A harmonised instrumental earthquake catalogue for Iceland and the northern Mid-Atlantic Ridge

Abstract. A comprehensive catalogue of historical earthquakes, with accurate epicentres and harmonised magnitudes is a crucial resource for seismic hazard mapping. Here we update combine catalogues from several sources to compile earthquakes in near Iceland, the years 1900–2019. In particular are based on local information, whereas teleseismic observations, primarily international online catalogues. The most reliable epicentre information comes Icelandic Meteorological Office, but this complemented technical reports, scientific publications, newspaper articles. contains 1281 moment magnitude (Mw) ?4 events, estimated completeness Mw 5.5 first years, going down 4.5 recent years. largest 7.0. Such merging data has not been done before result an earthquake map much more locations than earlier maps. also lists 5640 additional Mid-Atlantic Ridge, north 43?, both determined teleseismically. When available, proxy values computed using ?2 regression, normally surface-wave exceptionally body-wave magnitude. Magnitudes Mw?4.5 have associated uncertainty estimates. actual combined released found be consistent simple plate motion model, indicating that activity period might typical any 120-year time span. named ICEL-NMAR, it available at http://data.mendeley.com (last access: 19 July 2021).