Federal officials raised the alert level Tuesday for the world's largest active volcano, Hawaii's Mauna Loa, which last erupted in 1984. The U.S. Geological Survey changed the level from "normal" to "advisory" following a steady increase in earthquakes and ground swelling
HONOLULU — Federal officials raised the alert level Tuesday for the world's largest active volcano, Hawaii's Mauna Loa, which last erupted in 1984.
"Lava can go from the rift down to the ocean on the west side of Mauna Loa on the order of a couple hours," Johanson said."The rate of the eruption is just really fast."Its lava flows have stretched to the south and west coasts eight times and neared Hilo, on the east side, seven times. During its last eruption, lava flows came within 4.5 miles of Hilo, the Big Island's largest city.
An alert-level change is not something the USGS does lightly, said Janet Babb, an agency geologist and spokeswoman. It must balance the need to keep people informed and the risk of causing panic."A lot of discussion goes into it because it has ramifications," Babb said. Story continuesAnd scientists would expect to see 50 to several hundred earthquakes per day — not per week — ahead of an eruption, USGS volcanologist and geologist Frank Trusdell said.
"With the eruption over in east rift zone, maybe the flank will stop," Trusdell said."Then Mauna Loa's flank will buttress up against the immobile Kilauea and the trickle of magma that has been feeding the volcano will build positive pressure and drive an eruption."
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