Project Name

Global Seismic Hazard Map

Openly accessible global datasets and plots for peak ground acceleration with a return period of 475 years on rock

Description

The Global Earthquake Model (GEM) Global Seismic Hazard Map (version 2023.1) depicts the geographic distribution of the Peak Ground Acceleration (PGA) with a 10% probability of being exceeded in 50 years, computed for reference rock conditions (shear wave velocity, Vs30, of 760-800 m/s).

The map was created by collating maps computed using national and regional probabilistic seismic hazard models developed by various institutions and projects, in collaboration with GEM Foundation scientists. This version represents an update from the previous release from 2018 and features improvements in most regions of the world, as well as a higher spatial definition (approx. 2.5X) compared to the previous version.

For the first time, it is now openly available in raster format as a direct download under a CC BY-NC-SA 4.0 license. An interactive online viewer (CC BY-NC-SA 4.0) is available, as well as a PDF poster and a high-resolution PNG (CC BY-SA 4.0) through the links on this page.

A set of comprehensive maps is also available that features up to 20 layers with global coverage, considering PGA and spectral acceleration (SA) for four periods of vibration (0.2s, 0.3s, 0.6s and 1.0s), calculated for reference rock and spatially variable soil conditions, for 2% and 10% probability of exceedance in 50 years. By clicking the "License Request" button, the full set or individual layers can be requested freely for research and public-good applications, or for a licensing fee in the case of commercial applications.

How to cite this work

K. Johnson, M. Villani, K. Bayliss, C. Brooks, S. Chandrasekhar, T. Chartier, Y. Chen, J. Garcia-Pelaez, R. Gee, R. Styron, A. Rood, M. Simionato, M. Pagani (2023). Global Earthquake Model (GEM) Seismic Hazard Map (version 2023.1 - June 2023), DOI: https://doi.org/10.5281/zenodo.8409647

Available Versions

The base layer of PGA on rock for 10% exceedance in 50 years is available for direct download as a raster file, under a CC BY-SA-NC 4.0 license. Users interested in this version can click the "Open Version Download" button in the right panel to access the information. A PDF poster, as well as a high-resolution PNG, is available for direct download under a CC BY-SA 4.0 license. If your use case does not meet the open license requirement, or if you are interested in obtaining the full set of layers, please submit a request in our system by clicking on the "License Request", where a specific license will be provided, depending on the use case. Additionally, users interested in the previous version of the Global Map (v2018) can access the previous poster on this link.

License information

This product is available under multiple Creative Commons licenses (depending on the format), which may require some of the following: *Attribution (you must give appropriate credit, provide a link to the license, and indicate if changes were made) *Non-commercial (you may not use the material for commercial purposes) *ShareAlike (derivatives created must be made available under the same license as the original) Any deviation from these terms incur in license infringement. For commercial use of the dataset, a specific license agreement must be made tailored to your use case, in such instance please click on "License Request".