Fault modelling, seismic sequence evolution and stress transfer scenarios for the July 20, 2017 (MW 6.6) Kos–Gökova Gulf earthquake, SE Aegean

Sboras, Sotiris; Lazos, Ilias; Mouzakiotis, E.; Karastathis, V.; Pavlides, Spyros; Chatzipetros, Alexandros

doi:10.1007/s11600-020-00471-8

Cited by 12 publications

(6 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This indicates that the active structures in the eastern and northeastern Aegean accommodate significant strain and are associated with elevated earthquake hazard. This increased strain accumulation was notoriously expressed the previous years by the occurrence of the 2017 M w 6.3 Lesvos and M w 6.6 Kos earthquakes (e.g., Kiratzi, 2018; Konca et al., 2019; Sboras et al., 2020) and the 2020 M w 7.0 Samos earthquake (e.g., Chousianitis & Konca, 2021; Hu et al., 2022; Sboras et al., 2021).…”

Section: Quantification Of Geodetic Deformation Ratesmentioning

confidence: 98%

The Upper Crustal Deformation Field of Greece Inferred From GPS Data and Its Correlation With Earthquake Occurrence

Chousianitis,

Sboras,

Mouslopoulou

et al. 2024

JGR Solid Earth

View full text Add to dashboard Cite

We present a new geodetic strain rate and rotation rate model for Greece that has been derived using a highly dense GPS velocity field. The spatial distribution and the resolved rates of the various velocity gradient tensor quantities provided updated constraints on the present‐day upper crustal deformation in the region and revealed new details not reported previously. The spatial distribution of the second invariant demonstrated that the overall magnitude of strain rates is highest across two well‐defined provinces. The first follows the North Anatolian Fault and its two branches within the north Aegean, crosses central Greece and through the Gulf of Corinth it terminates in western Greece, while the second encompasses the extensional province of western Turkey and the eastern Aegean Sea islands. Our estimates revealed that shearing affects some of the fault‐bounded grabens of central Greece that lie to the SW of the North Aegean Basin implying considerable oblique extension. We identified a narrow region of counterclockwise rotation whose location and kinematics have been induced by the net effect across the intersection of the clockwise rotating domains of western and central Greece. The Aegean microplate and the Anatolian plate are separated by a wide transition zone which accommodates the curved stretching of the entire plate system. In both edges of the Hellenic forearc the dominant mode of crustal strain is E‐W extension. We found that earthquakes of M ≥ 5.6 are spatially well‐correlated with high‐strain areas, indicating that strain rate mapping could be used to inform future probabilistic seismic hazard analyses.

show abstract

Section: Quantification Of Geodetic Deformation Ratesmentioning

confidence: 98%

The Upper Crustal Deformation Field of Greece Inferred From GPS Data and Its Correlation With Earthquake Occurrence

Chousianitis,

Sboras,

Mouslopoulou

et al. 2024

JGR Solid Earth

View full text Add to dashboard Cite

show abstract

“…The recent earthquake's proximity to, sometimes densely, inhabited areas, like the 2017 Kos-Bodrum M w 6.4 earthquake, occurred offshore between the Kos Island in Greece and Bodrum town on the Turkish coast (e.g., Karasözen et al, 2018;Sboras et al, 2020), the 2020 Samos M w 7.0 earthquake, occurred again offshore and caused extensive damage in İzmir (e.g., Akinci et al, 2021;Sboras et al, this volume), and the 2021, Tyrnavos-Elassona M w 6.3 earthquake, just 15 km away from Larissa with major impact in local villages, are extremely valuable for the seismic hazard community. All these recently emerging data can be a crucial input in active fault databases aiming at contributing to the SHA, to simulate the ground motions and consequently enhance the building codes.…”

Section: Other 'Surprising' Earthquakes In Mainland Greecementioning

confidence: 99%

Recent earthquake activity of March 2021 in northern Thessaly unlocks new scepticism on Faults

