Analysis of manifestation of joint acoustic and electric responses of near-surface sedimentary rocks on the deformation by earthquake seismic waves in the South of Kamchatka

Abstract

We continue the investigation of earlier discovered joint acoustic and electric responses of near-surface sedimentary rocks on the deformation by earthquake seismic waves. The appearance and absence of this response in earthquakes with the energy class of more than 11.0, which occurred from June 2017 to May 2021 by the eastern coast of Kamchatka in the latitude band of 51.7-54.0° N, are under consideration. From those earthquakes we selected 52 events, the seismic waves of which had rock acoustic response at Karymshina site, IKIR FEB RAS. Occurrences of joint acoustic and electric responses of rocks and manifestations of their low-frequency and high-frequency acoustic responses were analyzed. Applying the nonparametric correlation Spearman analysis, statistically significant relation between the energy class of the earthquakes under consideration and the distance from hypocenter to the observation site was discovered.

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“…Mishchenko and Shevtsov [14] adopted statistical methods to analyze the occurrence of abnormal disturbances in geoacoustic emissions and atmospheric electric fields before earthquakes, revealing relevant laws and trends in earthquake precursor physics, but this approach cannot handle big data. In 2021, Mishchenko et al [15] analyzed the acoustic response of rocks in large earthquake events on the east coast of the Kamchatka Peninsula and discovered the characteristics of low-frequency and high-frequency acoustic responses. They also used Spearman correlation analysis to discover the relationship between earthquake energy and the distance from the earthquake source to the observation site using a statistically significant relationship.…”