Before revision: The moment magnitude scale – Mw or Mw – developed by seismologists Thomas Hanks and Hiroo Kanamori , is based on an earthquake's seismic moment, M0, a measure of how much work an earthquake does in sliding one patch of rock past another patch of rock.The IASPEI standard formula for deriving moment magnitude from seismic moment is =(2/3)(log–9.1).
After revision: The moment magnitude scale – Mw or Mw – developed by seismologists Thomas Hanks and Thomas C. Hanks and Hiroo Kanamori , is based on an earthquake's seismic moment, M0, a measure of how much work an earthquake does in sliding one patch of rock past another patch of rock.The IASPEI stard formula for deriving moment magnitude from seismic moment is =(2/3)(log–9.1).