Abstract
On 3 March 2021, a strong shallow earthquake affected northern Thessaly, Greece, with an epicenter close to Damasi village causing significant destruction of many stone houses. In this contribution, we provide fieldwork observations, satellite radar interferometry, mapping of the active faults exposed in the epicentral area, liquefactions and coseismic surface ruptures, and preliminary geomorphological analyses of the epicentral area. The geomorphological analysis is based on air photographs, digital surface models analysis, Real-Time Kinematik (RTK) measurements with Global Navigation Satellite System (GNSS) receivers, and data from UAV flight campaigns. Although the seismotectonic setting of the area is complex and there is an apparent mismatch between field and interferometric data, the results of our investigations suggest that at least three fault segments were reactivated by the major shocks of the March seismic sequence. These tectonic structureslikely represent the westward propagation of the Tyrnavos Graben, where newly formed and inherited low-angle faults interplay in a complex manner.
Highlights
The 2021 seismic sequence of Central Greece, called hereinafter the Damasi earthquake, began on the 3rd of March with an Mw 6.3 earthquake
More seismological details are beyond the goals of this research, and we address the reader to more specific papers (e.g., [26,27]).The post event investigation includes mapping of the active faults exposed in the epicentral area, liquefaction features, and coseismic surface ruptures
Field data and the interferograms show that the causative faults of the Damasi seismic sequence occupy the westernmost sector of the Tyrnavos Graben [7] (Figure 1) and probably represent the embryonic stage of the lateral propagation of the northern Thessalian basin
Summary
The 2021 seismic sequence of Central Greece, called hereinafter the Damasi earthquake, began on the 3rd of March with an Mw 6.3 earthquake (magnitude from NOA). In a right-stepping geometry and with a partial overlap, the synthetic Larissa Fault shows evidence of neotectonic activity [16] This structure borders to the south the Tyrnavos Graben, striking ESE–WNW for about 25 km [4] (Figure 1). Antithetic to the Larissa and Tyrnavos faults and bordering to the north the graben are the Gyrtoni and Rodia Faults [7,9,11,18] For both faults, palaeoseismological investigations and morphotectonic analyses document the recent linear morphogenic activity [19], none of them reactivated during the March 2021 seismic sequence. 13 May 1995 9 July 1980 8 March 1957 19 April 1955 April 1954 1 March 1941 March 1930 23 February 1930 22 October 1911
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