Abstract
The most probable cause of simultaneous anomalous radiations in electromagnetic and acoustic fields, different in nature, is intensification of deformation processes during strong earthquake preparation. To verify this fact, simultaneous observations of electromagnetic signals and acoustic emission in the frequency range from 0.1 Hz to 11 kHz were carried out in Kamchatka. In the result of the experiment, radiation bursts appeared about 24 hours before a seismic event with MLH=5.4. Such bursts were not observed on other days within this time of a day in August-September, 2013.
Highlights
Investigation of acoustic and electromagnetic fields during increased seismic activity were carried out in different regions [1, 2], there are just a few simultaneous observations in natural conditions
In the course of data analysis it was discovered that radiation bursts almost simultaneously occurred in electromagnetic and acoustic fields in the frequency range from 200 Hz to 11 kHz (Fig. 1, at the bottom) on September 1, 2013 between 04:00 and 09:00 UT at «Karymshina» and «Mikizha» sites
The inconsistency of the number of received signals from lightning by World Wide Lightning Location Network (WWLLN) network and «Karymshina» and «Paratunka» sites is explained by the difference in instrumentation and radiation registration methods
Summary
Investigation of acoustic and electromagnetic fields during increased seismic activity were carried out in different regions [1, 2], there are just a few simultaneous observations in natural conditions. In the course of data analysis it was discovered that radiation bursts almost simultaneously occurred in electromagnetic and acoustic fields in the frequency range from 200 Hz to 11 kHz (Fig. 1, at the bottom) on September 1, 2013 between 04:00 and 09:00 UT at «Karymshina» and «Mikizha» sites Such bursts were not observed on other days within the same period of a day. The inconsistency of the number of received signals from lightning by WWLLN network and «Karymshina» and «Paratunka» sites is explained by the difference in instrumentation and radiation registration methods It was established by the researches which had been carried out before [6] that in spite of the indicated differences, quite good agreement of the data was observed when lightning azimuths were determined. It is quite possible that some local radiation sources appeared, the power of which is sufficient to be detected by closely located electromagnetic sensors located at «Karymshina» and «Paratunka» sites but insufficient to be registered by remote sensors of WWLLN network due to signal strong attenuation
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