Aftershock sequence of Alaskan earthquake of 28th, March 1964
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The aftershock sequence of Alaskan earthquake has been studied following the creep theory of aftershocks byBenioff. In this sequence the recovery consists of two linear segments of compressional elastic creep type and the duration of activity is about 24 days. The ratio of the total elastic strain rebound increments of aftershocks to the principal shock was 0.24 and their energy ratio released as seismic waves was 0.004. Therefore 2% of the total strain energy stored in the creep elastic element was used as seismic waves and rest, lost as heat. In dual type recovery, where compression is followed by shear, shows 6 to 8% of total energy used as seismic waves. Hence major portion of seismic wave energy is due to shear type of recovery.
KeywordsSeismic Wave Elastic Strain Wave Energy Total Strain Major Portion
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