DISCUSSION OF A KIND OF STRONG AFTERSHOCKS OCCURRING BASED ON FRACTURE MECHANICS
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    Abstract:

    Based on the strain energy density theory on the unstable growth of mixed mode cracks, this paper discusses some problems on fracture law and activity characteristics of strong aftershocks occured at the end of main fracture of large earthquakes. Combining some relative examples, it suggested: 1. the angle between fracture planes of this strong aftershock and its main earthquake should be much more than zero degree; 2. this strong aftershock should generally locate at the corner of attenuation curve of aftershock frequence; 3. the relationship between fracture length and magnitude of strong earthquakes is quite close to the result obtained by Guo Zeng-jian and others. 4. the growth length is about 0.16 time that of main fracture.

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History
  • Received:November 17,1981
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  • Online: June 24,2017
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