Effect of Meteorological Factors on the Level of Microseismic Noise during Long-Term Gravimetric Observations

Resumo

To determine the degree of influence of meteorological factors on long-term gravimetric measurements, crustal reaction to the variable atmospheric pressure is estimated in the frequency range corresponding to the period of accumulation of one and series of single counts of the gravimeter. The experiment revealed a change in the level of microseismic oscillations caused by variable atmospheric pressure. The experimental results of long-term observations at a gravimetric measurement point indicate that the level of microseismic oscillations is significantly lower at higher atmospheric pressure. With a decrease in atmospheric pressure, the highest amplitudes in the microseismic noise spectrum are observed in the frequency range of 0.05–0.5 Hz. The necessity of removing daily variations in the microseism levels caused by variable ambient temperature is shown.