2008 Market Rasen earthquake Caythorpe, all three in South Kesteven. The cost of insurance payouts was estimated to be around £30 million, with the majority of damage being done to chimneys, roof tiles and by falling masonry. The tremor was the largest earthquake to affect the UK since the 1984 Llŷn Peninsula earthquake, which measured 5.4 on the Richter scale. The British Geological Survey gave the earthquake a reading of 5.2M, while the United States Geological Survey reported it measured 4.8M. The French Atomic Energy Commission estimated the magnitude was 5.4M. A total of nine aftershocks were recorded. The largest, measuring 2.8 on the
Logarithmic scale the value of a logarithm function. Here, a given logarithmic unit will be denoted using the notation [log "n"], where "n" is a positive real number, and [log ] here denotes the indefinite logarithm function Log(). Examples of logarithmic units include common units of information and entropy, such as the "bit" [log 2] and the "byte" 8[log 2] = [log 256], also the "nat" [log e] and the "ban" [log 10]; units of relative signal strength magnitude such as the "decibel" 0.1[log 10] and "bel" [log 10], "neper" [log e], and other logarithmic-scale units such as the Richter magnitude scale