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 ...

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 ...