High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece)
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....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-02-01
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| Series: | Solid Earth |
| Online Access: | http://www.solid-earth.net/6/173/2015/se-6-173-2015.pdf |
| _version_ | 1818035999074156544 |
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| author | V. K. Karastathis E. Mouzakiotis A. Ganas G. A. Papadopoulos |
| author_facet | V. K. Karastathis E. Mouzakiotis A. Ganas G. A. Papadopoulos |
| author_sort | V. K. Karastathis |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T07:03:58Z |
| format | Article |
| id | doaj.art-bd061e1845e444fe81d1b1378bbacc40 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-10T07:03:58Z |
| publishDate | 2015-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-bd061e1845e444fe81d1b1378bbacc402022-12-22T01:58:15ZengCopernicus PublicationsSolid Earth1869-95101869-95292015-02-016117318410.5194/se-6-173-2015High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece)V. K. Karastathis0E. Mouzakiotis1A. Ganas2G. A. Papadopoulos3National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, P.O. Box 20048, 11810 Athens, GreeceNational Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, P.O. Box 20048, 11810 Athens, GreeceNational Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, P.O. Box 20048, 11810 Athens, GreeceNational Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, P.O. Box 20048, 11810 Athens, GreeceDetailed 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.http://www.solid-earth.net/6/173/2015/se-6-173-2015.pdf |
| spellingShingle | V. K. Karastathis E. Mouzakiotis A. Ganas G. A. Papadopoulos High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) Solid Earth |
| title | High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| title_full | High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| title_fullStr | High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| title_full_unstemmed | High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| title_short | High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece) |
| title_sort | high precision relocation of seismic sequences above a dipping moho the case of the january february 2014 seismic sequence on cephalonia island greece |
| url | http://www.solid-earth.net/6/173/2015/se-6-173-2015.pdf |
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