The natural frequency of this kind of geophone is 8Hz, 10 Hz, 14 Hz, 17 Hz and 40 Hz. Its distortion is ¡Ü0.2%, and the horizontal natural frequency is £¾10 M¦¸.This series of products can be extensively suitable for the exploration of different environments of the earth¡¯s surface, such as marsh, hills, Gobi desert, mountain region, desert, etc. under different association forms.