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On Hawaii's Big Island, officials are paying close attention to the Mauna Loa volcano, saying it's been in a state of "heightened unrest" since the middle of September.

Mauna Loa is the world's largest active volcano, and the number of summit earthquakes has gone up from 10 to 20 per day to 40 to 50 per day, _The Associated Press_ reports. It's

believed that more earthquakes are happening because of an increase in magma flowing into the volcano's summit reservoir system. An eruption is not imminent, but officials are asking

residents to prepare for a possible event, as lava could reach the houses closest to to the volcano's vents in just a few hours. Mauna Loa last erupted in 1984, and the Big

Island's population has doubled since then. Frank Trusdell, research geologist at the Hawaiian Volcano Observatory, told _AP_ that residents should look at his agency's maps that

show how fast lava may get to their neighborhood. SUBSCRIBE TO THE WEEK Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives. SUBSCRIBE &

SAVE SIGN UP FOR THE WEEK'S FREE NEWSLETTERS From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox. From our morning

news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox. "All you got to do is look up there and see the glow," Trusdell said.

"You grab your stuff, throw it in the car, and drive. Go!" Explore More Hawaii Speed Reads