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Indicator natural hazards

Local information about seismic hazard

The intensity and duration of earthquake vibrations in a location depend to a great extent on the characteristics of the local subsoil. To determine the local seismic hazard, the cantons produce maps of the subsoil classes and spectral microzoning, on their own initiative and with the technical support of the Confederation. These documents are used by construction experts, for example, to facilitate the design of more earthquake-proof buildings and to test the earthquake-resistance of existing buildings.

Assessment of the state
medium medium
Assessment of the trend
positive positive
With maps of the subsoil classes and/or spectral microzoning studies 2024: 18 With maps of the subsoil classes and/or spectral microzoning studies 2023: 18 With maps of the subsoil classes and/or spectral microzoning studies 2022: 18 With maps of the subsoil classes and/or spectral microzoning studies 2021: 18 With maps of the subsoil classes and/or spectral microzoning studies 2020: 18 With maps of the subsoil classes and/or spectral microzoning studies 2019: 18 With maps of the subsoil classes and/or spectral microzoning studies 2018: 18 With maps of the subsoil classes and/or spectral microzoning studies 2017: 17 With maps of the subsoil classes and/or spectral microzoning studies 2016: 17 With maps of the subsoil classes and/or spectral microzoning studies 2015: 17 With maps of the subsoil classes and/or spectral microzoning studies 2014: 17 With maps of the subsoil classes and/or spectral microzoning studies 2013: 17 With maps of the subsoil classes and/or spectral microzoning studies 2012: 17 With maps of the subsoil classes and/or spectral microzoning studies 2011: 16 With maps of the subsoil classes and/or spectral microzoning studies 2010: 15 With maps of the subsoil classes and/or spectral microzoning studies 2009: 13 With maps of the subsoil classes and/or spectral microzoning studies 2008: 11 With maps of the subsoil classes and/or spectral microzoning studies 2007: 2 With maps of the subsoil classes and/or spectral microzoning studies 2006: 2 With maps of the subsoil classes and/or spectral microzoning studies 2005: 2 With maps of the subsoil classes and/or spectral microzoning studies 2004: 2
Data for the graph: Excel
Source: FOEN
Comment

The aim is to ensure that all cantons have access to local information about seismic hazard. To date, 70% of the cantons have produced maps of seismic subsoil classes and seismic microzoning studies. In the cantons AI, BE, SG, SZ, TG, ZG, UR and ZH such bases do not exist. For this reason, the status is assessed as medium. A positive development can be observed from 2004 to 2018. From 2018 onwards, the development remained stable, as only new canton has become active since then. Furthermore, there is a need to update outdated existing maps of subsoil classes in 13 cantons, out of 17 cantons that have such maps..

International comparison

Compared to other European countries, the production of maps with seismic subsoil classes is very advanced in Switzerland.

Method

The data are collected by means of a survey of cantonal projects. The FOEN centralises the data using the web application Map.geo.admin.

Basis for assessment of the trend
Targeted trend Initial value Final value Variation in % Observed trend Assessment
Growth Average 2004-2006 Average 2022-2024 800.00% Growth positive
 
Last updated on: 06.05.2025

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