of the almost uni...
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ftccsdartic:oai:HAL:hal-00581343v1 2023-05-15T16:52:52+02:00 Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes Douglas, John Jousset, Philippe Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) European Project: 241321,EC:FP7:ENERGY,FP7-ENERGY-2009-1,GEISER(2010) Reykjavik, Iceland 2011-04-29 https://hal-brgm.archives-ouvertes.fr/hal-00581343 en eng HAL CCSD info:eu-repo/grantAgreement/EC/FP7/241321/EU/Geothermal Engineering Integrating Mitigation of Induced Seismicity in Reservoirs/GEISER hal-00581343 https://hal-brgm.archives-ouvertes.fr/hal-00581343 2nd International Symposium on Strong-motion Earthquake Effects (ISSEE2011) https://hal-brgm.archives-ouvertes.fr/hal-00581343 2nd International Symposium on Strong-motion Earthquake Effects (ISSEE2011), Apr 2011, Reykjavik, Iceland seismic hazard ground-motion prediction equations ground-motion models stochastic models kappa [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/conferenceObject Conference papers 2011 ftccsdartic 2021-10-17T01:54:22Z It is often case that ground-motion records for a given area of interest are available in relative abundance for small (Mw<5) earthquakes but are practically non-existent for larger earthquakes, which have the potential to cause damage to structures. This is a direct consequence of the almost universally observed Gutenberg-Richter relation that a unit increase in magnitude decreases the number of earthquakes observed by a factor of ten. The productive use of data from small earthquakes for seismic hazard assessments relies on knowledge of how earthquake ground motions scale with magnitude. The majority of ground-motion prediction equations (GMPEs) are derived, usually by regression analysis, for the prediction of shaking from earthquakes with Mw>=5 but there is often little consideration given to how they extrapolate to small magnitudes, which are sometimes considered within the hazard integral of probabilistic seismic hazard assessments (PSHAs) or for the testing of GMPEs against observations, especially for regions of low-to-moderate seismicity. These reasons for needing to extrapolate GMPEs pose a significant challenge because the use of GMPEs beyond (or even close to the edges of) the magnitude range for which they were derived can lead to significant under- or over-estimation of ground motions, even if the functional form includes nonlinear magnitude-scaling terms. Here we show that simple stochastic models comprised of a Brune source spectrum and a constant stress (drop) parameter Delta sigma coupled with a site attenuation modeled by k leads to a nonlinear magnitude scaling of peak ground acceleration (PGA) and response pseudo-spectral acceleration (PSA) at 1s that matches the observed dependency over the whole range of magnitudes from Mw 1 to 7. Higher magnitude dependency for models derived using only data from small earthquakes compared to that found using data from large earthquakes is physically-realistic. Assuming a linear magnitude dependence of the logarithm of PGA and PSA is reasonable for ... Conference Object Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Brune ENVELOPE(6.723,6.723,62.526,62.526) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
seismic hazard ground-motion prediction equations ground-motion models stochastic models kappa [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
seismic hazard ground-motion prediction equations ground-motion models stochastic models kappa [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Douglas, John Jousset, Philippe Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
topic_facet |
seismic hazard ground-motion prediction equations ground-motion models stochastic models kappa [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
It is often case that ground-motion records for a given area of interest are available in relative abundance for small (Mw<5) earthquakes but are practically non-existent for larger earthquakes, which have the potential to cause damage to structures. This is a direct consequence of the almost universally observed Gutenberg-Richter relation that a unit increase in magnitude decreases the number of earthquakes observed by a factor of ten. The productive use of data from small earthquakes for seismic hazard assessments relies on knowledge of how earthquake ground motions scale with magnitude. The majority of ground-motion prediction equations (GMPEs) are derived, usually by regression analysis, for the prediction of shaking from earthquakes with Mw>=5 but there is often little consideration given to how they extrapolate to small magnitudes, which are sometimes considered within the hazard integral of probabilistic seismic hazard assessments (PSHAs) or for the testing of GMPEs against observations, especially for regions of low-to-moderate seismicity. These reasons for needing to extrapolate GMPEs pose a significant challenge because the use of GMPEs beyond (or even close to the edges of) the magnitude range for which they were derived can lead to significant under- or over-estimation of ground motions, even if the functional form includes nonlinear magnitude-scaling terms. Here we show that simple stochastic models comprised of a Brune source spectrum and a constant stress (drop) parameter Delta sigma coupled with a site attenuation modeled by k leads to a nonlinear magnitude scaling of peak ground acceleration (PGA) and response pseudo-spectral acceleration (PSA) at 1s that matches the observed dependency over the whole range of magnitudes from Mw 1 to 7. Higher magnitude dependency for models derived using only data from small earthquakes compared to that found using data from large earthquakes is physically-realistic. Assuming a linear magnitude dependence of the logarithm of PGA and PSA is reasonable for ... |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) European Project: 241321,EC:FP7:ENERGY,FP7-ENERGY-2009-1,GEISER(2010) |
format |
Conference Object |
author |
Douglas, John Jousset, Philippe |
author_facet |
Douglas, John Jousset, Philippe |
author_sort |
Douglas, John |
title |
Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
title_short |
Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
title_full |
Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
title_fullStr |
Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
title_full_unstemmed |
Modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
title_sort |
modelling the difference in ground-motion magnitude-scaling in small and large earthquakes |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal-brgm.archives-ouvertes.fr/hal-00581343 |
op_coverage |
Reykjavik, Iceland |
long_lat |
ENVELOPE(6.723,6.723,62.526,62.526) |
geographic |
Brune |
geographic_facet |
Brune |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
2nd International Symposium on Strong-motion Earthquake Effects (ISSEE2011) https://hal-brgm.archives-ouvertes.fr/hal-00581343 2nd International Symposium on Strong-motion Earthquake Effects (ISSEE2011), Apr 2011, Reykjavik, Iceland |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/241321/EU/Geothermal Engineering Integrating Mitigation of Induced Seismicity in Reservoirs/GEISER hal-00581343 https://hal-brgm.archives-ouvertes.fr/hal-00581343 |
_version_ |
1766043333702975488 |