According to the Portuguese Institute of Atmosphere and Sea (IPMA) website, 2 mini earthquakes were recorded last night.
The first occurred at 18:46 off the southwest coast of Ponto do Sol, registering 1.7 on the Richter Scale. The second, slightly smaller earthquake (1.5) was recorded at 19:55, off the Ribeira Brava coastline.
Due to their size they would not have been felt.
info at madeira-weekly.com