The results of monitoring the subsoil radon volumetric activity (RVA) at two points on the Kamchatka Peninsula for the period 2000–2021 are presented. Shown that the RVA dynamics reflects the preparation of earthquakes in the northwestern framing of the Pacific Ocean with a magnitude of MW>7.5 and a source depth H<200 km. The earthquake precursors as increase trends in RVA with a duration from 8 months to 3 years have been identified. In the last 5 years, the behavior of the RVA dynamics indicates a high probability of an earthquake with MW>7.5 in.the Pacific Ocean near the eastern coast of the Kamchatka Peninsula. An earthquake can occur before December 01, 2021 and cause a shaking in the city of Petropavlovsk-Kamchatsky with an intensity of more than 7 points.

Topics
Earthquakes, Oceans, Chemical elements
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