June 23: Pele’s Latest Trick – Lava Boats (Lavabergs)

Today’s Eruption Summary

Fissure 8 just keeps on going, as if it’s settling in for a Pu’u O’o eruption rather than a 1955/1960 eruption.  Once again, there’s minor overflows upriver that don’t go anywhere. The ocean entry is mostly via the channel on the south side of the lava delta, but there’s also trickles along a kilometer-wide stretch of shore. Fissure 22 showed incandescence but no lava during the USGS morning overflight.

The USGS was skimpy on images today but gave us a treat: a timelapse of what they call “lava boats.”

Here’s their explanation: “Geologists captured this time-lapse video of the perched lava channel issuing from fissure 8 on Kīlauea’s lower East Rift Zone. Rafts of accreted lava move down stream and look like boats moving down a river. These are termed lava balls or lava boats and form when portions of the fissure 8 cone or levees break away and are rafted down stream. As they move along in the channel, additional lava can cool to their surface to form accretionary lava balls.”

After lots of minor earthquakes and rockfalls that sent up small plumes of dust, the daily summit “collapse explosion” occurred at 4:34pm. It sent up a 2000-foot plume, once again equivalent to 5.3 earthquake. Again, I couldn’t resist a video capture:

The runup to today’s explosion was impressive. There was one cascade of dust and rubble all the way around the walls that I would’ve taken for the day’s explosive event, except that there was no camera shake beforehand. Doubtless it was one of these:

There’s not much news today, so let’s hitch a ride with the Hawaii County Fire Department and follow the lava river to the ocean. But first….

USGS: “On June 23, 2018 at 4:32 p.m. HST after approximately 17 hours of elevated seismicity, a collapse explosion occurred at the summit if Kīlauea. The energy released by the event was equivalent to a magnitude 5.3 earthquake. During the intense shaking, rockfalls cascaded down the northern margin of the caldera wall just below Uwēkahuna Bluff sending rock dust into the air.” (Full-sized)
More on Lava Boats

I’d asked about the “lava boats” before that video was posted: “What’s forming those so-called “lava bergs”? Are they chunks off the sides of the levees? Do they indicate erosion/undermining of lava channel’s banks analogous to meanders of an H20 river, with risk of wearing through?”

@USGSVolcanoes offered some additional info in response:  “They are chunks of the sides of levees as well as bits of the cone. As lava moves by them in the channel, they can be coated, dislodged, etc. Different than water – lava cools against cooler surfaces (channel sides) & we’ve started to see portions roofing over (forming tubes).” And when someone else asked if the whole 8 mile channel might become a lava tube: “It’s a possibility, but not necessarily guaranteed. It’s easier in places where the channel is already narrow.”

Which doesn’t answer my question about erosion/meanders, but looking back, they answered another question about braided lava channels on June 11 with this paper, which emphasizes that viscosity is a major factor in lava flows, whereas in H2O it’s particles in water.

Someone else’s Q on “lava boats”: ” Are these what’s floating beyond the ocean entry?
USGS: That’s a different process. The chunks floating beyond the ocean entry are bits of very bubble-rich lava-rock. When lava enters the sea there is sometimes an explosive process that expels rocks – the heat of the rock combined with the amount of bubbles causes these pieces to float for a while. Eventually, they cool, fill with water, and sink. 

  • Awkward place to stick this, but so I don’t forget: this week’s HVO “Volcano Watch” newsletter focused on “Mauna Loa Back to Normal.
More USGS on Social Media

Q: What will happen if the summit collapse continues?
USGS: There are several options: It could enlarge to a point and then the explosive activity could stop, or it could enlarge the crater and the explosions could change character.

Aha! It turns out the USGS posted photos today only on Facebook. Someday when things calm down, they need to comb their social media channels and make sure they’ve archived everything on the HVO website and/or USGS media library.

USGS: “Fissure 8 fountain, as observed from the Leilani Estates subdivision. USGS-HVO crews noted that during the overnight hours, the lava fountain typically reached heights similar to the height of the cinder cone, with sporadic bursts sending lava higher than the cone (as pictured in this image).
USGS image taken June 23, 2018, around 12:46 AM.” (Full-sized)
USGS: “HVO field crews are on site in the lower East Rift Zone, tracking the fountains, lava flows, and spattering from Fissure 8 as conditions allow and are reporting information to Hawaii County Civil Defense. Crews also make measurements and observations of ground cracks in the area, as shown in this image taken near fissure 9.
USGS image taken during the afternoon of June 22, 2018.” (Full-sized)
USGS: “View of the lava channel from ground level, with the Kapoho Crater in the upper left. The active channel is the horizontal silver-colored line in the upper third of the photo. Lava travels about 5 miles per hour in this area.
USGS image taken during the afternoon of June 22, 2018.” (Full-sized)
From Other Scientists

From Fissure 8 to the Sea with HCFD

If the USGS is too busy to post photos, the Hawai’i County Fire Department takes up the slack. (Unlike Facebook, Flickr is Google-able). Today Civil Defense shared their latest photo album, and once again I’m impressed by the definition of the camera they’re using compared to everybody else.

A small sample:

Looking southeast towards the “Y” junction at Pokoihi Rd, Kapoho Rd and 132 (Google Map) with Puna Geothermal Ventures in the background on the left:

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Left and right, as different as night and day:

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

A disagreeable neighbor:

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Looking towards the new lava delta:

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Past the Lava Rooster house (near that mast):

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Past the Cinder Pit:

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Around Kapoho Crater (and former Green Lake):

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

To the sea. (Note upwelling.)

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

New land.

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Effects extend offshore…

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

So far, so lucky. (Note the 1960 lava flow with roads on it.)

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

(warning: helicopter noise)

06/19/18 Kilauea, HI - East Rift Zone Eruption Event

Sorry, got carried away. But there’s another 98 photos/videos in that album, including video all along the route and detailed views of houses, farms, even a dock.

From News Outlets

HNN is taking the weekend off; they’ve more than earned it. (Today they just altered a headline and called it a day: “637 homes destroyed by lava amid explosions, eruptions on the Big Island“) But KHON2 took up the slack:

Moment of Aloha

While we wait for daily explosions, the people living on Kilauea endure earthquake swarms, as Dispatches from Volcano describes today. Also, he waxes eloquent on the topic of naming Fissure 8.

STill More Photography/Videos

First up, Mick Kalber getting up close and personal with whatever it’s called. Good views of a spillover, Fissure 22 incandescence, and the red lava at the ocean entry. (Blog post on this overflight)

Here’s that spillover with streets labeled:

Other pros are still hitching rides with Paradise Helicopters and/or the National Guard:

Fissure #8, new Pu'u 'O'o? (06/21/2018)

A post shared by Janice W. (@janice_weicool) on

A lava sun. A sunset behind gas plume from fissure #8.

A post shared by Janice W. (@janice_weicool) on

(East is left in the Kilauea livecam)