Report on Kilauea (United States) — 3 October-9 October 2018
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 3 October-9 October 2018
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2018. Report on Kilauea (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 3 October-9 October 2018. Smithsonian Institution and US Geological Survey.
19.421°N, 155.287°W; summit elev. 1222 m
All times are local (unless otherwise noted)
On 5 October HVO reported that lava at Kilauea had not been active at the surface for 30 days. Seismicity was low, steady, relatively low rates of deformation across the volcano were recorded, and the summit and East Rift Zone (ERZ) produced only minor gas emissions. These data indicated that near-term resumption of activity at the summit or at the lower ERZ was unlikely; the Volcano Alert Level was lowered to Advisory and the Aviation Color Code was lowered to Yellow.
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.