A volcano in Russia’s Kamchatka Peninsula has erupted for the first time in over 500 years, possibly triggered by last week’s powerful 8.8 magnitude earthquake. The Krasheninnikov Volcano sent ash six kilometers into the air, though no towns are at risk, officials said.

Hours later, a 7.0 quake hit the nearby Kuril Islands, prompting mild tsunami warnings. Experts say more aftershocks are likely, as the region lies in the seismically active Pacific Ring of Fire, according to BBC.