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DEPARTMENT OF PHYSICS YOKOHAMA CITY UNIVERSITY, KANAZAWA-KU, YOKOHAMA 236 Japan
DEPARTMENT OF EARTH SCIENCES NAGOYA UNIVERSITY, CHIKUSA, NAGOYA 464 Japan
Abstract
The seismic wave energy is evaluated for 35 large earthquakes by inverting far-field long-period P waves into the multiple-shock sequence. The results show that the seismic wave energy thus obtained is systematically less than that inferred from the Gutenberg-Richter's formula with the seismic magnitude. The difference amounts to one order of magnitude. The results also show that the energy-moment ratio is well confined to a narrow range: 10–6 < ES/Mo < 10–5 with the average of 
5 x 10–6. This average value is exactly one order of magnitude as small as the energy-moment ratio inferred from the Gutenberg-Richter's formula using the moment magnitude. Comparing the energy-moment ratio with 
o/2µ, where o and µ are the stress drop and the rigidity, we obtain an empirical relation: ES/Mo 0.1 x 0/2µ. Such a relation can be interpreted in terms of a subsonic rupture where the energy loss due to cohesion is not negligible to the seismic wave energy.
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