Fribourg Rocks indeed !
On the morning of 10th of April, at 5.46, a magnitude 2.2 earthquake was felt in Fribourg. Numerous people in the city and in the vicinity have felt the quake and heard a ”bang”. The epicenter is in the centre of the city of Fribourg close to the railway station and located at a depth of 4.2 km (manual localization by SED). This event probably belongs to the cluster below the city of Fribourg determined in the work of Naomi Vouillamoz (see previous post with map and paper reference).
Read details on the website of SED