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Saturday, May 11, 2024

Kaʻū News Briefs May 11, 2024

May 22nd, 1924 explosion as seen from Volcano House. Photo by Tai Sing Loo

KĪLAUEA ERUPTED EXPLOSIVELY 100 YEARS AGO THIS WEEK. It was the first time in nearly a century, reports Volcano Watch in its weekly column written by U.S. Geological Survey Hawaiian Volcano Observatory scientists an affiliates:
    The eruption lasted for about 17 days, killing one person and injuring others. Learn more about the 1924 eruption.
    The eruption took place from Halemaʻumaʻu at the summit of Kīlauea but was foreshadowed by a seismic crisis and intrusion of magma in lower Puna, 30 miles (50 km) away. In February 1924, the lava lake in Halemaʻumaʻu began to drain back underground. In mid-April, lower Puna was shaking almost constantly, and the ground was cracking open as lava from the emptying lake traveled underground into the lower East Rift Zone. The crisis died by April 28 before lava could erupt, and agricultural field hands that had been evacuated resumed their work.
    At Kīlauea’s summit, the floor of Halemaʻumaʻu began dropping on or before April 29 and was lower by 328 ft (100 m) on May 7, the last measurement date. Rock falls from the crater wall generated thick dust clouds. Red-hot “ʻaʻā paste” left over from the drained lava lake
Explosive eruption column from Halema‘uma‘u Crater 11:15 a.m. May 18, 1924 -
one of many in a series of similar events during May 11-27. Photo from northwest
rim of Kīlauea summit. Photo by K Maehara
peeled away from the wall, but observers noted no wholesale collapse.
    The first explosion was unobserved during the night of May 10–11 and ejected blocks weighing more than 330 pounds (150 kg) as far as 200 ft (60 m) from the crater. After relative calm on May 11–12, the eruption took off in earnest on May 13. Thereafter, more than 50 distinct explosions occurred until May 27, when the eruption ended.
    Thousands of rocks were tossed high in the air, littering the caldera floor. Intense electrical storms accompanied some of the explosions, and lightning took out powerlines far down the road to Hilo. Earthquakes shook the ground, and mud rains with pellets the size of peas (called accretionary lapilli) pummeled the summit. Blocks weighing several tons landed more than half a mile (1 km) from the crater; one 8-ton block that landed about a mile (2 km) southeast of the crater became a signed visitor site for many years, even surviving the caldera collapse of 2018.
    The explosive crescendo was on Sunday, May 18, when the two largest explosions occurred. A number of observers were on the caldera floor during the first, and one, Truman Taylor, was fatally injured by a falling rock. By remarkable coincidence, 56 years later the devastating eruption of Mount Saint Helens occurred on Sunday, May 18, 1980, and both eruptions killed a man named Truman. Truth is sometimes stranger than fiction.
    Most of the ash from the explosions was blown southwestward by the trade wind, but some, perhaps supplied by higher eruption columns that overtopped the trade wind regime, fell from South Hilo to lower Puna. Railroad travel in Makuʻu was disrupted when the tracks became slippery from wet ash. Rain washed ash from the roof of the Glenwood store, tearing off the gutters. Overall, though, the production of ash was modest, and, after only 20 years, it was hard to find ash deposits outside the caldera, as wind and water swept them away.
View looks away from Halema‘uma‘u, in the direction the block was falling. Left to
 right: Oliver Emerson, Tai Sing Loo (in crater, holding camera), John Stokes.
Photo taken 9:30 a.m. May 22, 1924. Photo by H.T. Stearns
    During the eruption, Halemaʻumaʻu doubled its diameter to about half a mile (1 km), and its floor dropped more than 1640 ft (500 m).
    What powered the explosions? For years the interpretation was that they resulted from steam explosions generated as groundwater encountered hot rock. This interpretation, suggested at the time, served well until the 2018 collapse of Halemaʻumaʻu and the adjacent caldera produced nothing comparable to the 1924 explosions.
    Theoretical modeling indicates that months to years are required for the conduit wall to cool enough for groundwater to return after draining of a lava lake. Is there any way to overcome this theoretical requirement? What role did magmatic gas—dissolved in magma and released explosively by sudden drop in pressure—play in 1924 or in 2018? Ongoing work by USGS Hawaiian Volcano Observatory (HVO) researchers on the 1924 ash is providing new information bearing on these questions. Next week’s “Volcano Watch” article will describe this research.
    Finally, a sad, deeply personal, note. Thomas Jaggar, esteemed head of HVO, was in New York when the eruption started, not returning home to Hawaii until May 28. In a private letter written 23 years later, he lamented "...1924 was my responsibility, and my absence was a pity, the most fatal disappointment of my life."
    On Tuesday, May 14 at 7 p.m., join Don Swanson, HVO geologist emeritus, and Ben Gaddis, HVO volunteer, as they describe the 1924 explosive eruption of Kīlauea in an After Dark in the Park presentation at Hawai‘i Volcanoes National Park. Park entrance fees apply. See here for more information: https://www.nps.gov/havo/learn/news/20240329_may-2024-events.htm. This program will be repeated on May 20 and 21 at Lyman Museum in Hilo. See here for more information: https://lymanmuseum.org/events/.

