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The "Pu`u `O`o" eruption of Kilauea's East Rift Zone

Happy 35th Birthday to Pu`u `O`o on 3 Jan 2018!
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puu oo cone in eruption
One Fine Daybreak at the Pu`u `O`o cone in 1997

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26 Oct 2014 update from HVO

Activity Summary: Kīlauea continued to erupt at its summit and within the East Rift Zone, and gas emissions remained elevated. Currently, the June 27th flow has traversed the Pāhoa cemetery between Apa`a St/Cemetery Rd and Pāhoa Village Road and is continuing downslope. The leading edge of the flow has been advancing at rates varying between 9 and 15 m/hr (10 to 16 yd/hr) during the past 24 hours. The flow front has spread out since yesterday afternoon and is roughly estimated to be about 150 yd wide at 9AM this morning. It is currently about 760 m (0.5 mi) straight-line distance from Pāhoa Village Road and 1.4 km (0.9 mi) from Hwy 130.

June 27th Lava Flow Observations: HVO scientists monitored the leading portions of the June 27th flow on the ground yesterday. The narrow lobe that had been moving rapidly downslope reached Apaʻa St/Cemetery Rd near the driveway to the Pāhoa cemetery at 03:20 yesterday morning and finished crossing it at 03:50.

As of yesterday afternoon, this flow is the only area of the flow front that is advancing downslope. The rate of advance was varying between 10 and 15 m/hr (11-16 yd/hr) yesterday. The front moved 140 m (150 yd) from 5pm yesterday to 9am this morning, a rate of 9 m/hr. There appears to be an area of slightly steeper slope just below the cemetery and higher advance rates are possible if the flow reaches that point. The flow front was about 40 m (45 yd) wide at 5pm Saturday, but spread out in the relatively flat terrain near the cemetery and is roughly estimated to be (150 yd) wide presently.

The flow was deflected away from the steepest-descent line it had been generally following, and toward the cemetery, by an old man-made cane-field berm just above Apaʻa Street. The flow is now advancing downslope between two intersecting steepest-descent paths and will likely return to the original steepest-descent path about 300 m (330 yd) upslope from Pāhoa Village Rd (see map ).

Scientists are currently monitoring the flow front


3 Jan 2013 update from HVO

This is an excerpt of a report on the status of Kilauea volcanic activity (available at http://hvo.wr.usgs.gov/activity/kilaueastatus.php).

Activity Summary: The eruption is 30 years old today with only a modest slowdown in activity. Kilauea continued to erupt at two locations: At the summit, DI ('deflation-inflation') deflation and descent of the lava lake surface continued. At Pu`u `O`o crater, glow was visible from the usual sources. To the southeast of Pu`u `O`o, a lava flow was active on the coastal plain and was entering the ocean at several locations along the flow front. Seismic tremor levels were low and gas emissions were elevated.

Recent Observations at Kilauea summit: The summit tiltmeter network continued recording DI deflation totaling almost 5 microradians by this morning. The lava lake surface rose and fell (rise/fall events) during most of yesterday before resuming its descent early this morning. Because of the low lava level, veneer on the walls of the conduit started peeling off and falling into the lake with the first big chunk falling in around 6 am yesterday and several smaller pieces joining it in the lake during the day. The most recent (preliminary) sulfur dioxide emission rate measurement was 400 tonnes/day on January 2, 2013; the relatively low emissions measured yesterday were typical of the reduced emissions observed during rise/fall events. A very small amount of ash-sized tephra (mostly fresh spatter bits and Pele's hair) was carried out of the vent in the gas plume and deposited on nearby surfaces.

Background: The summit lava lake is deep within an ~160 m (520 ft) diameter cylindrical vent with nearly vertical sides inset within the east wall and floor of Halema`uma`u Crater. Its level has varied from about 25 m to more than 200 m (out of sight) below the floor of Halema`uma`u Crater. The vent has been mostly active since opening with a small explosive event on March 19, 2008. The surface level of the lava lake has remained below the inner ledge (~31 m or 100 ft below the floor of Halema`uma`u Crater on October 29, 2012) and has not risen above and flooded the ledge since October 28, 2012. The lake level responds to summit tilt changes with the lake receding during deflation and rising during inflation.

Recent Observations at the middle east rift zone vents: There was an apparent decrease in activity on the coastal plain. An approximately 1 km-wide (0.6 mi wide) lava flow remained active on the coastal plain with scattered surface activity extending from mid-coastal plain to the coast and straddling the easternmost boundary of Hawai`i Volcanoes National Park; activity levels appeared to decrease over the past 24 hours, possibly due to the ongoing DI deflation. Webcams recorded weak ocean entry plumes yesterday and this morning suggesting that lava was sporadically entering the ocean at multiple locations.

