Features of the Earth surface deformations in Kamchatka peninsula and their relation with geoacoustic emission

Abstract

Abstract. The paper presents the results of investigations of deformation process in the near surface sedimentary rocks, which has been carried out in a seismically active region of Kamchatka peninsular since 2007. The peculiarity of the experiments on registration of geodeformations is the application of a laser strainmeter-interferometer constructed according to the Michelson interferometer scheme. Besides rock deformations, geoacoustic emission in the frequency range from several hertz to the first tens of kilohertz is under the investigation. Piezoceramic hydrophones installed in artificial water reservoirs are applied. It is shown that periods of primary rock compression and tension with the duration up to several months are distinguished in the geodeformation process at the observation site. During the direction change in the deformations, when geodeformation process rate grows, the increase of geoacoustic radiation is observed.

Simultaneous lithospheric-atmospheric signals of acoustic emission at “Karymshina” site in Kamchatka

“…The microbarometer ISGM-03M is aimed at converting air pressure variations into electric signal in the operating frequency band from 0.02 to 100 Hz in the amplitude range from 0.001 to 100 Pa. The mode of functioning is based on the measurement of elastic membrane shift relatively a fixed electrode from air pressure variation effect by displacement capacitance sensor [21].…”

“…Initially, 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.…”

Effect of Ultrasonic Treatment on Radon Exhalation from Porous Media: An Experimental Case Study

“…The molding samples (numbered as SPL 1, 2 and 3, respectively) were prepared as cubic shapes with a side length of 150 mm, and a hollow circular cylinder with a diameter of 75 mm was in the middle of two opposite planes of the cubic samples (see Figure 1). The frequency band of acoustic emissions caused by fault creeping or microfracturing before an earthquake is sufficiently wide and contains an ultrasonic vibration with the frequency from a few 10s of kilohertz to 100 kilohertz, as well as acoustic vibrations and seismic waves with lower frequencies [8][9][10]. In the aftershock region of Tangshan, Hebei Province, an ultrasonic signal with the frequency of 40 kHz was recorded [11].…”

“…The frequency band of acoustic emissions caused by fault creeping or microfracturing before an earthquake is sufficiently wide and contains an ultrasonic vibration with the frequency from a few 10s of kilohertz to 100 kilohertz, as well as acoustic vibrations and seismic waves with lower frequencies [8][9][10]. In the aftershock region of Tangshan, Hebei Province, an ultrasonic signal with the frequency of 40 kHz was recorded [11].…”