Eruptions

New lava lake sighted at Kilauea

Not sure how it was kept quiet for most of the week (well, at least to me), but geologists at the HVO have noticed a new lava lake in Halemaumau Caldera on Kilauea (Hawai’i). The lava lake is around 330 feet (~100 meters) below the crater rim and ~160 feet (50 meters) across with sections of reddish, glowing lava and black crust on the surface. It seems that an explosion on Tuesday helped reveal the lava lake from the surface. The USGS has posted some video of the lava lake for your enjoyment. There are only a few active lava lakes worldwide (such as those at Villarrica in Chile and Erebus in Antarctica), so it is always exciting when a new one forms. The longevity of lava lakes is controlled (partially) by the supply rate of magma to the vent area, so it will be interesting to see how long it lasts.

UPDATE 9/7/2008

Here is the official word on the lava lake from the USGS:

For the first time since the new vent opened in Halema`uma`u Crater on
March 19, HVO scientists in a helicopter hovering over the crater were
able to see the surface of a sloshing 50 m (160 ft) diameter lava lake
about 100 m (330 ft) below the vent rim. HVO scientists have speculated
that a lava pond existed a few hundred meters below the vent, but have not
been able to get visual confirmation until this morning.

A second viewing early this afternoon revealed a roiling pond with
multiple bursting bubbles changing into a central upwelling circulation
pattern. The lake level dropped slightly before the cycle restarted. This
behavior has been witnessed before, most recently in Pu`u `O`o vents and
the July 21 lava ponds on Kilauea’s east rift zone, and is known as ‘gas
pistoning.’ One model explains pistoning as small gas bubbles coalescing
into larger bubbles beneath a crust on a lava pond, rising to the surface,
and then bursting. The released pulse of hot gas carries rock dust from
the collapsing vent walls, bits of the lava lake crust, and small amounts
of spatter.

The Halema`uma`u vent has produced six significant explosive eruptions in
the past 5.5 months, most recently on September 2, 2008 at 8:13 p.m.
H.s.t., during which noteworthy amounts of fresh lava spatter and lithic
material (rock fragments and dust) were ejected on to the crater rim. Just
prior to this event, incandescence from the vent was almost nonexistent
except for brief pulses of glow.

Nearly eight hours later, Kilauea’s summit abruptly inflated, signaling
the end of 39 hours of deflation. Summit deflation-inflation (DI) events
have been observed at least 20 times since the Halema`uma`u vent opened.
Each DI event has been interpreted as the fall and subsequent rise in
magma levels beneath the summit.

Less than 8 hours after inflation started, episodic tremor bursts began
which are visible at night as pulses of bright incandescence every 5-6
minutes.  Episodic tremor bursts have been a nearly constant feature of
the Halema`uma`u vent over the past few months and were one of the early
pieces of evidence pointing toward a gas pistoning source.

This unusually bright incandescence over the past two nights and the
volume of material erupted on September 2 are consistent with a lava
surface at relatively shallow depths beneath the vent. Molten lava is not
directly visible from the Jaggar Museum overlook, but that vantage point
provides excellent views of the glowing vent at night.

Jim Kauahikaua, Scientist-in-Charge
USGS Hawaiian Volcano Observatory

Comments

  1. #1 Hawkeye
    September 7, 2008

    It’s nice to finally see something interesting at the summit again. After the initial explosion and ash plume, the summit activity has pretty much been status quo for several months. I stopped reading the daily updates a couple months ago because it was getting boring.

  2. #2 Alice
    September 14, 2008

    Aloha,

    Last night, Sept 13th, I was up at Halema`uma`u Jaggar Museum overlook with friends. At around 8:30 pm we heard a loud “booom”… but there was not visible sign of anything. There was low cloud making the glow barely visible. The museum & rangers were closed the museum & left. Then at around 9:00pm the clouds lifted & the crater was very clear and we could easily see the lodges lights too. I was noticing the glow though flickering from bright to very dim at intervals. I had never seen this before. Then, there was a very loud suction sound from the hole that echoed throughout the canyon. One woman started running away. Instantly, the glow completely disappeared & was snuffed out! Very little smoke was coming out of the hole & no red glow at all could be seen. For about 20 minutes we waited for it to return but it did not. No ranger was around to report it to…so we left fast just in case it was building pressure & going to explode.

    Can someone tell me what possibly caused this?

    Mahalo!

  3. #3 Erik Klemetti
    September 16, 2008

    That is a great story, Alice! Sounds like you experienced a rapid draining of some part of the magma plumbing system at Halemaumau. This is likely something that could occur often, with lava underground traveling through lava tubes either into the crater or out into the rifts.

    Any Hawai’i volcano experts want to chime in on this one? Have anyone else experienced something like this?

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