 To read comments, add your own, and like this story, see facebook.com/kaucalendar. See upcoming events, print edition and archive at kaunews.com. Support this news service with advertising at kaunews.com. 7,500 copies the mail and on stands.

VOLCANO ACTIVITY UPDATES FROM USGS: Kīlauea is not erupting. Its USGS Volcano Alert level is ADVISORY.  Unrest that began on April 27 continues beneath the upper East Rift Zone and the summit caldera south of Halemaʻumaʻu. Up to 280 events, most magnitude-2 and smaller, have been detected per day over the past week between the south part of Kīlauea caldera and the intersection with Hilina Pali Road; depths remain concentrated between 2-4 km (1.2-3.1 miles) beneath the surface. Tiltmeters near Sand Hill and Uēkahuna bluff continued to record inflationary trends. Kīlauea's summit region is pressurized, and changes could occur quickly moving forward. See the Information Statement published on May 2 for background information: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-HVO-2024-05-03T07:42:02+00:00.
    Mauna Loa is not erupting. Its USGS Volcano Alert Level is at NORMAL.
    Webcams show no signs of activity on Mauna Loa. Summit seismicity has remained at low levels over the past month. Ground deformation indicates continuing slow inflation as magma replenishes the reservoir system following the 2022 eruption. SO2 emission rates are at background levels.
    Six earthquakes were reported felt in the Hawaiian Islands during the past week: a M3.3 earthquake 6
Thomas Jaggar standing amid ash and blocks of the May 1924 eruption,
looking east-northeast toward Kīlauea Iki. Note the fresh cracks that opened
 as Halema‘uma‘u was widening during its collapse. Photo by Tai Sing Loo

km (3 mi) S of Volcano at 1 km (1 mi) depth on May 7 at 9:26 a.m. HST, a M1.9 earthquake 6 km (3 mi) SSW of Honoka‘a at 6 km (3 mi) depth on May 6 at 9:11 p.m. HST, a M2.5 earthquake 5 km (3 mi) SSW of Volcano at 1 km (1 mi) depth on May 2 at 4:16 p.m. HST, a M3.1 earthquake 6 km (3 mi) S of Volcano at 1 km (0 mi) depth on May 2 at 4:07 p.m. HST, a M3.0 earthquake 6 km (3 mi) S of Volcano at 0 km (0 mi) depth on May 2 at 3:56 p.m. HST, and a M2.9 earthquake 6 km (3 mi) S of Volcano at 1 km (0 mi) depth on May 2 at 3:48 p.m. HST.
    HVO continues to closely monitor Kīlauea and Mauna Loa.
    Visit HVO’s website for past Volcano Watch articles, Kīlauea and Mauna Loa updates, volcano photos, maps, recent earthquake information, and more. Email questions to askHVO@usgs.gov.

To read comments, add your own, and like this story, see facebook.com/kaucalendar. See upcoming events, print edition and archive at kaunews.com. Support this news service with advertising at kaunews.com. 7,500 copies the mail and on stands.

SEVERE AND EXTREME (G4-G5) GEOMAGNETIC STORMS LIKELY ON 12 MAY 2024, according to NOAA, which reported, "Another series of CMEs associated with flare activity from Region 3664 over the past several days are expected to merge and arrive at Earth by midday (UTC) on 12 May. Periods of G4-G5 (Severe-Extreme) geomagnetic storms are likely to follow the arrival of these CMEs."
    None of the colorful skies seen on the continent and in Europe have reached Hawai'i to date.

VOLCANO WINERY'S MOTHER'S DAY MARKET is Sunday, May 12 from 12 p.m. - 4 p.m. at Volcano Winery, 35 Piʻi Mauna Drive, Volcano. Featuring wine, crafts, food and more. More information at https://m.facebook.com/volcanowinery/.

MOTHER'S DAY CONCERT: FEATURING THE VOLCANO CHAMBER PLAYERS is Sunday, May 12 from 4 p.m. - 6 p.m. at Volcano Art Center's Dietrich Varez Hall in Hawai'i Volcanoes National Park. The concert is a special tribute to mothers. Beverages and pupu will be available for purchase. Tickets available at https://volcanoartcenter.org/classes-and-workshops/purchase-tickets-to-vac-events/.