The first is to interpret the time-domain airborne electromagnetic data measured at different flying altitude so that the earthresistivity will be provided.
其一是解释在不同飞行高度测得的时间域航空电磁法资料，从而提供大地电阻率；
2
Results show that the time sequence of earthresistivity 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。
3
The paper also discussed the variation features of the sudden change of earthresistivity as well as the shape of sudden change and its temporal-spatial distribution.