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: The project reassessed over 600 historical events, identifying 177 that caused significant damage (Intensity VI or higher) and removing roughly 260 "fake" or duplicate entries caused by historical recording errors.

: Unlike older records, ECOS provides a uniform estimate of moment magnitude ( MWcap M sub cap W ) for all events, allowing for consistent hazard modeling. Download ECOS pdf

: For year-specific analysis (e.g., the 2002 or 2019/2020 periods), the SED publishes annual summaries available on the ETH Zurich Research Collection . : The project reassessed over 600 historical events,

The SED provides different ways to access this data depending on your needs: The SED provides different ways to access this

: It covers Switzerland and surrounding regions (43–51°N and 3–13°E), merging data from 15 separate national and international catalogues.

The , maintained by the Swiss Seismological Service (SED) , is the authoritative dataset for seismic hazard assessment in the region. The most common downloadable version is ECOS-09 (released in 2011), which provides a comprehensive record of seismic activity from 250 AD through 2008. Key Features of the ECOS PDF & Dataset

: It combines historical macroseismic reports (dating back to 250 AD) with modern instrumental recordings that have been tracked since 1975. How to Access and Download