Abstract
The low-frequency seismic noise recorded by the broadband IRIS stations in 1994–2012 is studied in the period range of 40 to 360 s. It is shown that for samples of a few months in length, the power spectra of noise at stations spaced apart a few thousand kilometers and operating in different meteorological and seismotectonic conditions are overall similar, which indicates that the sources of the noise are global. At the same time, the slope of the spectra changes with the increase in the period in the subintervals of 40–90, 120–200, and 200–360 s, which points to the difference of the sources generating the seismic noise. The amplitude of the noise at the stations located a few thousand km apart from the Sumatra earthquake of December 26, 2004, M = 9.2, and from the Tohoku earthquake of March 11, 2011, M = 9.0, increased after these events. This indicates the global character of the aftermath of these seismic catastrophes. After the Kronotskoe earthquake of December 5, 1997, which was weaker (M = 7.9), the noise grew only at the PET station located within 300 km of the epicenter. According to the records at the PET station, this earthquake was preceded by the increased noise level observed in 1994–1997. After 1999, the seismic noise declined and remained low up to the end of the studied interval with a duration of 14 years. Our results show that the low-frequency seismic noise generated by the sources in the atmosphere of the Earth is contributed by the processes taking place in the lithosphere.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Ekstrom, G., Time domain analysis of Earth’s long-period background seismic radiation, J. Geophys. Res., 2001, vol. 106, no. B11, pp. 26483–26493.
Hardle, W., Applied Nonparametric Regression, Cambridge: Cambridge University Press, 1989.
Kobayashi, N. and Nishida, K., Continuous excitation of planetary free oscillations by atmospheric disturbances, Nature, 1998, vol. 395, pp. 357–360.
Kobzar’, A.I., Prikladnaya matematicheskaya statistika (Applied Mathematical Statistics), Moscow: Fizmatlit, 2006.
Kulaichev, A.P., Metody i sredstva analiza dannykh v srede Windows. Stadia 6.0 (Methods and Tools for Data Analysis in Windows. Stadia 6.0), Moscow: NPO Informatika i komp’yutery, 1996.
Lyubushin, A.A., Analiz dannykh sistem geofizicheskogo i ekologicheskogo monitoringa (Analysis of the Data from Geophysical and Ecological Monitoring Systems), Moscow: Nauka, 2007.
Nishida, K., Kobayashi, N., and Fukao, Y., Origin of Earth’s ground noise from 2 to 20 mHz, Geophys. Res. Lett., 2002, vol. 29, no. 10, pp. 52-1–52-4.
Ott, E., Chaos in Dynamic Systems, Cambridge: Cambridge University Press, 2002.
Sobolev, G.A., Microseismic variations prior to a strong earthquake, Izv., Phys. Solid Earth, 2004, vol. 40, no. 6, pp. 455–464.
Sobolev, G.A., Lyubushin, A.A., and Zakrzhevskaya, N.A., Synchronization of microseismic variations within a minute range of periods, Izv., Phys. Solid Earth, 2005, vol. 41, no. 8, pp. 599–621.
Sobolev, G.A., On some properties in the emergence and evolution of the oscillations of the Earth after earthquakes, Izv., Phys. Solid Earth, 2013, vol. 49, no. 5, pp. 610–625.
Tanimoto, T., Um, J., Nishida, K., and Kobayashi, N., Earth’s continuous oscillations observed on seismically quiet days, Geophys. Res. Lett., 1998, vol. 25, pp. 1553–1556.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © G.A. Sobolev, D.G. Sobolev, I.N. Migunov, N.A. Zakrzhevskaya, 2014, published in Fizika Zemli, 2014, No. 4, pp. 15–24.
Rights and permissions
About this article
Cite this article
Sobolev, G.A., Sobolev, D.G., Migunov, I.N. et al. Some properties of low-frequency seismic noise. Izv., Phys. Solid Earth 50, 474–483 (2014). https://doi.org/10.1134/S1069351314040168
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1069351314040168