Udina (Kamchatka, Russia): A recent paper has brought to attention a long-term increase in seismicity under this long-dormant volcano (it is unknown when it last erupted), attributed to new magma intruding into the re-activated plumbing system. The unrest began in December 2017 and a temporary seismic network was installed in May-July 2018; over 500 earthquakes were detected, centred in an…
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