Background: The eruption in Kilauea's middle east rift zone started with a fissure eruption on January 3, 1983, and continued with few interruptions at Pu`u `O`o Cone, or temporarily from vents within a few kilometers to the east or west. A fissure eruption on the upper east flank of Pu`u `O`o Cone on Sept. 21, 2011, drained the lava lakes and fed a lava flow that advanced southeast through the abandoned Royal Gardens subdivision to the ocean within Hawai`i Volcanoes National Park in early December 2011. Since late December 2011, the flows have remained intermittently active on the pali and the coastal plain and finally re-entered the ocean starting on November 24, 2012. In general, activity waxes with inflation and wanes with deflation.


Eruption returns to Puu Oo crater after earlier floor collapse and new fissure eruption at Napau Crater (March 2011)

    HVO reported that at 10:09 a.m. HST March 26, 2011, lava returned to the Puu Oo crater after a 17-day hiatus in activity there. The return was accompanied by a brief burst of seismic tremor and a short (1 hr long) sequence of deflation followed by inflation.
    6 March 2011: The floor of Puu Oo crater collapsed spectacularly in the past few days and a new fissure eruption opened up in Napau Crater. This sequence of activity is reminiscent of 1997, when the Puu Oo cone became temporarily inactive and a fissure eruption opened up 2 km away, at Napau. The reduced and cropped images at left are from HVO website
fissure eruption crater floor collapse

The sequence of events are described here, condensced from the the HVO press release:

  • At 1:42 p.m. HST (5 Mar 2011), the USGS HVO monitoring network detected rapid deflation at Pu'u 'O'o and increased tremor along Kilauea's middle east rift zone.
  • At 2:00 p.m., Kilauea's summit also began to deflate.
  • From 2:16 to 2:21 p.m., the floor of the Pu'u 'O'o crater began to collapse, and within 10 minutes, incandescent ring fractures opened on the crater floor a few tens of meters away from the crater wall. As the floor continued to drop, lava appeared in the center of the crater floor, the northeast spatter cone within Pu'u 'O'o collapsed, and an obvious scarp developed on the west side of the crater floor, with lava cascading over the scarp toward the center of the crater.
  • At 2:41 p.m., the scarp on the west side of the crater floor appeared to disintegrate, exposing incandescent rubble. Five minutes later, the collapse of a large block along the east crater wall produced a dust plume.
  • Webcam images showed that the Pu'u 'O'o crater floor continued to drop through 4:26 p.m.
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    Wall collapse at Lava lake at Kilauea Summit (Halemaumau) (March 2011)    
    things have been heating up again at Halemaumau with a roiling lava lake in the active pit. Check out the action from the HVO web cam

    explosive eruption rocks Halemaumau in 2008    
    HVO reported that a small explosion occurred at the Kilauea summit in the very early hours of March 19, 2008, making this the first explosion there since 1924. Lava was not erupted during the gas explosion, but lithic blocks were scattered over a 75 acre region in an often visited part of Hawai'i Volcanoes National Park. A 20-30 m wide crater was formed in the explosion, in the same area where intense sulfur dioxide gas venting has been occuring lately, with incandescent (hot) rocks has been occuring over the past week or so. The largest piece of material ejected in the explosion is believed to measure about a cubic meter. The HVO webvsite has additional information, photos, and a newly installed Halemaumau webcam for your reading and viewing pleasure.

    Earlier Updates: A detailed chronological summary of events during 'episode 55' (1997-2005) of the Pu`u `O`o eruption can be found on the episode 55 page.
    PLEASE NOTE: HCV had been posting detailed eruption updates in the 1990s before web capability was established at HVO on the Big Island. HCV discontinued these detailed updates in late 1999 The latest updates can be now obtained from the Kilauea Update page of the USGS-HVO website

    Visit our LISTING of Pu`u `O`o eruption episodes for a summary of previous activity and links to previous eruption update pages (where available).
    This synopsis was written by Ken Rubin using information provided by the U.S.Geological Survey's Hawaii Volcano Observatory (in the form of formal press releases, personal communications and information from their HVO web site). The US Geological Survey-Hawaiian Volcano Observatory is not directly responsible for editorial changes or enhancements made by the HCV (the Hawaii Center for Volcanology) web staff, nor does it claim responsiblity in any way for the interpretive content of these pages.


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    Last page update on 7 Jan 2018