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| Titel |
High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| VerfasserIn |
V. K. Karastathis, E. Mouzakiotis, A. Ganas, G. A. Papadopoulos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-02-12), S.173-184 |
| Datensatznummer |
250115394
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| Publikation (Nr.) |
 copernicus.org/se-6-173-2015.pdf |
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| Zusammenfassung |
| Detailed velocity structure and Moho mapping is of crucial importance for a
high precision relocation of seismicity occurring out of, or marginal to,
the geometry of seismological networks. Usually the seismographic networks do
not cover the boundaries of converging plates such as the Hellenic arc. The
crustal thinning from the plate boundary towards the back-arc area creates
significant errors in accurately locating the earthquake, especially when
distant seismic phases are included in the analysis. The case of the
Cephalonia (Ionian Sea, Greece) sequence of January–February 2014 provided
an excellent example where the hypocentral precision was greatly affected by
the crustal thinning from the plate boundary at the Ionian sea towards the
Aegean sea. This effect was examined in detail by testing various velocity
models of the region in order to determine an optimal model. Our tests
resulted in the adoption of a velocity model that resembles the crustal
thinning of the region. Then, a relocation procedure was performed in the
Cephalonia sequence for the time period of 26 January to 15 May 2014 by
applying probabilistic non-linear location algorithms. The high-precision
relocation resulted in an improved spatial distribution of the seismicity
with respect to the preliminary locations and provided a reliable basis to
examine seismotectonic implications of the Cephalonia sequence. |
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