ANALYSIS OF FBS-3B SEISMOMETER'S WORK PERIOD AND DAMP IN HEBEI DIGITAL SEISMIC NETWORK

The working period and damp of FBS-3B seismometer in Hebei digital seismic network are analyzed on basis of calibration data in two years, and the deviation characteristics are obtained.The causes of these deviation characteristics and their affect on the amplitude-frequency characteristics are studied.The results show that external environment, particularly the temperature, is the main cause that lead to the deviation of the working period and damp, and then impact the amplitude-frequency.