The large scale and amplitude of gravity field anomaly variation appeared in north Shanxi area before the earthquake.
晋北地区地震前后出现了明显的重力场变化，并具有异常范围大、幅度高的特点。
2
The pilot study indicates that the PS wave amplitudeanomaly will hopefully be a convincing criterion to detect fissure zone.
初步研究表明，PS波振幅异常有望成为强裂隙探测的有力判据。
3
The telluric resistivity anomaly of moderate strong earthquake has a complicated feature, the length of the anomaly duration is only 60-90 days, the amplitude of the anomaly is 1-2%.