Radiation Efficiency
Radiation Efficiency : A term introduced by Husseini (1977), which corresponds to the ratio between radiated seismic energy and the potential energy available for strain release. In contrast to seismic efficiency, the radiation efficiency accounts only for strain energy loss due to fracturing but not due to the additional conversion into frictional heat and sound energy. Therefore, values of radiation efficiency are significantly larger than those of seismic efficiency. Whereas the former ranges for most earthquakes between 0.25 and 1 (although they may drop even below 0.1 for very slow rupturing tsunami earthquakes) the seismic efficiency is estimated to be only a few percent. See: Kanamori and Brodsky (2002), Bormann and Di Giacomo (2010) and Seismic Efficiency
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