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Scientific Station of United Institute for High Temperatures (IVTRAN), Russian Academy of Science, Bishkek, Kyrgyzstan
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- PublicationOpen AccessVariations in geoacoustic emissions in a deep borehole and its correlation with seismicity(2008-10)
; ; ; ; ;Gavrilov, V.; Institute of Volcanology and Seismology, Far East Branch of the Russian Academy of Science, Petropavlovsk-Kamchatsky, Russia ;Bogomolov, L.; Institute of Marine Geology and Geophysics Far East Branch, of the Russian Academy of Science, Yuzhno-Sakhalinsk, Russia ;Morozova, Y.; Institute of Volcanology and Seismology, Far East Branch of the Russian Academy of Science, Petropavlovsk-Kamchatsky, Russia ;Storcheus, A.; Institute of Volcanology and Seismology, Far East Branch of the Russian Academy of Science, Petropavlovsk-Kamchatsky, Russia; ; ; Continuous geoacoustic emission (GAE) measurements were acquired using a three-component geophone placed in a borehole at a depth of near 1000 m at Petropavlovsk-Kamchatsky starting in August 2000. Using geophones consisting of magneto-elastic crystal ferromagnetic sensors, and installed at such a depth allows measurement of natural geoacoustic background with signal amplitude less than 1×10-4 m/s3 in frequency band from 3 to 1500 Hz. According to the data from a 4-year survey period the characteristics of diurnal geoacoustic variations change before every earthquake with MLH≥ 5.0 that occurs at a distance of less than 300 km from the observation point or before each earthquake with MLH≥5.5 occurring at distance R≤550 km from the observation point. The changes in GAE regime correlate with the strongest earthquakes that occurred during survey period. Measurements of the natural electromagnetic field of the Earth were carried out simultaneously with the help of an underground electric antenna. The behavior of GAE in aseismic periods appears to be related to the effect of diurnal variations of the natural electromagnetic field.305 2195 - PublicationOpen AccessAcoustic emission responseof rocks to electric power actionas seismic-electric effect manifestation(2004)
; ; ; ; ; ; ;Bogomolov, L. M.; Scientific Station of United Institute for High Temperatures (IVTRAN), Russian Academy of Science, Bishkek, Kyrgyzstan ;Il'ichev, P. V.; Scientific Station of United Institute for High Temperatures (IVTRAN), Russian Academy of Science, Bishkek, Kyrgyzstan ;Novikov, V. A.; Institute for High Temperatures, Russian Academy of Science, Moscow, Russia ;Okunev, V. I.; Institute for High Temperatures, Russian Academy of Science, Moscow, Russia ;Sychev, V. N.; Scientific Station of United Institute for High Temperatures (IVTRAN), Russian Academy of Science, Bishkek, Kyrgyzstan ;Zakupin, A. S.; Scientific Station of United Institute for High Temperatures (IVTRAN), Russian Academy of Science, Bishkek, Kyrgyzstan; ; ; ; ; Two parts of the research are distinguished in this paper. The first part is devoted to the structure of signals of Acoustic Emission (AE) and electromagnetic emission (EME) which accompany the inelastic straining of terrestrial materials. Special attention is paid to the similarity of waveform of EME signals at various scale lengths. The second (and main) part of the work involves the investigation of AE responses to the action of additional power fields over strained rocks. Our experimental investigations have revealed the interrelation of acoustic emission activity to power actions applied externally (impacts of electromagnetic field). Different modes of responses to electromagnetic impact have been specified. The characteristics of such responses and their variations depending on the material of specimens tested and of electric parameters of external pulses during power impacts have been considered. A general conclusion on possible electromagnetic triggering of AE has been drawn,the prospects of further studies being outlined.170 260