Abstract: By using the geomagnetic vertical component (Z) in Guanzhong region, Shaanxi province as a load-unload response parameter in computing DS (Z), it is found from the changes of loading-unloading response ratio P (Z) of DS (Z) that, before the Jing yang earthquake anomaly changes of P (Z )≥ 3. 5 occurred at Jing yang and Qianling geomagnetic stations, which are close to the epicenter. Instead, there was not such change tha to ccurred in Zhouzhi and Huayin counties. It is shown that the loading-unloading response ratio method can be used to predict moderately strong earthquakes in Guanzhong region, Shaanxi province. It indicates that geographic locations of observational stations and geological structures beneath them should be considered when this method is used.

Key words: Faul tzone, Ratio of loading-unloading response, Geomagnetic storm time field, Jingyang earthquake