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of major earthquakes are measured on the Moment Magnitude Scale, or MMS, although the media often still refer to the outdated Richter scale.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 2001 earthquake in India that measured 7.7 Mw and the 2011 earthquake in Japan that measured 9.0 Mw. (The earthquake in Japan generated a 28-foot tsunami wave that traveled six miles inland, killing 24,000 and causing an estimated $300 billion in damage, making it the most expensive natural disaster ever recorded.)
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