Abstract
The article describes the results of complex analysis of pre-seismic signals of electromagnetic and geoacoustic radiation. We analyzed the frequency content of single sferics and geoacoustic impulses recorded before the Zhupanov earthquake that occurred on January 30, 2016. The signals were analyzed using sparse approximation method, in particular Adaptive Matched Pursuit. Background signals were studied together with pre-seismic ones. Distributions of frequencies, that are part of background and pre-seismic signals, were compared. Differences in the frequency content of pre-seismic sferics and geoacoustic impulses were found. The revealed features of pre-seismic signals in the future can be used in the design of systems for monitoring, forecasting and prevention of natural disasters. The research was supported by Russian Science Foundation (project No. 18-11-00087).
Highlights
The results of acoustic and electromagnetic field complex studies in the frequency range from 200 Hz to 11 kHz conducted in Kamchatka in 2013 show the presence of simultaneous anomalous bursts in electromagnetic and geoacoustic emission before earthquakes with magnitudes MLH ≥ 5 at epicentral distances up to 200 km [1]
The present work is devoted to the analysis of time- frequency structure of the sferics and the geoacoustic impulses recorded on before the Zhupanov earthquake occurred on January 30, 2016 at 03:25 UTC in Kamchatka
600 pre-seismic and 740 background sferics registered on January 22, 2016, 3095 single geoacoustic impulses recorded on January 29, 2016 during the anomalous bursts of the accumulated acoustic pressure and 4044 geoacoustic impulses registered in the quiet periods on January 22, 2016 were selected for complex analysis
Summary
The results of acoustic and electromagnetic field complex studies in the frequency range from 200 Hz to 11 kHz conducted in Kamchatka in 2013 show the presence of simultaneous anomalous bursts in electromagnetic and geoacoustic emission before earthquakes with magnitudes MLH ≥ 5 at epicentral distances up to 200 km [1]. Geoacoustic signals are observed using piezoceramic receivers located at the bottom of artificial reservoirs [5] Sampling frequency of both types of signals is from 44.1 kHz to 48 kHz. At the current stage of the research, simultaneous anomalies are detected in the integral characteristics of electromagnetic and geoacoustic signals (emission envelopes), not in the “live” data. The present work is devoted to the analysis of time- frequency structure of the sferics and the geoacoustic impulses recorded on before the Zhupanov earthquake occurred on January 30, 2016 at 03:25 UTC in Kamchatka (energy class Ks is 15.7; epicenter coordinates are 53.85° N, 159.03° E; depth is 185 km; epicenter distance is 126 km; azimuth is 30° relative to the “Karymshina” site; information about the earthquake is provided by the KB GS RAS). 600 pre-seismic and 740 background sferics registered on January 22, 2016, 3095 single geoacoustic impulses recorded on January 29, 2016 during the anomalous bursts of the accumulated acoustic pressure and 4044 geoacoustic impulses registered in the quiet periods on January 22, 2016 were selected for complex analysis
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call