Taylor Swift's three sold-out concerts in Edinburgh, Scotland, triggered small earthquake readings up to nearly four miles from the venue, according to the British Geological Survey. The biggest seismic activity was generated by fans dancing and reached its peak of 160 beats per minute during the song "...Ready For It?" Taylor Swift's songs "Ready For It?", "Cruel Summer" and "Champagne Problems" generated the most significant seismic activity each night. Friday's concert was the most highly attended concert in Scottish history, with around 73,000 people. Officials estimate the concerts brought an economic boost of around $98 million to Edinburgh.