AHEAD European Archive of Historical EArthquake DataEuropean Archive of Historical EArthquake Data

Elenco studiData sources
Elenco terremotiEarthquakes

Gisler et al., 2004b

Gisler M., Fäh D., Schibler R., 2004b. Revising macroseismic data in Switzerland: The December 20, 1720 earthquake in the region of Lake Constance. Journal of Seismology, 8, 2, 179-192. https://doi.org/10.1023/B:JOSE.0000021392.95950.a0

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Upgrading the Earthquake Catalog of Switzerland (ECOS) included revising the earthquake of 1720. This change has major importance for history and seismology.Although that quake has been the subject of several publications, none was based on critical methods. This re-evaluation of the event is built upon a new and more reliable database established after investigating archives and libraries. Using data from such historical sources, we assigned new site intensities, adopting the criteria established by the European macroseismic scale EMS 98 (Grünthal, 1998).We discovered that the event had been assigned an overestimated intensity, due to interpretation errors in former earthquake catalogs and compilations. We recommend reducing the intensity from I0= VIII to I0= VI (EMS 98). The moment magnitude is given as MW= 4.6. Since the event had been considered the largest for its respective area, downgrading it now will influence the seismic hazard assessment for this region.

Nell'archivio c'è un terremoto da questo studio:In the archive there is one earthquake considered from this study:

molto grandiextra large
molto piccolivery small
non parametrizzatinot determined

Clicca sulla riga per individuare il terremoto sulla mappa o sulla lente per ottenere più informazioni.Click the row to highlight the earthquake on the map or the lens to obtain more information.

  DataDate    Area epicentraleEpicentral area    MDPs   Imax  EQ in
EQ in
Riferim. in
1720 12 20 04 30Arbon/SG  18  D