HVO reported that during 10-16 October fissure segment D from Kilauea's 21 July fissure eruption continued to feed an advancing lava flow that occasionally overflowed its channel edges. Lava flows advanced NE and along the S margin of earlier flows. Aerial observations on 12 October revealed that the S margin of the flow field was mostly inactive. A few small earthquakes were located beneath Halema'uma'u crater and the S flank during the reporting period.

Geological Summary. Kilauea overlaps the E flank of the massive Mauna Loa shield volcano in the island of Hawaii. 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 Halemaumau 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.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)