JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Warwick earthquake seismograms. Recordings, from 7 British Geological Survey sites in North Wales, of the moderate earthquake on 23 September 2000, near Warwick, England. Vertical ground movement speed was recorded using sensitive seismographs. The earthquake struck at 04:23 UTC (GMT, 05:23 local time), and had a 4.2 ML (Local Magnitude). ML is a scale used within 600 kilometres of an epicentre. This earthquake, which was the largest in the UK in the last ten years, originated 13.1 kilometres below the surface. The seven Welsh recording sites (from top) are: Llanberis, Penmaenmaur, Llynfaes, Fairbourne (closest, strongest signal), Rhoscolyn (furthest, weakest signal), Yr Eifl and Rhiw.
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