Report on Kilauea (United States) — January 1995
Bulletin of the Global Volcanism Network, vol. 20, no. 1 (January 1995)
Managing Editor: Richard Wunderman.
Kilauea (United States) Lava flows active on coastal plain and at ocean entries
Please cite this report as:
Global Volcanism Program, 1995. Report on Kilauea (United States) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 20:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199501-332010.
19.421°N, 155.287°W; summit elev. 1222 m
All times are local (unless otherwise noted)
"Two large lava flows were active on the coastal plain throughout January (figure 96). These flows broke out of the active tube system on Pulama pali, on 1 December. Both flows reached the coastal plain in December, and the E flow entered the ocean on 20 December. Throughout January, the E flow entered the ocean from multiple points along a kilometer-wide front, never really consolidating into a tube entry. The W flow did not enter the ocean until 7 January, and the entries were active intermittently, eventually stagnating altogether by late January. The W flow, despite not entering the ocean, continued to be very active throughout January. There were multiple small breakouts active on this flow below Paliuli. The flow also inflated dramatically during this time, forming a prominent tumuli field. In contrast, the E flow had many large sheet flows active on the coastal plain with moderate inflation. Multiple aa and pahoehoe flows cascaded down Pulama pali during January. There were no changes at the vent area. The lava pond in Pu`u `O`o crater was active and 86 m below the crater rim."
|Figure 96. Kilauea lava flows in the Kamoamoa area since 1982, including flows active during December 1994-February 1995. Courtesy of HVO.|
Eruption tremor levels . . . were steady just slightly above background. The number of LPC-A (shallow long-period, 3-5 Hz) microearthquakes was moderate to high during 12-18 Jan; low-level amplitudes persisted throughout, with minor fluctuation. Daily counts of microearthquake activity remained low beneath the summit and rift zones except for the LPC-A category, with only a very small number large enough to process for location.
Geologic Background. 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.
Information Contacts: T. Mattox and P. Okubo, HVO.