Abstract
Probabilistic seismic hazard assessments are the basis of modern seismic design codes. To test fully a seismic hazard curve at the return periods of interest for engineering would require many thousands of years’ worth of ground-motion recordings. Because strong-motion networks are often only a few decades old (e.g. in mainland France the first accelerometric network dates from the mid-1990s), data from such sensors can be used to test hazard estimates only at very short return periods. In this article, several hundreds of years of macroseismic intensity observations for mainland France are interpolated using a robust kriging-with-a-trend technique to establish the earthquake history of every French mainland municipality. At 24 selected cities representative of the French seismic context, the number of exceedances of intensities IV, V and VI is determined over time windows considered complete. After converting these intensities to peak ground accelerations using the global conversion equation of Caprio et al. (Ground motion to intensity conversion equations (GMICEs): a global relationship and evaluation of regional dependency, Bulletin of the Seismological Society of America 105:1476–1490, 2015), these exceedances are compared with those predicted by the European Seismic Hazard Model 2013 (ESHM13). In half of the cities, the number of observed exceedances for low intensities (IV and V) is within the range of predictions of ESHM13. In the other half of the cities, the number of observed exceedances is higher than the predictions of ESHM13. For intensity VI, the match is closer, but the comparison is less meaningful due to a scarcity of data. According to this study, the ESHM13 underestimates hazard in roughly half of France, even when taking into account the uncertainty in the conversion from intensity to acceleration. However, these results are valid only for the acceleration range tested in this study (0.01 to 0.09 g).
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Acknowledgements
We thank Daniel Monfort-Climent, Philippe Daniels, Sindy Raout, Samuel Auclair, Pierre Gehl and, particularly, Jérôme Lambert for their contributions to the project on the creation of the database of interpolated intensities, which was funded by the French Ministry of the Environment. Early versions of this study were presented at the 35th General Assembly of the European Seismological Commission, the 9th National Colloquium of the French Association of Earthquake Engineering (AFPS2015) and the 4th International Colloquium on Historical Earthquakes and Macroseismology. We thank those people who commented on these presentations. Finally, we thank two anonymous reviewers for their comments on the first version of this article.
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Rey, J., Beauval, C. & Douglas, J. Do French macroseismic intensity observations agree with expectations from the European Seismic Hazard Model 2013?. J Seismol 22, 589–604 (2018). https://doi.org/10.1007/s10950-017-9724-7
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DOI: https://doi.org/10.1007/s10950-017-9724-7