3 - 3 Precursory phenomena of phreatic eruption
(Part 2)

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The earthquake swarm started in November, 1989 broadened the hypocenter area to the east. In July of the next year, there occurred 33 earthquakes which can be felt; among them six recorded the seismic intensity of 3. The biggest one was of the magnitude of M4.9 and of the depth of 4 km.

Monthly frequency of earthquakes and movement of their hypocenters

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