Projects per year
Abstract
Seismic hazard varies greatly during an earthquake sequence. Understanding this variation can be useful to end-users, such as emergency managers, as it would enable them to make more informed decisions about potential risk reduction measures. This article presents examples of how two commonly-used products of probabilistic seismic hazard assessments: uniform hazard spectra and disaggregated earthquake scenarios, vary during two severe seismic sequences in western Greece. These calculations are made using a recent time-dependent seismic hazard model based on a Bayesian ETAS approach. The examples show that time-dependent uniform hazard spectra for short return periods (1 and 10 years) are significantly higher than standard time-independent spectra but that uniform hazard spectra for the commonly-used return periods of 475 and 2475 years are similar to those from time-independent assessments. The time-dependent spectra generally converge within a couple of days to the time-independent spectra. The examples also show that the dominant earthquake scenarios evidenced by the disaggregation for the time-dependent assessment can show significant differences from the time-independent scenarios. This is particularly true when the earthquake sequence is distant from the location of interest as the aftershocks contribute greatly to the overall hazard. To show these changes more clearly this article introduces a new graphical representation of the disaggregated results: contour maps showing the magnitude or distance of the dominant earthquake scenario with axes of the structural period and response spectral acceleration.
Original language | English |
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Pages (from-to) | 77-94 |
Journal | Bulletin of Earthquake Engineering |
Volume | 21 |
Early online date | 25 Oct 2022 |
DOIs | |
Publication status | Published - Jan 2023 |
Keywords
- time-dependent PSHA
- disaggregation
- UHS
- seismic sequence
- dominant earthquake scenario
- Greece
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Dive into the research topics of 'Variations in uniform hazard spectra and disaggregated scenarios during earthquake sequences'. Together they form a unique fingerprint.Projects
- 1 Finished
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Towards more Earthquake-resilient Urban Societies through a Multi-sensor-based Information System enabling Earthquake Forecasting, Early Warning and Rapid Response Systems (TURNKEY)
Douglas, J. (Principal Investigator), Perry, M. (Co-investigator), Roberts, J. (Co-investigator), Tubaldi, E. (Co-investigator) & Zonta, D. (Co-investigator)
European Commission - Horizon Europe + H2020
1/06/19 → 31/05/22
Project: Research
Research output
- 1 Citations
- 1 Article
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Variations in hazard during earthquake sequences between 1995 and 2018 in western Greece as evaluated by a Bayesian ETAS model
Azarbakht, A., Ebrahimian, H., Jalayer, F. & Douglas, J., 1 Oct 2022, In: Geophysical Journal International. 231, 1, p. 27-46 20 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile4 Citations (Scopus)37 Downloads (Pure)