Spatiotemporal evolution of the completeness magnitude of the Icelandic earthquake catalogue from 1991 to 2013
| Autor: | Francesco Panzera, Arnaud Mignan, Kristín Vogfjörð |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Hydrogeology
Earthquake statistics 010504 meteorology & atmospheric sciences Bayesian probability Magnitude (mathematics) 010502 geochemistry & geophysics Completeness magnitude Spatiotemporal analysis Seismic network 01 natural sciences Geophysics Geochemistry and Petrology Completeness (order theory) Outlier Range (statistics) Structural geology Geology Seismology 0105 earth and related environmental sciences Earthquake location |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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