Now, Ivan Koulakov, a geophysicist from Russia's A.A. Trofimuk Institute of Petroleum Geology and Geophysics who led a study into the volcano, believes it should be reclassified as active.Between 1999 and September 2017, about 100 weak seismic events were detected beneath the volcano, which stands at 9,590 feet above sea level. An"anomalous increase" in seismicity, however, began in October 2017. Between October 2017 and February 2019, about 2,400 seismic events were recorded.
Installing four temporary seismic monitoring stations around Bolshaya Udina, the researchers recorded and analyzed 559 seismic events. An"elliptical cluster" of seismic activity had formed around the volcano, they determined, with seismic events taking place more than three miles beneath the surface.
Bolshaya Udina shares structural characteristics with another formerly extinct volcano in the region, the Bezymianny, which erupted dramatically in 1956, Koulakov told CNN."Or it could just release the energy smoothly over a few months, or it may just disappear without any eruption," he said.
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