Pavlides¹

2021

Turkish J Earth Sci

View full text Add to dashboard Cite

This short opinion article presents and highlights new and old problems related to active geological faults, as seismic sources, after the experience of the last March 3 and 4, 2021 (M w 6.3 and M w 6.0, respectively) Tyrnavos-Elassona earthquakes in northern Thessaly, Greece. Although the active faults in the area are very well studied, demonstrating typical geomorphic features that intensely affect the morphological relief, it seems that the earthquakes were produced by unknown faults emerging in the mountainous area (alpine basement). Primary (?) coseismic ruptures, however, were also observed northwards along the Titarissios valley. A geological interpretation of the faulting mechanism is also proposed. The existence of a new unknown source in an intermontane area is problematic. The role of inherited alpine structures seems more important today than in the past. The strike of the two new seismogenic sources, responsible for the two strongest events of the 2021 earthquake succession, differs from the previously known active faults. This forces us to reconsider older views on the direction of development of active faults and the orientation of the stress field. Concerns are being raised about how new structures can be detected and their role in seismic hazard assessment, especially when located near or within the urban fabric, in cities that are now constantly expanding and being established in new, often loose soils.

show abstract

“…As mentioned at the beginning of this section, the main objective of this research is to model the current velocity field of Ecuador by analyzing the GNSS time series after the most important seismic event of the last 20 years in Ecuador. Considering that a strong earthquake could give important seismic displacements in areas closer to the epicenter [ 8 ], we can say that there is an important variation of velocities in the crust. Due to the aforementioned, this research becomes the first modeling of the velocity field of Ecuador after the change in the geodesic reference frame of the country—we started from the selection of the most stable GNSS permanent stations on the territory; then, time series were obtained with subsequent data from the said earthquake to calculate the velocities.…”

Section: Introductionmentioning

confidence: 99%

Present-Day Crustal Velocity Field in Ecuador from cGPS Position Time Series

Arias-Gallegos

Borque-Arancón

Gil

2023

Sensors

View full text Add to dashboard Cite

The present study analyzes the GNSS time series obtained between the years 2017 and 2022 for the calculation of absolute and residual rates of Ecuador in 10 stations (ABEC, CUEC, ECEC, EPEC, FOEC, GZEC, MUEC, PLEC, RIOP, SEEC, TPC) of the continuous monitoring REGME network. Considering that the latest studies refer to periods 2012–2014 and Ecuador is located in an area of high seismic activity, it is important to update the GNSS rates. The RINEX data were provided by the Military Geographic Institute of Ecuador, the governing institution of geoinformation in that country; for processing, GipsyX scientific software was used with a PPP mode, considering 24 h sessions, and high precision was achieved. For the analysis of time series, the SARI platform was used. The series was modeled using a least-squares adjustment, which delivered the velocities for each station in the three local topocentric components. The results were contrasted with other studies, obtaining interesting conclusions as the presence of abnormal post-seismic rates stands out due to the high rate of seismic occurrence in Ecuador, and reaffirms the idea of a constant update of velocities for the Ecuadorian territory and the inclusion of the stochastic factor in the analysis of GNSS time series, since it can affect the ability to obtain the final GNSS velocities.

show abstract

Fault modelling, seismic sequence evolution and stress transfer scenarios for the July 20, 2017 (MW 6.6) Kos–Gökova Gulf earthquake, SE Aegean

Cited by 12 publications

References 56 publications

The Upper Crustal Deformation Field of Greece Inferred From GPS Data and Its Correlation With Earthquake Occurrence

The Upper Crustal Deformation Field of Greece Inferred From GPS Data and Its Correlation With Earthquake Occurrence

Recent earthquake activity of March 2021 in northern Thessaly unlocks new scepticism on Faults

Present-Day Crustal Velocity Field in Ecuador from cGPS Position Time Series

Contact Info

Product

Resources

About