The Seismological Institute confirmed on Monday morning that an earthquake was detected in Kotka.
In Kotka and Pyhtää, many people woke up in the middle of the night to a banging noise.
The map of the Institute of Seisomology shows an unclassified observation near Petäjäsuo in Kotka.
The event was detected by an automatic detection system at around half past one on Sunday night and Monday night, and the system determined the magnitude to be 2.0 magnitude.
During the morning, the strength of the earthquake was defined as 1.8 magnitude.
– There was nothing unusual about it.
According to Korsström, there may be aftershocks, but they will probably be smaller.
The seismological institute will publish more information about the earthquake on Monday.
The Kymenlaakso rescue service has not had tasks related to the explosion.
More earthquakes observed in Kymenlaakso
Earthquakes occur relatively often in Kymenlaakso.
Earthquakes have occurred in Kotka, for example, in 2015. There have been several earthquakes in Kouvola and Kuusankoski in recent years.
Last week, earthquakes were observed in Eastern Finland.
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