Sonic boom and not an earthquake

On 10 October, 2013 shortly before 2 pm local time, numerous seismic stations operated by the Swiss Seismic Network recorded an unusual signal across NE Switzerland.  Two impulsive signals roughly 7 seconds apart spread slowly from near Lucerne towards Basel. A careful analysis of the signals showed they could not be produced by an earthquake or a quarry blast. Judging by the velocity the signal moved across the region, a more likely explanation would be a sonic boom produced by a Jet or a meteorite.

The Swiss Air Force have since confirmed that there indeed were two aircrafts flying across the region at supersonic speeds at this time. Judging by the felt reports submitted to the SED website, the pressure waves produced light shaking that was particularly strongly felt in Kanton Aargau.

The image on the top shows the waveforms recorded by Swiss seismic stations showing the seismic boom from the two aircraft as two separate signals roughly 7s apart.