U.S. Geological Survey - Hawaiian Volcano Observatory

Volcano Watch

Volcano Watch is a weekly newsletter written by the scientists at the US Geological Survey's Hawaiian Volcano Observatory. It is published in the Hawaii Tribune-Herald's Sunday newspaper and the West Hawai'i Today's Monday newspaper, and posted here the following Monday or Tuesday. While primarily addressed to the residents of the Big Island of Hawai`i, some articles may have a broader scope. Article topics may range from volcanic features on the Big Island, volcanic hazards, informational topics of Long Valley, Montserrat, or Alaska, to topics about the Hawaiian Volcano Observatory.

Latest Issue:

April 24, 2008: Professor Jaggar would have loved this view

Previous Issue:

April 17, 2008: Unfamiliar Tricks from our Familiar Volcano

Lava from the 2007 Thanksgiving Eve Breakout (TEB) flow, erupting from fissure D of the July 21 eruption, continues to flow through what remains of the Royal Gardens subdivision and across the coastal plain. On Wednesday, March 5, the flow entered the ocean (Waikupanaha entry) in the vicinity of Kapa`ahu. The Waikupanaha delta has since grown to a width of about 1,000 m (3,280 ft) and has multiple entry points. On March 15, another branch of the flow reached the ocean (Ki entry) farther to the east, within a few hundred meters of the lava viewing area. During the past week, lava supply to the Ki entry ceased, though the Waikupanaha entries remain fully active.

The public should be aware that the ocean entry areas could collapse at any time, potentially generating large explosions in the process. The steam clouds rising from the entry areas are highly acidic and laced with glass particles. Do not venture onto the lava deltas. Even the intervening beaches are susceptible to large waves suddenly generated during delta collapse; these beaches should be avoided. Check the County of Hawai`i Civil Defense website (http://www.lavainfo.us) for information on public access to the coastal plain and ocean entry.

The surface flows active last week on TEB shield complex were stalled by Saturday, April 19, and no other surface flows in the shield complex area have been observed this week. Throughout the past week small breakouts from the tube system have been observed in the Royal Gardens subdivision.

No incandescence was observed at night in Pu`u `O`o in the past week, though minor incandescence has been sporadically present throughout the past few months. As in years past, Pu`u `O`o likely is serving as a large chimney, beneath which lava is briefly stored and substantially degassed on its way to the eruption site.

On March 11, a new fumarole appeared low on the southeast wall of Halema`uma`u Crater, within Kilauea's summit caldera. The new vent is located directly beneath the Halema`uma`u Overlook about 70 m (230 ft) down. At 2:58 a.m. on March 19, a small explosion occurred from this fumarole. The explosion scattered rock debris over an area of about 75 acres, covering a narrow section of Crater Rim Drive, the entire Halema`uma`u parking area, and the trail leading to the overlook. The overlook was damaged by rocks that reached up to 90 cm (3 ft) across. No lava was erupted as part of the explosion, suggesting that the activity was driven by hydrothermal or gas sources. On April 9 another small explosion occurred, depositing dense blocks and particles of fresh lava on the overlook area. Last week, another small explosion from the vent occurred at 3:57am on April 16, producing a dusting of pale-red ash west of the crater. The new explosion pit continues to vigorously vent gas and ash, with the plume alternating between brown (ash-rich) and white (ash-poor). Fresh lava spatter, Pele's tears and Pele's hair have been collected at the rim, indicating that magma resides at shallow depths in the new conduit.

Sulfur dioxide (SO₂) emission rates from the summit area have been substantially elevated up to 10 times background values since early January; the emission rates for the past week have been decreasing but are still elevated. The increase in sulfur dioxide emission rates at the summit means that SO₂ concentrations are much more likely to be at hazardous levels for visitor areas downwind of Halema`uma`u, especially during weak wind conditions or when winds blow from the south. Most people are sensitive to sulfur dioxide at these levels, especially children, individuals with asthma, chronic obstructive pulmonary disease (COPD), or other breathing problems. Stay informed about SO₂ concentrations in continuously monitored areas (Jaggar Museum and Kilauea Visitor Center) by visiting the Kilauea Visitor Center and the web at:
http://www2.nature.nps.gov/air/webcams/parks/havoso2alert/havoalert.cfm. To minimize these potentially harmful effects, Hawai`i Volcanoes National Park has closed all access to the southern half of Kilauea caldera.

One earthquake beneath Hawai`i Island was reported felt within the past week. A magnitude-3.3 earthquake occurred at 7:08 p.m., and was located 10 km (6 miles) northwest of Pahala at a depth of 10 km (6 mile).

Mauna Loa is not erupting. One earthquake was located beneath the summit. Extension between locations spanning the summit, indicating inflation, has resumed following a few months of stagnation.

Visit our Web site (http://hvo.wr.usgs.gov) for daily Kilauea eruption updates and nearly real-time Hawai`i earthquake information. Kilauea daily update summaries are also available by phone at (808) 967-8862.

For maps, photographs, and more current information see Kilauea's eruption update page. Visit The Hawaii Center for Volcanology for captivating eruptive photos and a history of the eruption.

The Volcano Watch Archive

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USGS, HVO would like to thank Gerard Fryer at SOEST for doing a great job posting, archiving, and maintaining our Volcano Watch articles on their website from December 30, 1994 through March 6, 1998.