Anomaly in high-frequency geoacoustic emission as a close earthquake precursors

Gordienko V.A.1, Gordienko T.V.1, Krasnopistsev N.V.2, Kuptsov A.V.3, Larionov I.A.3, Marapulets Yu.V.3, Shevtsov B.M.3, Rutenko A.N.4
  1. Moscow State University
  2. All-Russia Research Institute of Physicotechnical and Radio-Engineering Measurements
  3. Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS
  4. Il'Ichev Pacific Oceanological Institute FEB RAS

One of the possible earthquake precursor mechanisms, namely, acoustic emission, is discussed.The phenomenon of acoustic emission consists in the emission of acoustic pulses due to the formation of microfaults and cracks that precede fracture of objects, rock collapse in mines, eartquakes, etc. By the example of the geoacoustic emission observation in the Kamchatka Peninsula in the area of the Avachinskaya Bay and by the analysis of anomalies of this emission that accompany major seismic events, it is shown that anomalous geoacoustic noise is generated by the stress produced in the medium prior to these events. The high-frequency range (4-11 kHz) is most informative for the observation of geoacoustic noise cased by the crack formation processes.

Anomaly in high-frequency geoacoustic emission as a close earthquake precursors / Gordienko V.A., Gordienko T.V., Krasnopistsev N.V. [et al.] // Acoustical Physics. 2008. Vol. 54. No. 1. P. 82-93.