NDLI: The instability of the M $_{W}$ and M $_{L}$ comparison for earthquakes in Greece for the period 1969 to 2007

Content Provider	Springer Nature Link
Author	Roumelioti, Zafeiria Kiratzi, Anastasia Benetatos, Christoforos
Copyright Year	2009
Abstract	We use 576 earthquakes of magnitude, M $_{w}$, 3.3 to 6.8 that occurred within the region 33° N–42.5° N, 19° E–30° E in the time period 1969 to 2007 to investigate the stability of the relation between moment magnitude, M $_{w}$, and local magnitude, M $_{L}$, for earthquakes in Greece and the surrounding regions. We compare M $_{w}$ to M $_{L}$ as reported in the monthly bulletins of the National Observatory of Athens (NOA) and to M $_{L}$ as reported in the bulletins of the Seismological Station of the Aristotle University of Thessaloniki. All earthquakes have been analyzed through regional or teleseismic waveform inversion, to obtain M $_{w}$, and have measured maximum trace amplitudes on the Wood–Anderson seismograph in Athens, which has been in operation since 1964. We show that the Athens Wood–Anderson seismograph performance has changed through time, affecting the computed by NOA M $_{L}$ by at least 0.1 magnitude units. Specifically, since the beginning of 1996, its east–west component has been recording systematically much larger amplitudes compared to the north–south component. From the comparison between M $_{w}$ and M $_{L}$ reported by Thessaloniki, we also show that the performance of the sensors has changed several times through time, affecting the calculated M $_{L}$’s. We propose scaling relations to convert the M $_{L}$ values reported from the two centers to M $_{w}$. The procedures followed here can be applied to other regions as well to examine the stability of magnitude calculations through time.
Starting Page	309
Ending Page	337
Page Count	29
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	14
Issue Number	2
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-05-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnitude Local magnitude Moment magnitude Aegean Earthquake Geotechnical Engineering Hydrogeology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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