Average Motion

“Cuadrilla said it appreciated the tremor [of 2.9 magnitude] had ’caused concern for local people’ and said ‘it is worth noting that this event lasted for around a second and the average ground motion recorded was 5mm per second. … This is about a third of that permitted for construction projects.'” https://www.bbc.co.uk/news/uk-england-lancashire-49471321

However, there is a much higher requirement for destruction projects.