GENERAL: Earthquakes The sizes of major earthquakes are measured on the Moment Magnitude Scale, or MMS, although the media often still refer to the outdated Richter scale. The MMS measures the total energy released by an earthquake, in units denoted Mw (W for the work accomplished). An increase of 1 Mw means the energy increased by a factor of 32, so an increase from A to B means the energy increased by a factor of 32B - A. Use this formula to find the increase in energy between the following earthquakes:
The 1994 Northridge, California, earthquake that measured 6.7 Mw and the 1906 San Francisco earthquake that measured 7.8 Mw . (The San Francisco earthquake resulted in 3000 deaths and a 3-day fire that destroyed 4 square miles of San Francisco.)
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