DRIFTING BUOY HYDROACOUSTIC STATION FOR DETERMINING THE PRECURSORS OF STRONG EARTHQUAKES AND TSUNAMIS IN ICE-COVERED WATER AREAS Russian patent published in 2022 - IPC G01V1/38 

FIELD: measuring.

SUBSTANCE: invention relates to the field of seismology and can be used in national geophysical measurement observation systems for predicting earthquakes. Proposed is a drifting buoy hydroacoustic station for determining the precursors of strong earthquakes and tsunamis in ice-covered water areas, equipped with a vertical string of hydrophones, including an instrumentation module consisting of a sealed cylindrical instrumentation module composed of a control unit, and a power source, a satellite communication and navigation system unit, a control unit, and power sources. The station therein additionally comprises a three-component geophone, a recorder, a digital GPS compass, a tiltmeter, a temperature sensor, and a voltmeter installed on the power source. The analysis unit is configured to detect ultra-low-frequency amplitude modulations of hydroacoustic signals - precursors of strong earthquakes, as well as with select pulse signals by amplitude, repetition frequency, duration, and rate of buildup of the front of seismic waves and T-waves of strong earthquakes. The three-component geophone is therein made with active feedbacks, the analysis unit is made in the form of a recorder operating in the continuous recording mode for detecting a seismic event issuing a message to the control computer about the predetermined threshold being exceeded or recording the results to a "solid-state" memory with a volume of up to 32 gigabytes at preset time intervals ("by the calendar"). The analysis unit also comprises four seismic recording channels with an instantaneous dynamic range greater than 136 dB, a highly stable quartz crystal oscillator with long-term instability of 10^-7 and is configured to be controlled via the built-in "Ethernet 10/100" interface and is made with a range of recorded frequencies of 0.1…240 Hz. Seismic information is converted to the CSS and MiniSEED formats.

EFFECT: increase in the reliability and accuracy of recording seismic signals in the seas of the Arctic basin.

7 cl