“Data is from @BGSseismology station SWN1 located close to the M4 motorway, so this probably reflects less traffic out on the roads.”
In a follow-up tweet, he said: “From the results above, it seems quite clear that over the last few days, the increase in noise level at dawn (blue line) is much less steep than over the past few weeks.
“I guess this is due to a much weaker morning rush hour – fewer people commuting and no school runs.”
According to Thomas Lecocq, a seismologist the Royal Observatory of Belgium in Brussels, the background vibrations seen now are similar to those observed during Christmas but lower.
The geologist said seismic noise in Brussels has fallen by about one-third in response to the coronavirus prevention measures.