Spatiotemporal evolution of the completeness magnitude of the Icelandic earthquake catalogue from 1991 to 2013 |
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| Authors: | Francesco Panzera Arnaud Mignan Kristin S Vogfjörð |
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| Institution: | 1.Department of Biological, Geological and Environmental Science,University of Catania,Catania,Italy;2.Institute of Geophysics,Swiss Federal Institute of Technology,Zurich,Switzerland;3.Icelandic Meteorological Office,Processing and Research Division,Reykjavík,Iceland |
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| Abstract: | In 1991, a digital seismic monitoring network was installed in Iceland with a digital seismic system and automatic operation. After 20 years of operation, we explore for the first time its nationwide performance by analysing the spatiotemporal variations of the completeness magnitude. We use the Bayesian magnitude of completeness (BMC) method that combines local completeness magnitude observations with prior information based on the density of seismic stations. Additionally, we test the impact of earthquake location uncertainties on the BMC results, by filtering the catalogue using a multivariate analysis that identifies outliers in the hypocentre error distribution. We find that the entire North-to-South active rift zone shows a relatively low magnitude of completeness Mc in the range 0.5–1.0, highlighting the ability of the Icelandic network to detect small earthquakes. This work also demonstrates the influence of earthquake location uncertainties on the spatiotemporal magnitude of completeness analysis. |
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