. In the following years, Klyuchevskoy experiences intermittent periods of quiescence
and eruption. Note that the seismicity variations in Fig. 2E correlate
with eruptive periods at Kluchevskoy. In particular, gaps in deep seismicity
between 23 and 33 km depth correspond to the periods of the
volcanic activity. There is evidence that these gaps are real and not
due to noisy periods of data that might limit the ability to record earthquakes
in this depth range