Name: PGA 1100 (g)
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Description: The 2026 offshore and onshore seismic hazard maps cover the UK, the Channel Islands, and the UK offshore Exclusive Economic Zone EEZ (UK commercial waters). The data comprises a grid of 4663 points that are spaced 0.125° in latitude and 0.25° in longitude, and is developed for an additional ground motion parameter, spectral acceleration at 0.15 s. Therefore, the 2026 hazard maps are for four ground motion parameters, i.e. peak ground acceleration (PGA), spectral acceleration at 0.15 s (SA0.15 s), 0.2 s (SA0.2 s) and 1.0 s (SA1.0 s), for 5% damping and rock conditions and five return periods, i.e. 95, 475, 1100, 2475, and 5000 years. The report of Mosca (2026) describes these updated maps in detail, whereas the technical report by Mosca et al. (2024) provides a detailed description of the methods (see also http://www.earthquakes.bgs.ac.uk/hazard/UKhazard.html). The input data to compute the maps are in in Mosca et al. (2025; DOI: https://doi.org/10.5285/a6babafa-5c82-4e76-aef5-27441104187f). The map for spectral acceleration at 0.15 s has been used to calibrate the seismic design requirements in the second-generation Eurocode 8 to the hazard levels of the UK and will be cited in the British Standards UK National Annex and PD6698. http://data.bgs.ac.uk/id/dataHolding/13608753
Copyright Text: The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
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