Norwegian independent seismic monitoring foundation NORSAR, who's primary mission is observing compliance with the Comprehensive Nuclear-Test-Ban Treaty, saying seismic signals indicate there was an explosion at the Nova Kakhovka Dam.
"Data from regional seismic stations show clear signals on Tuesday 6 June at 2:54 local time... The time and place coincide with reports in the media about the collapse of the Kakhovka dam. The signals indicate that there is an explosion." Magnitude estimate is between 1 and 2.
The figure below shows the signal from the Bukovina (BURAR) seismic array, a measuring station in Romania. The distance from the dam is 620 km.
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