Re: Magnitudes
Posted by Mike Williams in Arroyo Grande on March 21, 2009 at 07:38:40:

The concept of zero or negative magnitude quakes is easy to visualize if you look at the actual scale that Richter designed (link below)

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     ● OOPS - accidentally hit Send - Mike Williams in Arroyo Grande  07:50:04 - 3/21/2009  (74987)  (0)