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Lava outbreak on Hawaii island

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Lava outbreak on Hawaii island

Old 13th May 2018, 19:03
  #81 (permalink)  
 
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Today I saw something in the Daily Mail that just had my head in my hands.
May I suggest a solution to your “head in hands” problem? Don’t look at the Daily Mail!

It occurred to me the other day, that although our professions are otherwise completely different, there is one thing we have in common - we can never get away from our “work”. Wherever I go, there are rocks to look at; all you have to do is look up at the heavens!
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Old 14th May 2018, 02:20
  #82 (permalink)  
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Ed - not the Keck but I do work for one of the other observatories on Mauna Kea. I like your analogy of witnessing the birth of the universe and new land!

More eruptive activity this morning. This was a live stream from earlier this morning from the new most easterly fissure (link is to a public FB video). Apologies if you find the commentary a bit irritating. The explosions could be heard and felt miles away.

https://goo.gl/kTFfFh

Last edited by Hokulea; 14th May 2018 at 03:05.
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Old 14th May 2018, 02:45
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I think the cameraman qualifies for the 2018 Darwin Award!

l’m all for field geology, but I wouldn’t enter an area where there are hot lava bombs!
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Old 14th May 2018, 05:32
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I've taken an aerial picture and a map from the video about Fissure 16 and I've put some annotations on them, for discussion purposes.





I think any field geologist, looking at this picture and map would say that the linear nature of the multiple fissures suggests that they are opening up along a significant fault line. I suggest that it is probably the north bounding fault of the East Rift Zone.

A couple of observations:

1) The Puna Geothermal plant is only about 300 metres from the possible fault. However, if fissures opened up near the plant, any lava flows would flow downhill, which in this area is away from the plant. According to Google Earth, the plant is about 10 m higher than the potential fissures. So perhaps, the plant has dodged the bullet, although all bets are off, if there was a giant lava flow here. Also, I should point out that if Fissures 2 and 8 were reactivated and generated a much larger lava flow than the existing one on the map, the local topography would funnel it directly to the plant.

2) Apart from the idiocy of the cameraman walking through the field of lava bombs near Fissure 17, I found the video that Hakulea posted very interesting. I haven't read of any lava bombs like this related to the fissures in the Leilani Estates (although perhaps they haven't been reported). I was wondering if this might be related to higher pressures in the area of Fissures 16 and 17, where the elevation is about 70 metres lower. Assuming the lave is coming from the same magma chamber, then a rough calculation tells me that the pressure at Fissures 16 and 17 should be about 280 psi higher than at Leilani Estates (I converted from Kg/sq. m. - most people including me, don't relate to those units, never mind Pascals). That could account for the lava bombs. Of course I may be completely out to lunch, but the physicist in me was intrigued.

Last edited by India Four Two; 14th May 2018 at 05:55.
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Old 14th May 2018, 05:40
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He rattles along as if he is all alone and saying his final thanks and goodbye to the world, but towards the end we see a smiling lady holding a camera beside him.
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Old 14th May 2018, 05:43
  #86 (permalink)  
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Sounds like a war zone...

Video Landing Page - Honolulu, Hawaii news, sports & weather - KITV Channel 4
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Old 14th May 2018, 06:00
  #87 (permalink)  
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India Four Two - thanks for that excellent post. A couple of things to add: 1) a new fissure has just been reported, this one is in between fissures 16 and 17 (17 is the one in the video and is northeast of 16). 2) USGS has been telling us that the lava that has erupted so far from the 1955 event in the same area that was stored underground. This is based on a chemical analysis. Apparently, it cools at about 1% per year, so is cooler and less fluid. However, they expect newer lava from the Kilauea summit area will soon appear which will be much hotter and more fluid (i.e., pahoehoe) which will create much larger flows. They say they do not know where this might happen other than somewhere along the eastern rift.

