Hawaii's Mauna Loa starts to erupt, sending ash nearby

The eruption began late on Sunday night in the summit caldera of the volcano on the Big Island

Hawaii's Mauna Loa, the world's largest active volcano, has started to erupt, prompting volcanic ash and debris to fall nearby, authorities said on Monday.

The eruption began late on Sunday night in the summit caldera of the volcano on the Big Island, the US Geological Survey said.

Early Monday, it said lava flows were contained within the summit area and weren't threatening nearby communities.

"However, lava flows in the summit region are visible from Kona. There is currently no indication of any migration of the eruption into a rift zone," the Hawaiian Volcano Observatory said in a statement.

A rift zone is where the mountain is splitting apart, the rock is cracked and relatively weak and it's easier for magma to emerge.

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The USGS warned residents at risk from Mauna Loa lava flows should review their eruption preparations. Scientists had been on alert because of a recent spike in earthquakes at the summit of the volcano, which last erupted in 1984.

Portions of the Big Island were under an ashfall advisory issued by the National Weather Service in Honolulu, which said up to a quarter-inch (0.6 centimetres) of ash could accumulate in some areas.

Mauna Loa is one of five volcanoes that together make up the Big Island of Hawaii, which is the southernmost island in the Hawaiian archipelago.

Mauna Loa, rising 13,679 feet (4,169 metres) above sea level, is the much larger neighbour to Kilauea volcano, which erupted in a residential neighbourhood and destroyed 700 homes in 2018.

Some of its slopes are much steeper than Kilauea's so when it erupts, its lava can flow much faster.

During a 1950 eruption, the mountain's lava travelled 15 miles (24 kilometres) to the ocean in less than three hours.

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