The Samothrace Earthquake of May 2014 and the Displacements Estimations Using Permanent GPS Stations Data

Bitharis, Stylianos; Fotiou, A.; Pikridas, Christos; Rossikopoulos, Dimitrios; Pavlides, Spyros; Chatzipetros, Alexandros

doi:10.12681/bgsg.11867

Cited by 3 publications

(4 citation statements)

References 6 publications

(6 reference statements)

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“…The analysis of the GPS data from the stations in the North Aegean Sea revealed that the 2014 NAT earthquake was associated by post-seismic motion. A first evidence of this post-seismic motion was given in previous studies which analyzed seven days of data after the earthquake and reported that the deformation evolved for two days after the event (Sboras et al, 2015;Bitharis et al, 2016). In this study we revealed a detailed pattern of the postseismic deformation by analyzing data up to eight years after the earthquake.…”

Section: Discussionsupporting

confidence: 53%

“…Saltogianni et al (2016) investigated the dynamic displacements of GPS stations during the event by analyzing 1 Hz GPS data and found a correlation between the kinematic and the static displacements. Sboras et al (2015) and Bitharis et al (2016) studied the time-series of the GPS station in Samothrace and concluded that the displacement was not instantaneous during the earthquake, but it was stabilized after approximately two days. Tiryakioglu et al (2017) estimated inter-seismic velocities for 12 GPS stations on either side of NAF in Turkey using a period of about 6 years before the 2014 earthquake.…”

Section: Introductionmentioning

confidence: 99%

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Geodetic Evidence for Post-Seismic Deformations Following the 2014 North Aegean Mw 6.9 Earthquake

Gianniou,

Argyrakis,

Prasinou

2023

Geodesy and Cartography

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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.

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Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Geodetic Evidence for Post-Seismic Deformations Following the 2014 North Aegean Mw 6.9 Earthquake

Gianniou,

Argyrakis,

Prasinou

2023

Geodesy and Cartography

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“…Closest to epicentre is 018B GNSS station which located on the island of Samothrace and only 16 Km away. In order to evaluate the overall precision of PPP and consequently the site displacements, the daily solutions and not the epoch kinematic of every 5 minutes, were compared with those derived from network adjustment using the GAMIT software (Sboras et al, 2015;Bitharis et al, 2016). Coordinate comparisons of 018B station (epicentre) are illustrated in figures 3a and 3b for North, East and Up component respectively.…”

Section: The Applied Ppp Methods For Seismic Displacements Estimationmentioning

confidence: 99%

Monitoring Seismic Displacements Using GNSS Data With PPP Method

et al. 2017

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The Precise Point Positioning (PPP) analysis method adapted for monitoring coordinate displacements from GNSS permanent stations data. One week period data were analyzed covering the Samothrace strong earthquake event of 6.8M. The sample data were processed with Bernese v5.2 PPP engine and with the online web platform of JPL which uses the GIPSY/OASIS v6.3 software package. Also, for validation purposes the output results were compared with those derived by network analysis by means of the GAMIT processing software of MIT. Our experiments proved the ability to measure dynamic seismic related coordinate variations at sub-centimeter level using the PPP algorithm. But this is efficient when strong earthquakes occurs and for stations close to epicenter. Keywords: GNSS data, precise point positioning, earthquake, site displacements. ΠερίληψηΣτην παρούσα μελέτη η μέθοδος του ακριβούς απόλυτου προσδιορισμού θέσης (PPP) εφαρμόζεται σε δεδομένα μόνιμων σταθμών GNSS. Σκοπός είναι η μελέτη της χρησιμότητας της μεθόδου για την εκτίμηση μετακινήσεων μέσω της μεταβολής των συντεταγμένων των σταθμών που προκαλούνται ύστερα από έντονα σεισμικά φαινόμενα. Στην συγκεκριμένη εφαρμογή αναλύεται ένα χρονικό διάστημα δεδομένων GNSS μίας εβδομάδας μέσα στο οποίο συνέβη ο ισχυρός σεισμός της Σαμοθράκης (Μάιος 2014).Τα δεδομένα επεξεργάζονται εκ των υστέρων με τη χρήση λογισμικών ερευνητικού χαρακτήρα όπως είναι τα προγράμματα Bernese v5.2 και GIPSY/OASIS v6.3. Τα εξαγόμενα αποτελέσματα συγκρίνονται με τα αντίστοιχα που προκύπτουν με την εφαρμογή του σχετικού προσδιορισμού θέσης και με χρήση του λογισμικού GAMIT. Η ανάλυση των αποτελεσμάτων δείχνει ότι οι σεισμικές μετατοπίσεις θέσης μπορούν εκτιμηθούν με πολύ καλή ακρίβεια εάν ικανοποιούνται κάποια κριτήρια όπως είναι η διάρκεια των παρατηρήσεων GNSS, η απόσταση του σταθμού από το επίκεντρο αλλά και η ένταση του σεισμού. Λέξεις κλειδιά: Επεξεργασία δεδομένων μόνιμων σταθμών GNSS, εκτίμηση μετακινήσεων, ισχυρός σεισμός.

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“…Relative positioning is highly Figure 1. Earthquake activity in 24 May 2014 between islands Lemnos and Samothraki NE of Greece accurate, and commonly used in Earth sciences (Bitharis et al, 2016). A type of a standalone point positioning techniques available in post process is the Precise Point Positioning (PPP).…”

Section: Tec Values Estimation Using Gnss Datamentioning

confidence: 99%

Study of Tec Variations Using Permanent Stations GNSS Data in Relation With Seismic Events. Application on Samothrace Earthquake of 24 May 2014

Pikridas

Bitharis

Katsougiannopoulos

et al. 2019

Geodesy and Cartography

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This study investigates the ionospheric total electron content (TEC) variations prior to the earthquake (MW = 6.9) of 24 May 2014 in Samothraki island of north Aegean Sea in Greece. TEC estimates were analyzed using data from GNSS (GPS+Glonass) permanent networks with the aim to detect possible ionospheric anomalies associate with the seismic event. The test period covers one week of data, 4 days before and two days after the event. Selected GNSS stations are scattered around seismic epicenter of distances from 16 up to 1375 km. TEC values estimated for every hour using PPP technique with Bernese GPS software. A comparison with global TEC estimates derived from CODE and JPL institute confirms the validation of results. It is found that a significant decrease 1-day prior to earthquake occurs at all of the selected stations. This result is not obvious when standard ionospheric model is performed for the estimation of TEC. Therefore, in such cases the use of dedicated GNSS processing data scenario is mandatory. A spatial analysis on TEC estimates with geometrical properties shows that the 1-day decrement is related with the EQ shock and may point the location area of the Earthquake. Finally, we conclude that the lithosphere-atmosphere-ionosphere coupling (LAIC) mechanism through acoustic or gravity waves has a key role for this phenomenology.

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The Samothrace Earthquake of May 2014 and the Displacements Estimations Using Permanent GPS Stations Data

Abstract: The contribution of GPS networks in monitoring seismic events is important because they can provide a direct geometrical information on the

Cited by 3 publications

References 6 publications

Geodetic Evidence for Post-Seismic Deformations Following the 2014 North Aegean Mw 6.9 Earthquake

Geodetic Evidence for Post-Seismic Deformations Following the 2014 North Aegean Mw 6.9 Earthquake

Monitoring Seismic Displacements Using GNSS Data With PPP Method

Study of Tec Variations Using Permanent Stations GNSS Data in Relation With Seismic Events. Application on Samothrace Earthquake of 24 May 2014

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