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Titel |
Moment tensor inversion of the January 8, 2013 (Mw=5.7) and May 24, 2014 (Mw 6.8) North Aegean Earthquakes: seismicity and active tectonics of the North Aegean Region |
VerfasserIn |
Dogan Kalafat, Kıvanç Kekovalı, Ali Pinar |
Konferenz |
EGU General Assembly 2015
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 17 (2015) |
Datensatznummer |
250103323
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Publikation (Nr.) |
EGU/EGU2015-2731.pdf |
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Zusammenfassung |
The North Aegean Sea is one of the most seismically active and deforming region
between the Eurasia and Anatolia tectonic plates. On 8th January 2013 at 14:16 UTC
(16:16 local time) a moderate earthquake (Mw= 5.7) occurred between the south of
Gökçeada and southwest of Bozcaada Islands. The earthquake was felt at a wide area.
Especially felt in the NE Greece south of Lemnos Island and NW Turkey surrounding
areas, such as Çanakkale, Marmara Region and Northern Aegean coast as well as to
Athens. The area is defined as the continuation of the branch of North Anatolian
Fault (NAF) inside the Aegean Sea. Fault plane solution determined by this study
shows that the earthquake occurred on NE-SW oriented strike slip fault segment.
The aftershocks distribution also supported the rupture of the NE-SW oriented
fault.
 Approximately 17 months later, another big earthquake occurred in the same area.ÂOn
24th May 2014, at 09:25 UTC (12:25 local time), a powerful Ml=6.7 (Mw=6.8) earthquake
hit Greece and Turkey, 87 km west of Çanakkale, and totally 350 people injured in Greece
and Turkey. This earthquake has been strongly felt in Greece, Turkey, Bulgaria, Romania.
The main-shock occurred on a fault with a NE-SW strike, where the largest portion of the
energy was released towards these directions. Therefore the earthquake was felt strongly in
Çanakkale, Istanbul and Marmara region. In this study we calculated CMT solutions for
main-shock and important aftershocks (M>4.0). CMT analyses were done for 50 important
earthquakes. Moment tensor solutions show generally strike-slip faulting. The fault which
caused earthquake, is thought to be a branch of North Anatolian Fault Zone in the
North Aegean Sea. Generally, the location of the earthquakes and orientation of the
NE-SW nodal planes are consistent with right-lateral faulting within the North Aegean
Trough (NAT). The Aegean Sea is characterized by dextral strike-slip faulting along
NE-SW striking faults, along fault zones formed parallel to the North Aegean Trough
(NAT). Strike slip faulting is changing to oblique, with significant component of
extension, as one goes from the Aegean to the coastal area of NW and Western
Turkey.
The sources region of the North Aegean earthquakes is influenced by both the
Aegean extensional regime and the strike-slip regime in the western part of the North
Anatolin Fault Zone. Strike-slip faulting is changing to oblique, with significant
component of extension, as one goes from the Aegean to the coastal area of Western
Turkey.
This study was supported by Bogazici University Research Projects Commission under
SRP/BAP project No. 6040 and MarDIM SATREPS project. |
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