Seismic instruments: article

Broadband registration of the high-frequency seismic noise for the tidal effects study
A. Cherepantsev1
V. Saltykov2
Y. Kugaenko2
P. Voropaev2
1 Southern Federal University, Taganrog, Russia
2 Kamchatka Branch of Federal Research Center “Joint Geophysical Survey of Russian Academy of Sciences”
Journal: Seismic instruments
Tome: 53
Number: 1
Year: 2017
Pages: 29-43
UDK: 550.34.038.8:550.348.432:523.31-423.3:550.344.37
DOI: 10.21455/si2017.1-3
Keywords: accelerometer, seismic noise, seismic emission, piezoelectric bending type transducer, Earth tides
Аnnotation: The possibility of recording high-frequency seismic noise in a wide frequency range (f = 5-400 Hz) is considered. For this purpose, we have designed an accelerometer with bimorph piezoceramic plates based on the S-mode of bending vibrations. The instrument makes it possible to increase the sensitivity and expand the frequency range. The functional concept and basic technical characteristics of the broadband accelerometer are given. Pilot seismic noise registration with the broadband accelerometer was carried out at “Nachiki” seismic station in Kamchatka. The first results are presented of the comparison of the tidal effects in the seismic noise recorded during long-term simultaneous registration in 2014-2015 with the broadband accelerometer (f=5-400 Hz) and the resonant sensor (f0=30 Hz) placed on a single seismic basement. Compelling evidence is obtained for the existence of tidal modulation of seismic noise in a wide frequency range (~ 70-320 Hz). The use of broadband registration seems promising for predicting strong earthquakes because of its higher accuracy