NDLI: Problematic non-double-couple mechanism of the 2002 Amfilochia M$

Content Provider	Springer Nature Link
Author	Adamova, Petra Sokos, Efthimios Zahradnik, Jiri
Copyright Year	2008
Abstract	Two seismic agencies reported a very low double-couple percentage (DC%) of the Amfilochia earthquake, of about 30% and 60%, by Schweizerischer Erdbebendienst and Mediterranean Very Broadband Seismographic Network, respectively. Near-regional waveforms, carefully analyzed in this paper for the DC%, suggested a higher DC%, ranging from 75 to 100, dependent on the uncertainty of the source position (optimum value DC% = 93). Using a statistical F test, forward modeling of the near-regional data with a single-event low-DC% source yields a significantly worse waveform match. The fit of near-regional data can be further improved (although at the 90% significance level only) when considering a speculative two-event model. The same model, when viewed at the very-low frequency range, reaches the very low DC% values. However, two features make the two-event model unlikely: The two subevents strongly differ in their focal mechanism, and their mutual separation (3.5 s) is larger than the expected duration of this earthquake. Therefore, the two-source model appears to be nothing but an interesting equivalent representation of the non-DC model, providing some insight into the possible origin of the apparently low DC%. Preference is given to the simple interpretation, most clearly supported by the near-regional data, that the Amfilochia earthquake was an almost pure-shear event.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	13
Issue Number	1
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-06-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Moment tensor Iterative deconvolution Regional data Waveform inversion Deviatoric solution Source complexity Focal mechanism Geotechnical Engineering Hydrogeology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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