Methodology for assessing the state of near-surface sedimentary rocks based on the results of observations of dynamic characteristics of geoacoustic emission

• DOI

The state of surface sedimentary rocks is monitored at the ICIR of the Far Eastern Branch of the Russian Academy
of Sciences based on the results of processing and analysis of the geoacoustic emission signal (GAE). The time variation of the characteristics of the GAE signal, such as the pulse duration and the variety of their amplitude-phase modulation in a sliding time window of different widths, is considered. Previously, a relationship was found between the degree of stress-strain state of sedimentary rocks and the intensity of the pulse flow in the geoacoustic emission signal. At this stage of the research, a probabilistic model of GAE signal formation is presented, which allows us to describe changes in the state of near-surface sedimentary rocks based on the dynamics of amplitude and duration distributions of geoacoustic pulses. Thus, the change in the dynamic characteristics of the GAE signal can be considered as an indicator of the activation of deformation processes at the observation point. The representation of the characteristics of the GAE signal in the form of three-dimensional images of statistical distributions of the amplitude and duration of pulses placed on the graph at set time intervals makes it possible to identify abnormal areas of the signal and classify them. The ultimate goal of the research is to develop methods for analyzing the observed anomalies in the characteristics of the GAE signal in order to detect their connection with the probability of earthquakes. In the future, this will make it possible to link the detected anomalies with certain seismic events, as well as distinguish them from anomalies that occur under the influence of climatic and seasonal factors.

Senkevich Yu. I., Mishchenko M. A. Methodology for assessing the state of near-surface sedimentary rocks based on the results of observations of dynamic characteristics of geoacoustic emission // Vestnik KRAUNTS. Phys.-mat. nauki. 2023. Vol. 45, No. 4. C. 109-121.~--- EDN: UMHNFL.~--- DOI: 10.26117/2079-6641-2023-45-4-109-121.