HVO reported that fissure segment D from Kilauea's 21 July fissure eruption remained active during 8-14 August. The 'a'a flow from segment D advanced 760 m during 8-11 August and overflowed the N side of the channel multiple times during 10-12 August. On 13 August, an extension of the lava flow formed in an area of frequent overflows. Smoke from burning vegetation was visible near the flow front. Fissure segment C produced small lava flows during 8-10 August but only fumes during 11-14 August.

Incandescence was visible on the web camera from E and W vents in Pu'u 'O'o's crater on 11 August. A few small earthquakes were located beneath Halema'uma'u crater, the S flank, and the SW rift zone during 8-13 August. On 13 August, a M 5.4 earthquake was located beneath the S flank at a depth of 9 km.

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)