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.
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