Evolution of the dilatation strain in a reference to 2010–2023 Aegean Sea earthquakes
1 RUDN University, Moscow, Russia
2 Dokuz Eylul University, Izmir, Turkey
3 Geophysical Center of the Russian Academy of Sciences, Moscow, Russia
Abstract
The animation shows the behavior of dilation strain in relation to the seismic process in the Aegean region from late 2011 to 2023. For about five years from the start of observations, dilation changes were insignificant. After a pair of strong earthquakes in 2017, extension anomalies formed in the NW and E, presumably related to these events. At the same time, a compression anomaly formed in the SE. By 2020, the western anomaly reached the epicentral zone of one of the strong earthquakes of 2017. The strongest M7 earthquake of 2020 naturally forms a dilation quadrupole, characteristic of the movement of the sides of the general seismic rupture. Seismic ruptures on the surface often create a special dilation pattern – a "butterfly" of two pairs of extension-compression extrema. Observations show that this quadrupole was formed about a year before the strongest earthquake. This trend is consistent with the sinistral type of movement of the territories on both sides of the axial line of the boundary of the Aegean and Anatolian plates. In the north of the region, a compression zone is developing, close to the boundary of the African and Aegean plates. Before the Samos earthquake, the Aegean volcanic arc experienced weak extensions. After the earthquake, significant extension formed in the Santorini volcanic zone. Consideration of the behavior of dilation allows us to note that this characteristic before strong seismic events manifests itself slowly as it approaches the moment of the strongest event. As a result of the occurrence of the strongest earthquake, it demonstrates a typical multipolar pattern.
Coordinate time series of GNSS station with an interval of one day were obtained from the Nevada Geodetic Laboratory website [Blewit et al., 2018].
Database creation date: 2024; Publication date: December 2024
Contributor:
Geophysical Center of the Russian Academy of Sciences, Moscow, Russia
Institution: Geophysical Center of the Russian Academy of Sciences, Moscow, Russia
Publisher: Geophysical Center of the Russian Academy of Sciences (GC RAS), Moscow, Russia (http://www.gcras.ru/eng/)
Data format: .m4v (M4V File Format)
doi: 10.2205/esdb-aegean-dilatation
Citation: Kaftan V. I., Melnikov A. Yu., Dokukin P. A. (2024) Evolution of the dilatation strain in a reference to 2010-2023 Aegean Sea earthquakes. ESDB repository, GCRAS, Moscow, https://doi.org/10.2205/esdb-aegean-dilatation
References:
- Blewitt, G., Hammond, W. C., Kreemer C. Harnessing the GPS data explosion for interdisciplinary science. Eos, 99 (2018) https://doi.org/10.1029/2018EO104623.
License: 
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
URL for downloading: http://esdb.wdcb.ru/doi/2024/esdb-aegean-quake-2010-2023/Evolution_of_the_crustal_dilatation_strain_in_a_reference_to_2010-2023_Aegean_Sea_earthquakes.m4v
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