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Climate and Environment

    • Alaska volcano's weeklong eruption eases after spewing another massive ash cloud

    This web camera image provided by the U.S. Geological Survey shows a low-level ash plume from the Shishaldin Volcano captured, July 18, 2023. (Alaska Volcano Observatory/U.S. Geological Survey via AP) This web camera image provided by the U.S. Geological Survey shows a low-level ash plume from the Shishaldin Volcano captured, July 18, 2023. (Alaska Volcano Observatory/U.S. Geological Survey via AP)
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    ANCHORAGE, Alaska -

    An ongoing eruption of a remote volcano in Alaska's Aleutian Islands produced an ash cloud so large Tuesday that warnings were sent to pilots about potentially dangerous conditions.

    An ash cloud with an initial height of around 5.5 miles (8.9 kilometres) was reported following the morning eruption of Shishaldin Volcano. But by early afternoon, ash emissions were below 1.9 miles (3 kilometres), and the aviation alert was downgraded, according to the Alaska Volcano Observatory.

    The volcano is about 700 miles (1,127 kilometres) southwest of Anchorage and sits near the middle of Unimak Island. The island's 65 or so residents live about 25 miles (40 kilometres) northeast of the volcano, in the community of False Pass.

    Shishaldin Volcano began erupting July 11. A U.S. Coast Guard overflight confirmed lava erupted the same day within the summit crater.

    A significant explosion early Friday produced an ash cloud that reached up to 7.5 miles (12 kilometres) and drifted south over the Pacific Ocean. A second smaller explosion occurred later Friday.

    The volcano, one of the most active in the Aleutian arc, saw increased lava eruptions just after midnight Tuesday, with no significant ash emissions, the observatory said. That changed hours later with the ash cloud. The National Weather Service issued an advisory due to the drifting ash cloud.

    Volcanic ash is angular and sharp and has been used as an industrial abrasive. The powdered rock can cause a jet engine to shut down.

    Shishaldin is a symmetric cone with a base diameter of 10 miles (16 kilometres), the observatory said. The 660-foot (210-metre) funnel-shaped crater often emits steam and an occasional amount of ash.

    There have been at least 26 confirmed eruptions at Shishaldin Volcano since 1824. Most are small, but the observatory said a 1999 eruption produced an ash cloud that reached 8.5 miles (14 kilometres).

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