Earthquakes can be detected and located using networks of seismometers. In the UK these are installed and managed by the British Geological Survey (BGS). The energy from an earthquake reaches seismometers at different times, depending on how far away they are from the event and the speed that the signal (vibration) travels through the rocks. If the same earthquake is detected at several seismometers, it is possible to calculate the location, magnitude and depth of the earthquake. There is limited coverage by the national network in Cornwall but Geothermal Engineering Ltd (GEL) has installed a more sensitive network to improve our detection limits and accuracy. The location of the seismometers within this network will be moved to suit new development sites.