In article ,
Michael Gibson writes:
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?

The scale is logarithmic, isn't it? So each subtraction of 1 from the
magnitude will indicate a reduction in the intensity by a factor of 10.
--
John Hall

You can divide people into two categories:
those who divide people into two categories and those who don't