%0 Conference Proceedings %T A strategy to build a unified data set of moment magnitude (Mw) estimates for low-to-moderate seismicity regions based on European–Mediterranean data: application to metropolitan France %+ Bureau d'évaluation des risques sismiques pour la sûreté des installations (IRSN/PSE-ENV/SCAN/BERSSIN) %A Laurendeau, Aurore %A Scotti, Oona %A Clément, Christophe %Z IRSN %< avec comité de lecture %( Seismological Research Letters %B 2022 Annual Meeting SSA Technical Sessions %C Bellevue (USA), United States %Y Seismological Society of America %V 93 %N 2B %P 1328 %8 2022-04-19 %D 2022 %R 10.1785/0220220087 %Z Sciences of the Universe [physics]Conference papers %X The moment magnitude (Mw) scale is largely used in seismic hazard assessment to characterize earthquake events both in the earthquake cataloguesand in the ground motion databases. Several Mw values can be publishedby different authors for the same event due to the use of different computation methods, input data, or seismic networks. In this study, we developed anovel strategy to assign a unique and unified Mw value to each event. This hybrid strategy is based on (i) ranking Mw sources in five levels from globalto specific studies, (ii) inter-comparisons of Mw estimates at the EuropeanMediterranean scale with a reference dataset, consisting of Mw values givenby the global and European centroid moment tensor services and (iii) usinga Mw value threshold that are useful for low-to moderate seismicity regionssuch as metropolitan France, the target region ofour study. For the EuropeanMediterranean region, we collected from 34 sources (bulletins, publications,...) 6752 Mw estimates of 4454 shallow events that occurred between 1963and 2019. A unified Mw value could be attributed to 3351 events and to 185events in the case ofthe France region. Comparison of this new unified Mwdataset shows good agreement with the Italian CPTI15 catalogue over the4.0