The observatory said its scientists were trying to forecast the eruption "and prevent possible panic". Local authorities, UN agencies and NGOs would be informed, it said.
Seismic stations at Luboga, Katale and Kunene have been observing the activity. The observatory reported that a spasmodic tremor had been observed on 19 and 23 February with "a strong quake" located in the crater.
Mt Nyamuragira erupted in 2001 without causing casualties. However, the nearby Mt Nyiragongo erupted on 17 January 2002, causing up to 350,000 people to flee Goma.
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