Results show that the time sequence of earth resistivity displayed a fractional structure and an obvious reduction of dimensional variation before earthquakes.
结果表明：地电阻率时间序列存在分维结构，并且在地震前有明显的降维变化。
Wave equation time migration fails to image subsurface geological structure correctly in the case of obvious lateral seismic velocity variation.
当介质的速度在横向上存在较大的变化时，波动方程时间偏移不能使地下的构造正确成像。
Thermoacoustic theory has been studied particularly by exploring the time structure of acoustic signals and the law of acoustic pulse amplitude variation.
通过对水声信号的时间结构和声脉冲幅度变化规律的测定，着重研究了热声理论。
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