Abstract:The vertical pendulum tiltmeter and seismometer are used to observe the same point, the output signal of the sensor is sampled uniformly, and the data is quantified uniformly with the time domain background noise envelope as the standard. The amplitude spectrum is calculated, and the detection ability of the two instruments for different signals is judged according to the amplitude changes with frequency. On this basis, background noise, seismic wave and solid tide are used as natural test signals to test the detection capabilities of the two instruments. The results show that the amplitude recorded by the vertical pendulum tiltmeter is larger than that of the seismometer for the signal in the long period frequency band of solid tides, and the data recorded by the seismometer in this frequency band is mainly from the instrument noise. For far seismic surface waves, both of the two instruments have good recording effect, and the amplitude recorded by the vertical pendulum tiltmeter is greater than that of the seismometer. The high frequency ground motions caused by near and local earthquakes are outside the response passband of vertical pendulum tiltmeter design and the data are not very comparable.
CUI Qinggu,FANG Wei,DANG Wenjie et al. Comparison between Seismometer and Vertical Pendulum Tiltmeter Observation Data at the Same Point[J]. jgg, 2023, 43(8): 856-860.