Now, researchers monitoring Mauna Loa reported four earthquake swarms, at shallow depths (above 15 kilometers), in the same places where they were reported in 1984. But it wasn’t just earthquakes that heralded the eruption in 1984 – so there’s no reason to fear yet.
Before the eruption took place, geologists also reported swelling on the surface of the volcano and gas coming out of the volcano’s cracks. None of these has been reported now. No significant ground deformation, no gas emissions – so while there is some pressure building up in the magma chamber, there is no definite indication of an incoming eruption.