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Report on Kilauea (United States) — 9 July-15 July 2003


Kilauea

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
9 July-15 July 2003
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2003. Report on Kilauea (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 9 July-15 July 2003. Smithsonian Institution and US Geological Survey.

Weekly Report (9 July-15 July 2003)

Kilauea

United States

19.421°N, 155.287°W; summit elev. 1222 m

All times are local (unless otherwise noted)


During 12-15 July at Kilauea, surface lava flows were occasionally visible on the coastal flat and upslope on the Pulama pali fault scarp and Paliuli. Seismicity continued at moderate levels at Kilauea's summit, with small low-frequency earthquakes persisting at shallow depths at a rate of about 1-2 per minute. Volcanic tremor at Pu`u `O`o remained at moderate-to-high levels, as is the norm recently. Small periods of inflation and deflation occurred during the report week.

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)