Just curious, and again O/T (sorry). From the link you gave:
http://www.quakes.bgs.ac.uk/recbrit.html

How do you get a negative magnitude earth tremor/quake?

"Steve" wrote in message
...

"Jonathan Stott" wrote in message
...
Jon O Rourke wrote:

Reports of a tremor in Wales. I'm sure I felt something here in Exeter
about 90mins ago.

There's nothing showing on
http://earthquake.usgs.gov/recenteqs...on/Europe.html at the
moment (1325z).

http://www.earthquakes.bgs.ac.uk/latest_info.htm