Report on Kilauea (United States) — 17 August-23 August 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
17 August-23 August 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Kilauea (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 17 August-23 August 2005. Smithsonian Institution and US Geological Survey.
19.421°N, 155.287°W; summit elev. 1222 m
All times are local (unless otherwise noted)
During 17-22 August, lava from Kilauea entered the sea at the East Lae`apuki area, and surface lava flows were sometimes visible on the Pulama Pali fault scarp and the coastal flat. By 22 August, surface lava on the W branch of the PKK lava flow was no longer visible. Background volcanic tremor was around normal levels at Kilauea's summit. Volcanic tremor was at moderate levels at Pu`u `O`o. Small periods of inflation and deflation occurred at the volcano during the report period.
Geological Summary. Kilauea, which overlaps the E flank of the massive Mauna Loa shield volcano, has been Hawaii's most active volcano during historical time. Eruptions are prominent in Polynesian legends; written documentation extending back to only 1820 records frequent summit and flank lava flow eruptions that were interspersed with periods of long-term lava lake activity that lasted until 1924 at Halemaumau crater, within the summit caldera. The 3 x 5 km caldera was formed in several stages about 1500 years ago and during the 18th century; eruptions have also originated from the lengthy East and SW rift zones, which extend to the sea on both sides of the volcano. About 90% of the surface of the basaltic shield volcano is formed of lava flows less than about 1100 years old; 70% of the volcano's surface is younger than 600 years. A long-term eruption from the East rift zone that began in 1983 has produced lava flows covering more than 100 km2, destroying nearly 200 houses and adding new coastline to the island.