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A strong earthquake struck Heraklion, Crete, on Friday afternoon.
According to the Institute of Geodynamics, the earthquake had a magnitude of 5.3 on the Richter scale and its epicenter was located in a maritime area 19 kilometers southwest of Arvi.
Its focal depth is 25.8 km. 
According to local Cretan media, the earthquake lasted for a long time and was felt in the city of Heraklion.
The Euro-Mediterranean Institute said the earthquake had a magnitude of 5.7 on the Richter scale.
M5.7 #earthquake (#earthquake) hits 55 km S of #Irákleion (#Greece) 12 minutes ago. Updated map of its effects: pic.twitter.com/PkDBbw2Sdd
– EMSC (@LastQuake) September 18, 2020
What seismologists estimate
Talking to in.gr Efthymios Lekkas, professor of geology and president of OASP, was reassuring about the continuation of the phenomenon.
As he estimated, no problem is expected, because the depth is 50 km. “I don’t think we have a rich sequence of earthquakes.”
According to him, the earthquake was felt strongly, while small falls have been reported.
He stressed that the area is quite seismic.
For his part, the seismologist Gerasimos Papadopoulos, speaking in in.gr, argued that today’s earthquake may be a strong aftershock that occurred in the area on May 2, of magnitude 6.6 Richter.
As he said, in the last minutes there have been two, three aftershocks, the largest with a magnitude of 3.4 Richter, while he characterized it as very normal for others to follow.
According to him, this entire area is called the “Greek Trench” and consists of an area of active faults that give rise to strong earthquakes. For now, however, there is no cause for concern.
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