Tag: halema’uma’u

June 18: USGS Kilauea Conference Call

BigIslandVideoNews posted an abridged version of today’s USGS Media Conference Call:

Here’s the full unabridged audio recording.  Below, I take notes/paraphrase, for anyone who’s especially interested in the nitty gritty of what’s going on with the volcano.

June 18 USGS 11AM Media Conference Call

Continue reading June 18: USGS Kilauea Conference Call

June 16: Things Moving Sideways or Down Quite Rapidly

HVO’s Kilauea Summit Livestream caught today’s Halema’uma’u “subsurface explosion” (is that what we’re calling them now?) and — wow!

Halema’uma’u BEFORE: screengrab of USGS/HVO Kilauea Livestream before the day’s explosive event. I’ve boosted the exposure to bring out details. (Jun 16, 2018)

(a few hours later, when, luckily, it was still possible to rewind the livestream back to the time of the explosion, since I missed it.)

Halema’uma’u Crater AFTER: screengrab of USGS/HVO Kilauea Livestream taken later in the day after the dust had settled. Look at that big chunk of the rim that dropped on the right!

We’ve been hearing about subsidence, slumping, and rockfalls for weeks, but there’s nothing quite like seeing it, even if the video’s a bit fuzzy. I took the liberty of saving a clip:

Radar showed the plume was less than 7000 feet, and as usual the energy release checked in at 5.3.

While I rewound the livestream to grab that clip before it fell off the “back” of the livestream conveyor belt, it looks like I jumped right over this:

There was still a column of steam at that spot when I checked an hour later, but I don’t recall it spinning.

Okay, enough fiddling with the livestream. 

What else happened today? Same as the last few days, to the point that I had to double-check the date on today’s HVO  Kilauea status report.  Fissure 8’s cone is holding at 170 feet, fountains currently around 185-200 feet. Fissure 16/18 continues to ooze.

The lava river is running as fast as ever:

Despite the increased vog due to lack of tradewinds, that’s the clearest overflight video I’ve seen in days.

Mick Kalber notes the pahoehoe channel now cuts all the way through the a’a field to the ocean, which may explain recent videos of lava racing at amazing speeds…

Continue reading June 16: Things Moving Sideways or Down Quite Rapidly

June 15: Summit Explosion Captured on Livestream

USGS: “Photograph taken during helicopter overflight captures fissure 8 lava fountain.” This one’s wonderfully moody with subtle textures close up. (Full-sized)

Lava fountains rise and fall, but the river they  feed remains the same: a vigorously-flowing channel down to a wide ocean entry, with occasional small overflows slopping over the levees (banks). Last night, Fissure 8’s fountains were reaching 200 feet; today they dropped again to 100-130 feet with bursts up to 180.  Its cinder cone, built of spatter and tephra falling around the fountains, is now 170 feet tall.

When is somebody going to name this pu’u? 

USGS: “Lava fountains from Fissure 8 reach heights of 200 ft overnight. The cinder and spatter cone that is building around the fissure is now about 165 ft at its highest point. At times, fissure activity is hidden behind the cinder and spatter cone, as shown in this image.” (Full-sized)

Frequency of earthquakes ramped up Thursday night, with more M3s than before. Today’s M5.3 summit explosion was late, finally popping at 11:56am, sending up an ash-poor (?) cloud 10,000 feet. HVO: “It didn’t produce a distinct plume, which is why we say ‘ash and gases’ instead.” This cycle of daily explosive events has been going on since May 26 or 29, depending on how rigidly one defines the pattern.

All right, let’s get to the science. And a rather foggy but nevertheless genuine video clip of one of Halema’uma’u’s daily explosions.

Continue reading June 15: Summit Explosion Captured on Livestream

Changes to Halema’uma’u Crater, Kilauea Summit

Before and after: Halema’uma’u in 1992 & 2018

Left:  November 1992, photo by Winston Brundige*
Right: Screengrab of HVO webcam on June 19, 2018


*used with permission. Thanks, Dad.

Before and after: May vs June 2018

Left: USGS photo from Volcano House, May 19, 2018
Right: USGS photo from Volcano House, June 13, 2018

  • Halemaʻumaʻu before this started: 1 km (0.6 mi) across, 85 m (~280 ft) deep.
  • Halema’uma’u Jun 15, 2018: 1 X 1.3 km (0.6 to 0.8 mi) dimensions, 370 m (1,210 ft) deep.
Radar Images, May 5-June 18

Thanks to the Italian Space Agency for taking a radar satellite image of Kilauea about once a week:

USGS: “May 5 and June 18 at about 6:00 a.m.[…]The last five images in the sequence, from May 29-June 18, show the development of several cracks outside Halema‘uma‘u (also seen in recent UAS footage of the crater) and inward slumping of a large portion of the western, southwestern, and northern crater rim. Much of this motion appears to be coincident with the small explosions from the summit that have taken place on a near daily basis over the past 3 weeks.” (Full-sized)
Yes, HVO and the Jaggar Museum have evacuated, and artwork has been moved to safety.

