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Series of asymmetric pulses in the low-frequency range (Periods of 1–300 min) of microseisms as indicators of a metastable state in seismically active zones

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Abstract

Analysis of microseismic oscillations in a period range of several minutes recorded before the Kronotsky (December 5, 1997), Simushir (November 15, 2006), Hokkaido (September 25, 2003), and Neftegorsk (May 27, 1995) earthquakes revealed series of asymmetric pulses (SAPs) arising a few days before the earthquakes. Records of IRIS stations located at various distances from epicenters of the earthquakes were analyzed. SAPs were recorded only by stations located in a seismoactive zone in which an earthquake occurred. The SAP onset times and amplitudes are uncorrelated with the microseismic noise level in a period range of several seconds caused by storm phenomena in the ocean and other meteorological factors. Some intervals between successive pulses had the same length, which indicated a periodicity of their occurrence. It is supposed that SAPs can be caused by elastoplastic displacements in a fault zone.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences (RAS), Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia

    G. A. Sobolev

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  1. G. A. Sobolev
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Original Russian Text © G.A. Sobolev, 2008, published in Fizika Zemli, 2008, No. 4, pp. 3–16.

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Sobolev, G.A. Series of asymmetric pulses in the low-frequency range (Periods of 1–300 min) of microseisms as indicators of a metastable state in seismically active zones. Izv., Phys. Solid Earth 44, 261–274 (2008). https://doi.org/10.1134/s11486-008-4001-7

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  • DOI: https://doi.org/10.1134/s11486-008-4001-7

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