关键词: 数字化观测, 模拟观测, 水位资料, 对比分析

Abstract: In this paper we present the comparative analysis of underground water level data obtained from digitized observation and the traditional simulated observation. Digitized observation of underground water level has been carried out for nearly 3 years in Shandong Province. As compared with the traditional simulated observation, digitized observation has the advantages of rapid data transmission, larger amount of information and lower man made error. It will greatly increase the high frequency and short period information of underground water level, and will improve significantly our ability to catch short term and impendent precursory anomalies. The results of comparative analysis in 3 wells at Liaocheng, Dongying and Changyi show that the data of underground water level obtained from digitized observation, including their variation tendency, relative coefficient, sample error and the real values, are identical to those obtained from simulated observation. As digitized observation has the advantages of higher sensitivity and transmission speed, it may replace the traditional simulated observation. The data of digitized observation can be preserved in the database of SQL server linked with the software system (EIS2000) of information processing of earthquake precursors, so that they may be analyzed on time to track the transient variation of water level. The analysis has also indicated that the methods of data analysis used in simulated observation can also be used in digitized observation. In addition, a series of newly developed methods, such as the analysis of tide and the load/unload response ratio can also be applied to analyze the data of digitized observation. The data of tide response become clearer in digitized observation, but the response of the vibration of the underground water caused by earthquake event has become weaker. We believe that with the reformation and perfection of more and more observation stations, the digitized observation will play an important role in earthquake prediction and prevention.

Key words: Digitized observation, Simulated observation, Underground water level data, Comparative analysis