Volcanoes are rumbling in both the Arctic and the tropics of North America, while other eruptions continue on an Italian island and in the frozen tundra of Russia.

In Alaska, twin volcanoes threaten to unleash more of their fury. Volcano fanatics are salivating over images of Pavlof volcano’s ash and steam plume. The plume rose to approximately 20,000 above sea level and have created a diffuse plume trailing 100 miles downwind to the northeast, according to the U.S. Geological Survey’s Alaska Volcano Observatory. Pilots recently spotted lava trickling down the northwest flank of the 8,261 feet (2,518 meter) volcano. Residents of Cold Bay, 37 miles away, reported  a visible glow from the volcano’s summit last night.

Nearby Cleveland volcano hasn’t erupted yet, and USGS monitoring equipment hadn’t picked up any explosions as of yesterday evening. However, the USGS warns that an eruption of blocks of stone and ash could occur with little or no warning.

USGS officials warned aviators of the dangers of the incipient eruptions and set aviation alert level to “orange.”

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Thousands of miles to the south, the one of the world’s most active volcanoes, Popocatepetl, continues its activity in the Valley of Mexico. On Monday, the volcano erupted a plume of ash that settled over nearby Puebla.

Mexico’s National Disaster Prevention Center announced that they had detected two explosions on Tuesday night. The center also stated that steam recently rose approximately one mile (1.5 kilometers) above  Popocatepetl. Authorities are now preparing shelters and evacuations routes in case the volcanic eruption escalates, reported the AP.

Earlier in May, a tremor from Popocatepetl lasted for 3.5 hours, reported Volcano Discovery. An eruption of steam and ash accompanied the tremor and covered the villages San Juan Tianguismanalco, San Pedro Benito Juárez and the City of Puebla in ash as the plume drifted to the southeast.

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Elsewhere around the world, Stromboli volcano remains active in Italy. Observers spotted a small flow of lava from the volcano’s northeast crater, reported Volcano Discovery. Stromboli is one of the eight Aeolian Islands located north of Sicily.

In Kamchatka, a region of eastern Russia, the volcano Shiveluch produced an ash cloud that rose 15,000 feet (4.7 meters) on Wednesday, according to Volcano Discovery. The five other active volcanoes in Kanchatka have shown no changes in activity recently.

IMAGE: Pavlof Volcano in eruption. View is from the southwest in Cold Bay. Lava fountain is visible near the summit, and steam and ash clouds rise from the northwest flank where a lava flow advances down the slope. (Rachel Kremer, USGS)