Geodetic evidence for post-seismic deformations following the 2014 North Aegean Mw 6.9 earthquake
Abstract
The 2014 North Aegean Sea earthquake was a strong (Mw 6.9) event that caused significant crustal deformations. In the present study we investigate the long-term impact of the earthquake on the kinematics of the North Aegean Trough (NAT). For this purpose, we analyzed GPS observations collected from May 2010 to April 2022 at five permanent GPS reference stations. Two of these stations are located close to the epicenter(s) on the Islands of Lemnos and Samothrace. We processed the data using the Precise Point Positioning (PPP) technique. The analysis of the obtained coordinate time-series revealed a post-seismic deformation (PSD) period lasting for more than two years leading to cumulative 2D post-seismic displacement of 22 mm and 27 mm for Samothrace and Lemnos, respectively. The magnitudes of these post-seismic slip vectors correspond to 23% and 49% of the co-seismic vectors at Samothrace and Lemnos, respectively. The long-term analysis showed that after the end of the PSD period the stations are characterized by stable velocities that are noticeably different compared to the velocities prior to the event. We observed a change in the velocity in the order of 2 mm/yr for both Samothrace and Lemnos. It is the first time that PSD and velocity changes have been reported for the 2014 North Aegean Sea earthquake shedding light on the characteristics and the impact of this important earthquake on the kinematics of NAT.
Keyword : North Aegean Trough, earthquake, post-seismic deformation, velocity change, GPS, Precise Point Positioning
How to Cite
Gianniou, M., Argyrakis, P., & Prasinou, T. (2023). Geodetic evidence for post-seismic deformations following the 2014 North Aegean Mw 6.9 earthquake. Geodesy and Cartography, 49(4), 195–208. https://doi.org/10.3846/gac.2023.19369
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
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Golriz, D., Bock, Y., & Xu, X. (2021). Defining the coseismic phase of the crustal deformation cycle with seismogeodesy. Journal of Geophysical Research: Solid Earth, 126(10), e2021JB022002. https://doi.org/10.1029/2021JB022002
Görgün, E., & Görgün, B. (2015). Seismicity of the 24 May 2014 Mw 7.0 Aegean Sea earthquake sequence along the North Aegean Trough. Journal of Asian Earth Sciences, 111, 459–469. https://doi.org/10.1016/j.jseaes.2015.06.018
He, X., Montillet, J. P., Fernandes, R., Bos, M., Yu, K., Hua, X., & Jiang, W. (2017). Review of current GPS methodologies for producing accurate time series and their error sources. Journal of Geodynamics, 106, 12–29. https://doi.org/10.1016/j.jog.2017.01.004
Héroux, P., & Kouba, J. (2001). GPS precise point positioning using IGS orbit products. Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 26(6–8), 573–578. https://doi.org/10.1016/S1464-1895(01)00103-X
Kenyeres, A., & Bruyninx, C. (2004). EPN coordinate time series monitoring for reference frame maintenance. GPS Solutions, 8, 200–209. https://doi.org/10.1007/s10291-004-0104-8
Kiratzi, A. (2002). Stress tensor inversions along the westernmost North Anatolian Fault Zone and its continuation into the North Aegean Sea. Geophysical Journal International, 151(2), 360–376. https://doi.org/10.1046/j.1365-246X.2002.01753.x
Konstantinou, K. I. (2017). Accurate relocation of seismicity along the North Aegean Trough and its relation to active tectonics. Tectonophysics, 717, 372–382. https://doi.org/10.1016/j.tecto.2017.08.021
Kreemer, C., Blewitt, G., & Maerten, F. (2006). Co‐and postseismic deformation of the 28 March 2005 Nias Mw 8.7 earthquake from continuous GPS data. Geophysical Research Letters, 33(7), L07307. https://doi.org/10.1029/2005GL025566
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Pavlides, S. B., & Tranos, M. D. (1991). Structural characteristics of two strong earthquakes in the North Aegean: Ierissos (1932) and Agios Efstratios (1968). Journal of Structural Geology, 13(2), 205–214. https://doi.org/10.1016/0191-8141(91)90067-S
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