Alert level increased at world's largest volcano in Hawaii
Federal officials have raised the alert level for the world's largest active volcano, Hawaii's Mauna Loa.
The U.S. Geological Survey changed the level from normal to advisory on Tuesday after observing an increase in earthquakes and ground swelling at the Big Island volcano over the past several months.
Officials say the increased alert level does not mean an eruption is imminent.
Advisory is the second of four alert level designations after normal and means there are some signs of volcanic activity and low-level unrest.
The next alert level is a watch, which means there is heightened activity with more potential for eruption. A warning means scientists suspect a dangerous eruption is imminent or is underway.
Mauna Loa is neighbor to Kilauea volcano, which ended a 35-year eruptive period last year.
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