28 Days At kilauea Summit, May-June 2018
Halema’uma’u Crater, May 24-June 22. Animation of screencaps from USGS/HVO Kilauea Summit wide-angle webcam. (Full-sized)
Views of Halema’uma’u Over the Years

Continue reading Changes to Halema’uma’u Crater, Kilauea Summit

June 14: The Face of Pele

Let me pause my science-blogging for a moment and direct your attention to a very special visitor in yesterday’s Tropical Visions overflight video.

About timestamp 0:30 in June 13 overflight video, Madame Pele’s profile appears in the partly-cooled lava. Mahalo to Tutu Pele, to Mick Kalber for his tireless aerial videography, and to my mother for pointing her out to me. [Although it sounds like Mick took the day off, and I should thank Mick’s co-photographer lavajavadude.]
Respect.

Now, how do I transition from that back to the science side of Kilauea?

Today’s Eruption Summary

Last night and today, Fissure 8’s fountains have rebounded to 200 feet, but the cinder/spatter cone they’ve built is so tall they’re just peeking out:

USGS: “The Fissure 8 viewed from the north at 7:50 AM. The cone is roughly 50 m (165 ft) high at is peak, and a plume of sulfur dioxide and other volcanic gases rises as an orange tinge from the erupting lava fountains (hidden within the cone). Lava is still flowing out of the vent unabated as a full channel. To the left of the cone, a standing wave of lava can be seen in the channel.” (Full-sized)

Fissures 16 and 17 continue to “ooze,” to borrow the USGS’ technical term.

Fissure 8’s lava river remains fast, wide and healthy. It stays incandescent red rather than skimmed over for many miles, which shows just how hot and voluminous it is (26,000 gallons/second). It’s entering the ocean along a dramatically broad front (second half of video clip):

Today’s summit explosion (energy equivalent of M5.3, like clockwork) occurred at 3:19am HST, with an ash plume to 6,000 feet. Again, there were lots of earthquakes in the hours leading up to it, then they dropped off, and now they’re ramping back up to the next explosion. This pattern must be getting pretty old for the nearby residents of Volcano.

After the cut:

USGS info on the ongoing eruption, timelapses of recent changes at the summit, Kilauea-related news, and more stunning photos.

Continue reading June 14: The Face of Pele

June 12: Halema’uma’u’s Collapse Continues

Summit:  Today’s “Type A” explosion occurred at 1:52am. It produced almost no ash this time, although there’s still light ash and SO2 coming out of the crater from time to time. The view of the continued slumping/subsidence of Halema’uma’u crater is impressive (also see Jun 9 video on Twitter):

USGS: “Events at the summit of Kīlauea over the past few weeks have dramatically reshaped Halema‘uma‘u, shown here in this aerial view, which looks west across the crater. The obvious flat surface (photo center) is the former Halema‘uma‘u crater floor, which has subsided at least 100 m (about 300 ft) during the past couple weeks. Ground cracks circumferential to the crater rim can be seen cutting across the parking lot (left) for the former Halema‘uma‘u visitor overlook (closed since 2008). The deepest part of Halema‘uma‘u (foreground) is now about 300 m (1,000 ft) below the crater rim. The Halema‘uma‘u crater rim and walls continue to slump inward and downward with ongoing subsidence at Kīlauea’s summit.” (Full-sized)

Fissure 8’s cluster of vents is erupting up to 160ft today. With the cinder cone that’s built up around them, they’re mostly hidden. It’s entering the ocean today along a broad front. Fissure 16/18 are spattering weakly; this is the “weak activity” reported for the past few days. Apart from that, the Lower East Rift Zone is quiet, although other fissures are still releasing gasses.

The good news is, Fissure 8’s lava flow has built up such high, broad banks that unless it overflows them, it probably won’t cover many more homes or cut off new areas. The bad news is, the lava river could still break its levees, and there’s no guarantee other fissures won’t reactivate. USGS field crews reported a “non-erupting crack” in the Lower East Rift Zone with “temperatures as high as 430°C (806°F).”

Note, however, high temps may not indicate imminent changes. USGS clarified on Facebook: “This was at Fissure 10, which has long displayed high temperatures (fortunately, no SO2 was detected). It does not mean an eruption there is imminent, but rather it is a place where various superheated gases are escaping.” Similarly, there’s been high temps at the cracks across Highway 130, which have steamed but so far not erupted at all.

USGS overflight photo, morning of June 12. Fissure 8 and Leilani Estates. I think that’s Nohea Street. (Full-sized)

Somewhat abbreviated Daily Digest today because I started late, and then took forever transcribing 11AM conference call. But the stunning pictures keep coming…

Continue reading June 12: Halema’uma’u’s Collapse Continues

June 11: USGS Conference Call: What’s Causing Summit Explosions?

