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Earthquakes near Newdigate, Surrey, 2018

Installing an additional monitoring station in Surrey New seismic station RUSH mid-way through construction

Earthquakes with magnitudes of 2.7, 2.6, 2.4, and 3.0 ML were detected by the BGS on 1 April, 27 June, 29 June and 5 July 2018, respectively, near Newdigate, Surrey, between Dorking and Crawley. These earthquakes were felt by local residents.

Four smaller earthquakes with magnitudes of 1.8, 1.7, 1.5 and 1.9ML were also detected in the same location.

To locate earthquakes we use a process a bit like triangulation. For the Newdigate earthquakes our closest monitoring station was over 50km away, so the errors in our location estimates were several kilometres laterally, and depth could not be accurately calculated.

We've installed two additional monitoring stations within 10km of the area of activity. This will improve location and particularly depth determination should more earthquakes occur. It should also mean we can detect smaller events. If further earthquakes occur, the new data should be invaluable in understanding the origin of the sequence.

Both new stations are continuously streaming ground movement data back to our data centre in Edinburgh for analysis. The data is viewable by the public on our website (http://www.earthquakes.bgs.ac.uk/helicorder/heli.html) under the station names of RUSH and HORS.