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| Titel |
Multiscale mapping of completeness magnitude of earthquake catalogs |
| VerfasserIn |
Inessa Vorobieva, Clement Narteau, Peter Shebalin, François Beauducel, Alexandre Nercessian, Valérie Clouard, Marie-Paule Bouin |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077560
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| Zusammenfassung |
| We propose a multiscale method to map spatial variations in completeness magnitude Mc of
earthquake catalogs. The Mc value may significantly vary in space due to the change of the
seismic network density. Here we suggest a way to use only earthquake catalogs to separate
small areas of higher network density (lower Mc) and larger areas of smaller network density
(higher Mc). We reduce the analysis of the FMDs to the limited magnitude ranges, thus
allowing deviation of the FMD from the log-linearity outside the range. We associate ranges
of larger magnitudes with increasing areas for data selection based on constant
in average number of completely recorded earthquakes. Then, for each point in
space, we document the earthquake frequency-magnitude distribution at all length
scales within the corresponding earthquake magnitude ranges. High resolution of the
Mc-value is achieved through the determination of the smallest space-magnitude scale
in which the Gutenberg-Richter law (i. e. an exponential decay) is verified. The
multiscale procedure isolates the magnitude range that meets the best local seismicity
and local record capacity. Using artificial catalogs and earthquake catalogs of the
Lesser Antilles arc, this Mc mapping method is shown to be efficient in regions with
mixed types of seismicity, a variable density of epicenters and various levels of
registration. |
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