Abstract
We present the results of complex lithospheric-atmospheric investigations of acoustic emission in a seismically active region (Kamchatka peninsula). A laser strainmeter-interferometer, a geophone, a wide-band acoustic system and a microbarometer, installed at Karymshina site (IKIR FEB RAS), are used in the monitoring. Rock deformation, acoustic emission in the near-surface rocks and in the atmosphere by the ground surface are under the consideration. Moreover, we suggest a method to detect acoustic signals recorded simultaneously in the near-surface rocks and in the atmosphere by the ground surface. The method consists in filtration of acoustic signals from the sensors at different frequency sub-ranges from fractions to the first hundreds of hertz followed by detection and accumulation of on 1-second interval. We analyze the data from September 2016 to December 2020. Examples of records of simultaneous acoustic signals in rocks and in the atmosphere are illustrated. The investigation is topical for the construction of a model of lithosphere-atmosphere interaction in a seismically active region.
Highlights
At the present time, one the most important directions in Geophysics is the construction of models for lithosphere-atmosphere-ionosphere-magnetosphere interaction
In the course of the investigations it was shown that P and S waves from earthquakes enter the atmosphere and are recorded over the ground surface [21]. It was shown in the paper [22] that during deformation disturbances in rocks with relative deformations of 10−5 − 10−7, geoacoustic signals of pulse nature with the frequency of units-tens of Hz occur at the observation site
To record low-frequency geoacoustic signals at the measurement point of ground surface deformations, a three-component piezoceramic geophone is mounted on the streinmeter optical bench end surface [24]
Summary
One the most important directions in Geophysics is the construction of models for lithosphere-atmosphere-ionosphere-magnetosphere interaction. In the course of the investigations it was shown that P and S waves from earthquakes enter the atmosphere and are recorded over the ground surface [21] It was shown in the paper [22] that during deformation disturbances in rocks with relative deformations of 10−5 − 10−7, geoacoustic signals of pulse nature with the frequency of units-tens of Hz occur at the observation site. They may pass the earth-atmosphere boundary and be recorded in the air by the ground surface. In this paper we investigate occurrences of such signals over a long time period from September 2016 to December 2020
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