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Abstract:
An earthquake sequence started on March 3, 2021, with a moment magnitude of 6.3, followed by an Mw6.0 event on the 4th and an M5.6 event on March 12 in northern Thessaly. This was the most notable seismic sequence in the region that occurred in the last several decades, mainly due to the unexpected triggering mechanism. Moreover, these earthquakes are associated with blind faults. Seismic velocity changes in the epicentral area are investigated utilizing seismic ambient noise correlations. Using vertical component broadband seismic recordings from the local networks between January 1 and December 31, 2021, ambient noise cross-and auto-correlations are calculated. A co-seismic velocity decrease is expected in the epicentral area. The magnitude of seismic velocity variations is correlated with the environmental/secondary effects observed in the region.
