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为探索震前声发射的方向与地震的关系,假定声速仅与深度有关,在这种条件下得到的方向公式应该与恒速条件下得到的方向公式一致。为了简化起见,可以用实测时差作为公式中的时差,其误差是允许的。报告中介绍了用互相关函数求时差的方法,并给出部分地声方向的计算结果,初步表明震前声发射的方向与未来震中有着密切关系。
In order to explore the relationship between the direction of the acoustic emission before the earthquake and the earthquake, assuming that the velocity of sound is only related to the depth, the direction formula obtained in this condition should be consistent with the direction formula obtained under a constant speed condition. For simplicity, the measured time difference can be used as the time difference in the formula, and the error is allowed. The report describes the method of cross-correlation function to find the time difference and gives the calculation results of partial acoustical directions. It is preliminarily shown that the direction of acoustic emission before the earthquake is closely related to the future epicenter.