The moment magnitude scale (MMS; denoted explicitly with Mw or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on ...

Northwest Ohio was rattled early Sunday by a quake, less than two weeks after a small Ohio River town also felt an earthquake ...

The moment magnitude scale, as it is known, replaced one developed by an American seismologist, Charles Richter, that was used until the 1970s. The Richter scale was found to be inaccurate for ...

These scales account for the distance between the earthquake and the recording seismometer so that the calculated magnitude should be about the same no matter where it is measured. Another scale is ...

Data by the USGS and European seismic stations suggest this event was a 7.8 and 6.7 out of 10 on the moment magnitude scale. The shaking caused by energy traveling outwards from the source or ...

How the strength of quakes is measured has changed over the years, so you'll see references to the Richter Scale, earthquake magnitude and intensity. Here's a quick primer on what they mean and ...