Okay, you can call it what you will. But I looked further, and, just like the fact that Centigrade and Celsius are often used interchangeably - but are not identical - here's what got me to call you on the change from "Richter Scale" to magnitude. This is from Wikipedia.
The Richter scale was defined in 1935 for particular circumstances and instruments; the instrument used would became saturated by strong earthquakes and unable to record high values. The scale was replaced by the moment magnitude scale (MMS); for earthquakes adequately measured by the Richter scale, numerical values are approximately the same. Although values measured for earthquakes now are actually M_w (MMS), they are frequently reported as Richter values, even for earthquakes of magnitude over 8, where the Richter scale becomes meaningless. Anything above 5 is classified as a risk by the USGS.
I'll make the guess that since Richter becomes meaningless over 8 - a dang big earthquake - the name has been generally dropped from usage. To many folks it's still the word to use for 'quake magnitude, though.