Domino-style earthquakes along blind normal faults in Northern Thessaly (Greece): kinematic evidence from field observations, seismology, SAR interferometry and GNSS

Here we present a joint analysis of the geodetic, seismological and geological data March 2021 Northern Thessaly seismic sequence, that were gathered processed as April 30, 2021. First, relocated seismicity from regional local networks inferred dip-direction (NE) dip-angle (38°) 3, rupture plane. Furthermore, used ascending descending SAR images acquired by Sentinel-1 satellites to map co-seismic displacement field. Our results indicate Mw=6.3 occurred on NE-dipping, 39° normal fault located between villages Zarko (Trikala) Damasi (Larissa). The event 4, northwest Damasi, along oriented WNW-ESE produced less deformation than previous day. third 12, south-dipping fault. We computed 22 focal mechanisms aftershocks with M?4.0 using P-wave first motion polarities. Nearly all exhibit kinematics or have dominant dip-slip component. use InSAR was crucial differentiate ground ruptures. majority occurs in vertical component, maximum 0.39 m subsidence over plane, south west Damasi. A total amount 0.3 horizontal (E-W) measured. also GNSS (at 30-s sampling interval) twelve permanent stations near epicentres obtain 3D offsets station positions. Only produces significant at (as predicted models, themselves very well constrained InSAR). calculated several post-seismic interferograms, yet observed there is almost no deformation, except footwall area (Zarkos mountain). This below 7 mm level (quarter fringe) field 1 sites. cascading activation three events SE NW direction points pattern domino-style earthquakes, neighbouring segments. ruptures point counter-clockwise change extension upper crust (from NE-SW N-S towards northwest, Verdikoussa).