The Omnidots SWARM has measured the earthquake of May 22 in Groningen. To show what we measure in an earthquake, we show two measuring points below.
Measuring point 1 is at a location in Bedum:
Measuring point 2 is at a location in South-West of the city of Groningen:
The delay time between the two measurement points is clearly visible in the measurement results. By comparing measurement data, you get even more information from measurements.