geosciences Article The Use of Interferometric Synthetic Aperture Radar for Isolating the Contribution of Major Shocks: The Case of the March 2021 Thessaly, Greece, Seismic Sequence Cristiano Tolomei 1,* , Riccardo Caputo 2, Marco Polcari 1 , Nicola Angelo Famiglietti 1 , Massimiliano Maggini 3 and Salvatore Stramondo 1 1 Istituto Nazionale di Geofisica e Vulcanologia (INGV), 00143 Roma, Italy;
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[email protected] (S.S.) 2 Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, 44121 Ferrara, Italy;
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[email protected]; Tel.: +39-06-51860384 Abstract: We study the surface deformation following a moderate size M5+ earthquake sequence that occurred close to Tyrnavos village (Thessaly, Greece) in March 2021. We adopt the interferometric synthetic aperture radar (InSAR) technique to exploit several pairs of Sentinel-1 acquisitions and Citation: Tolomei, C.; Caputo, R.; successfully retrieve the ground movement caused by the three major events (M5+) of the sequence. Polcari, M.; Famiglietti, N.A.; Maggini, M.; Stramondo, S. The Use The mainshocks occurred at depths varying from ~7 to ~10 km, and are related to the activation of at of Interferometric Synthetic Aperture least three normal faults characterizing the area previously unknown. Thanks to the 6-day repeat Radar for Isolating the Contribution time of the Sentinel-1 mission, InSAR analysis allowed us to detect both the surface displacement of Major Shocks: The Case of the due to the individual analyzed earthquakes and the cumulative displacement caused by the entire March 2021 Thessaly, Greece, Seismic seismic sequence.