The 2020 national seismic hazard model for the United Kingdom

Abstract We present updated seismic hazard maps for the United Kingdom (UK) intended use with National Annex revised edition of Eurocode 8. The last national UK were produced by Musson and Sargeant (Eurocode 8 zoning UK. British Geological Survey Report CR/07/125, Kingdom, 2007). model uses an up-to-date earthquake catalogue Isles, which completeness periods have been reassessed, a modified source model. also incorporates some advances in ground motion modelling since 2007, including host-to-target adjustments models selected logic tree. For first time, new are provided not only peak acceleration (PGA) but spectral at 0.2 s (SA 0.2s ) 1.0 5% damping on rock (time-averaged shear wave velocity top 30 m Vs30 ≥ 800 m/s) four return periods, 475 2475 years. most is generally low increases slightly North Wales, England–Wales border region, western Scotland. A similar spatial variation observed PGA SA effects more pronounced . Hazard curves, uniform spectra, disaggregation analysis calculated sites. compared previous 2007 2013 European (Woessner et al. Bull Earthq Eng 13:3553–3596, 2015). There slight increase from to this work; whereas lower than indicated maps.