## 4 The Search for Interconnection Effect between Cosmic Ray Muons and Seismological Processes  
Forecasting the level of seismic activity and, in particular, dangerous earthquakes, is an urgent problem of modern seismology. An unresolved problem of traditional seismology thus far remains the separation from the stream of information recorded by numerous seismic sensors of a strictly defined signal related to the approach of a specific, localized in time and space, catastrophic earthquake. At the edge of the 1980s and 1990s, scientists from the Institute of Physics named by [PERSON] and the Institute of Physics of the Earth had developed a preliminary concept of a new perspective direction in seismology: the use of a signal from elastic vibrations in the acoustic frequency range for predicting earthquakes, which, presumably, can be generated under the influence of local ionizations, which formed at the time of the passage of penetrating particles of space radiation (high energy muons) through a seismically stressed medium in the deep layers of the Earth's crust [18]. In the work by the authors of [19], a method was proposed for the short-term forecasting of earthquakes, where high-sensitive detectors were used [20; 21; 22; 23]. One of the directions for the development of effective methods for forecasting earthquakes is the study and analysis of the temporal characteristics of high-frequency seismic noise. The paper [24] proposes a method for such a forecast based on the idea that the processes preceding the earthquake cause abnormal behaviour of the intensity of acoustic noise. The role of a trigger provoking the generation of elastic oscillations in the acoustic frequency range can be played by a short-term increase in ionization from the passage of high-energy cosmic ray muons through seismically stressed areas of the lithosphere. The Tien Shan high-altitude station is located in a mountainous area, directly in the zone of deep fractures of the lithosphere, and the system of shower detectors enables one to directly monitor the moments of the passage of powerful EAS and the associated flux of energetic muons. At the initial stage of the development of the acoustic system, a highly sensitive microphone (with a sensitivity of 20 mV/Pa in the acoustic frequency range of 500-10,000 Hz) was installed and has been in operation since the fall of 2017 (Figure 5). The microphone was placed in the well drilled through the rocky soil on the territory of the Tien Shan station at a depth of 52 m below ground level. The distance between the well and the \"Elling\" storm detector system is about 200 m. Acoustic detector signals are recorded in a special building, which is located directly at the upper edge of the well, and in which the main units of the signal-forming equipment are located: a differential amplifier and a low-frequency envelope selector of the microphone's signal. To record the signals of the acoustic detector, a special, low-power, small-sized analogue-to-digital converter (ADC) system has been developed, which was placed together with the analogue signal generation scheme directly at the upper of the well's edge. The basis of the ADC system is a single-board computer Raspberry Pi B + on an ARM microprocessor such as Broadcom BCM2835 with a clock frequency of 700 MHz. The recording of input analogue signals via two information channels of a small-sized ADC system is performed continuously with a period of 2 ms, and the data obtained as a result of measurements are accumulated for subsequent off-line analysis in a file on a local disk, which is connected to the Raspberry Pi B + microcomputer via the built-in USB interface. At the end of the session, the accumulated data is transmitted to the server via Wi-Fi. In Figures 6 and 7, the time point as on 16 November 2017, 01:42:58 UT corresponds to an earthquake with a magnitude of 5.1 and an epicentre at a distance of 130 km from the station location.