(CNN) Two of the three main lava channels from the volcanic eruption on Hawaii's Big Island have merged to create only two entry points into the Pacific Ocean, according to USGS scientist Jim Kauahikaua.

Fissure 22 split into two flow lines on Thursday, but came back together later in the day.

Fissure 7 is producing the largest amount of lava, according to USGS volcanologist Wendy Stovall.

Small eruptions are continuing at the summit of Kilauea. An explosion reported Thursday produced an ash plume that rose up to 10,000 feet and "carried slightly more ash" than other recent ones, the USGS said.

Authorities are urging people to stay away from the areas where lava is entering the Pacific.

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