Scientists Say Mauna Loa Volcano May Soon Erupt KAILUA-KONA, Hawaii (AP) -- Earthquakes have been rumbling more frequently deep beneath Mauna Loa, suggesting that the world's largest volcano is getting ready to erupt for the first time in 20 years, scientists said.    "We don't believe an eruption is right around the corner, but every day that goes by is one day closer to that event," said Paul Okubo, a seismologist at the Hawaiian Volcano Observatory on the Big Island...