• journal_title：Bulletin of the Seismological Society of America
• Contributor：Jochen Braunmiller ; Nicolas Deichmann ; Domenico Giardini ; Stefan Wiemer ; sed Magnitude Working Group
• Publisher：Seismological Society of America
• Date：2005-
• Format：text/html
• Language：en
• Identifier：10.1785/0120030245
• journal_abbrev：Bulletin of the Seismological Society of America
• issn：0037-1106
• volume：95
• issue：1
• firstpage：58
• section：Articles

An earthquake catalog containing a uniform size estimate is important for long-term seismic hazard assessment in regions of low-to-moderate seismicity. During the update of the Earthquake Catalog of Switzerland (<span class="sc">ecosspan>), we performed regression analyses to convert all earthquake size information in <span class="sc">ecosspan> to physically meaningful moment magnitude M<sub>wsub>. For 34 events in and near Switzerland, we determined seismic moment (thus M<sub>wsub>) by regional waveform inversion. Independent M<sub>wsub> estimates for the same events do not exist; however, M<sub>wsub> from European-Mediterranean events, obtained in the same way, agree with M<sub>wsub> from Harvard CMT solutions. All other size estimates, M<sub>Lsub>, M<sub>Dsub>, m<sub>bsub>, M<sub>Ssub>, and intensities, are calibrated relative to these 34 events. Teleseismic M<sub>Ssub> and m<sub>bsub> from international data centers are directly regressed against M<sub>wsub>. Most observations in <span class="sc">ecosspan> consist of local magnitudes (M<sub>Lsub>, M<sub>Dsub>) and intensities. For local magnitudes, we first calibrated the Swiss Seismological Service’s M<sub>Lsub>. Then we calibrated magnitudes from observatories in neighboring countries (France, Germany, Italy) using only events in the border region (e.g., France–Switzerland). Modern instrumental records exist only since the mid-1970s. We calibrated the macroseismic dataset, which represents by far the largest period in the catalog, by determining surface wave magnitude M<sub>Ssub> for stronger twentieth century Swiss earthquakes from analog seismograms. These M<sub>Ssub>, which were converted to M<sub>wsub>, connect intensities and M<sub>wsub>. After calibration, all 20,300 events in <span class="sc">ecosspan> have a unified M<sub>wsub>, including a class-type uncertainty estimate based on the original magnitude scale. <span class="sc">ecosspan> covers the period 250–2001, from 44° N to 51° N and 4° E to 13° E. The largest event in <span class="sc">ecosspan> is the 1356 M<sub>wsub> 6.9 Basle earthquake.