During 31 March to 5 April, surface lava flows were visible at the southern part of Kīlauea's rootless-shield complex, which is along the Mother's Day lava tube several hundred meters S of Puʻu ʻŌʻō cone. Incandescence was also visible from several vents in the crater of Puʻu ʻŌʻō. Seismicity was at low levels at Kīlauea's summit, and tremor at Puʻu ʻŌʻō remained moderate. During the report period, there were episodes of inflation and deflation at Uwekahuna and Puʻu ʻŌʻō.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Geological Summary. Kīlauea overlaps the E flank of the massive Mauna Loa shield volcano in the Island of Hawaiʻi. Eruptions are prominent in Polynesian legends; written documentation since 1820 records frequent summit and flank lava flow eruptions interspersed with periods of long-term lava lake activity at Halemaʻumaʻu crater in the summit caldera until 1924. The 3 x 5 km caldera was formed in several stages about 1,500 years ago and during the 18th century; eruptions have also originated from the lengthy East and Southwest rift zones, which extend to the ocean in both directions. About 90% of the surface of the basaltic shield volcano is formed of lava flows less than about 1,100 years old; 70% of the surface is younger than 600 years. The long-term eruption from the East Rift Zone between 1983 and 2018 produced lava flows covering more than 100 km², destroyed hundreds of houses, and added new coastline.