Modern Existence
It is now best viewed as a block of dense crust floating deeply sunk into the mantle and overlain with less dense superficial rocks. It depresses the boundary of the crust and the mantle (Mohorovičić discontinuity, commonly Moho) to depths greater than 40 kilometres as against a figure at the top of the continental shelf of about thirty and less than fifteen below oceanic depths.3
The map shows that there is some tendency for such seismic activity as there is in the region, to occur around the margin of the massif. It was into this pattern that the Dover Straits earthquake of 1580 and the 2008 Lincolnshire earthquake, the latter marked by an orange star, fell.
Read more about this topic: London-Brabant Massif
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