Abstract: There are 21 sets of digitized record instruments of underground water level in Hebei Province. Digitized observation of underground water level has been carriedon together with the traditional simulated observation since 10/01/2001. Compared with the traditional simulated observation, digitized observation has the advantages of rapid data transmission, larger amount of information and less man-madeerror. It will greatly increase the high frequency and shortperiod information of underground water level, and improve significantly our ability to catch short-term and imminent precursory anomalies. The results of com parative analysis show that the data variation characteristics of digitized observation are identical to those of simulated observation. In this paper, we mainly discuss some methods′application on the data of digitized observation, which is a series of hourly value analysis methods used in simulated observation before.

Key words: Digitized observation, Data of underground water level, Method application, Solid tide