Report on Kilauea (United States) — 1 May-7 May 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
1 May-7 May 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Kilauea (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 1 May-7 May 2013. Smithsonian Institution and US Geological Survey.
19.421°N, 155.287°W; summit elev. 1222 m
All times are local (unless otherwise noted)
During 1-7 May HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas.
At Pu'u 'O'o Crater, glow emanated from three spatter cones and a small lava pond on the E part of the crater floor. Small lava flows issued from the N spatter cone on 1 May and from the SW cone on 2 May. The lava pond overflowed during 3-4 and 6-7 May.
Peace Day activity, fed by lava tubes extending from Pu'u 'O'o, consisted of lava flows active above the pali SE of Pu'u 'O'o, on the pali, and on the coastal plain. Lava also entered the ocean in at least two locations spanning the National Park boundary. On 3 May a breakout on the top of the pali produced a lava flow that traveled down to the coastal plain in about 1 hour. Branches from the flow advanced during 4-6 May.
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.