Once again the USGS media conference call at 11AM is full of so much juicy info I’ve moved it to a separate post rather than make my daily digest 10 pages long.

July 10, 2017 HVO webcam panorama of Halema’umau compared with June 10, 2018. (Click for Full-sized)

BigIslandVideo hasn’t put their edited/abridged version up, which they usually enhance with recent video footage. But they cut a lot of the Q&A anyway.

Below are my paraphrase/notes on the full, unabridged conference call (I skipped a non-geology questions where answer is “Agency X handles that; ask them.”]

Continue reading June 11: USGS Conference Call: What’s Causing Summit Explosions?

June 12: Steve Brantley (USGS) Weekly Talk on Eruption

I didn’t realize I’d missed one of Steve Brantley’s excellent 10-minute slideshow presentations at the weekly Puna Community Meetings. This one took place on Tuesday, June 12 at Pahoa High School.

I learn something from every one of these talks, which sum up Kilauea eruption activity of the past week in a way that’s easy for the general public to understand without talking down to them.

Video of meeting is archived here. Steve’s presentation starts at timestamp 42:10. Where possible, I’ll be including images in my transcript which match his slides.

(Steve Brantley is a USGS geologist, deputy-scientist-in-charge of Hawaiian Volcano Observatory.)

Transcript

Hello everybody. Thank you for coming out again and thank you for your perseverance. I’ll show a couple slides of what’s been happening down in this part of the neighborhood and end with some slides of the summit area, which continues to change very dramatically.

Cutaway Diagram of Kilauea Volcano, adapted from USGS Characteristics of Hawaiian Volcanoes. (I’ve adjusted text and drawn arrow to match Steve Brantley’s slide in his presentations.)

So this is  the overview slide I’ve showed for the past few times. It gives you the overall picture. It’s an image, cartoon, from the summit area all the way out to the eastern tip of the island. The summit area here [under “Kilauea Caldera” label], eastern tip [down by “Kapoho Crater”], with a cross section showing you the general picture of the magma reservoir system from the summit of the volcano down through the East Rift Zone and into the Lower East Rift Zone.

Continue reading June 12: Steve Brantley (USGS) Weekly Talk on Eruption

June 11: USGS Press Conference (Halema’umau Subsidence, Ocean Upwelling)

At a 3PM press conference, Jim Kauahikaua (USGS geophysicist) described in detail the subsidence at Halema’uma’u. He also talks about a patch of “upwelling” where lava has entered ocean at Kapoho and seems to be traveling along ocean floor, heating water above it.

(Transcript below the cut)

Continue reading June 11: USGS Press Conference (Halema’umau Subsidence, Ocean Upwelling)

June 11: Summit Hiccups, Ocean Entry Upwelling

Fissure8’s “three closely space fountains” are starting to climb down, reported at 115-130 feet last night, and “fluctuating heights from below the 115 ft high spatter cone around it up to 180 feet” this afternoon. But its lava flow is still full to its banks, entering the ocean in Kapoho with minor steam explosions. “Weak lava activity” was spotted at fissure 16/18 last night.

USGS: “The three closely spaced lava fountains at fissure 8 reached maximum heights of 115-130 feet overnight. Lava fragments falling from the fountains are building a cinder-and-spatter cone around the erupting vent, with the bulk of the fragments falling on the downwind side of the cone. Fissure 8 continues to feed a channelized lava flow that reaches the ocean at Kapoho.” (Full-sized)

Last night, Kilauea’s summit hiccuped: there was a small explosion at 12:46am, after which, seismicity did not drop off until after another, larger explosion at 4:43am like the ones we’ve seen lately (registered as M5.4).

USGS: “A series of wide-angle webcam images, captured by a camera in HVO’s observation tower between June 1 and June 10, 2018, show ongoing subsidence around Halema‘uma‘u at the summit of Kīlauea in this animated GIF.” (Full-sized)

Since Saturday, Fissure 8’s gas emissions have been much higher than last week, whereas summit SO2 is half what it was before the current eruption. (I’m not sure why HVO’s Kilauea alerts report “volcanic gasses” for one and only SO2 for the other.)

(The “Lava Livestream” house is still safe, if marooned, near white mast): 

USGS: “Aerial view of the fissure 8 lava channel on Kīlauea Volcano’s lower East Rift Zone in the vicinity of the Kapoho cone, with fissure 8 fountains visible in the distance (upper left). Helicopter overflights of the eruption site are routinely scheduled to check for any new outbreaks of lava and to collect GPS data on the active flow—information that’s needed to make the flow field maps that are posted on HVO’s website” (Full-sized)

Here’s a double feature from Mick Kalber’s daily overflights— below is his June 11 lava video, but I missed his June 10 flyover vid and lava update notes.

Below the cut: more great images, overflight vids, and some interesting USGS answers to questions on social media.

Continue reading June 11: Summit Hiccups, Ocean Entry Upwelling