Just to add, regarding the lava bombs, fissure 17 has been by far the most powerful eruptive activity so far in this event. There have been reports of small pepple-sized bombs elsewhere, but nothing like this.
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Old 14th May 2018, 06:57
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Hokulea,

I had been wondering about the probability of pahoehoe making an appearance. Do you know if the flows that emanated from the lava lake overflows in the Halemaʻumaʻu crater are pahoehoe?

For the non-volcano enthusiasts, here is a description of these two different lava types. It is interesting that both types have the same chemical composition. The difference in morphology is due to differences in viscosity and strain rate of flow (related to eruption rate and slope):

A'a and pahoehoe lava

A'a (blocky) lava advancing over an older pahoehoe (ropey) lava flow on Kilauea:


While "a'a" is a Hawaiian word meaning "stony rough lava", there is a joke among geologists that it comes from "ah! ah!", the exclamation you make when trying to walk over a (cold) a'a flow in bare feet!
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Old 14th May 2018, 07:08
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I believe the summit overflows were pahoehoe, but will try and confirm. The flows from Pu'u 'O'o were also mostly pahoehoe and that crater floor collapsed leading to this whole episode, so expect lava will appear farther down the rift. Pu'o 'O'o is part of Kilauea but is a separate vent a few miles from the summit. It's the vent that's been giving us all the lava flows since 1983.

PS. Confirmation that the recent summit overflows were pahoehoe.

https://volcanoes.usgs.gov/observato...html?vwid=1362

Last edited by Hokulea; 14th May 2018 at 07:22. Reason: Added confirmation
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Old 14th May 2018, 08:26
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For those that are awake, current live streaming video (don't know how long it will last). I believe this is either fissure no. 17 or 18 or even both.

https://goo.gl/vvk8wu
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Old 14th May 2018, 08:32
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Locked out. (Don’t do FB.)
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Old 14th May 2018, 08:38
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Weird. I don't have a FB account either but it works for me.
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Old 14th May 2018, 08:46
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Do you see the video screen at all with the play symbol? When I click on play the video disappears below the FB login or create an account window, but if you scroll down and hit the play button again it works for me. Hope you get to see it, it's quite mesmerizing.
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Old 14th May 2018, 09:09
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The live stream has ended. I'll try and find a link later for those that missed it and will likely just edit this post to do so.

ETA: the link I gave above ( https://goo.gl/vvk8wu ) should still work other than it won't be live. Sorry if it's still inaccessible and let me know if it is. I think it's public access and as I don't have a FB account and can see the video I'm not sure what else to do. On the other hand, if I find the same video on another site I'll happily share the URL. If FB users have suggestions I'd be interested to see them.

It's late, good night, and thank you for all your contributions.

PS. jolihokistix - try this: https://goo.gl/1Xw2uD

Last edited by Hokulea; 14th May 2018 at 11:51.
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Old 14th May 2018, 09:56
  #95 (permalink)  
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Old 14th May 2018, 10:46
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My daughter, who lives on Oahu, informs me ther is slight VOG around but it’s not bothersome. I wonder how the Japanese tourists are coping with the air quality. Quite a few of them wear face masks even when the air quality is good
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Old 14th May 2018, 10:48
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Thanks for the highlights reel, Orac!

Just before I finally got to bed I saw this video. I'd ignore the first ten minutes or so since it was the head of civil defense, but afterwards it was interesting when they questioned a USGS scientist.

https://goo.gl/rDhxVB

(public FB video)
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Old 14th May 2018, 10:56
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goudie- trades are relatively strong right now so doubt there's much impact of vog on Oahu. It's only when the trades die away and we get southerly winds when the other islands get vog (volcanic "fog") . They may get a little as there's a vortex formed west of the Big Island (Hawaii Island) due to Mauna Kea and Mauna Loa, but doubt they're getting health-threatening vog at the moment.
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Old 14th May 2018, 21:44
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Quite a few of them wear face masks even when the air quality is good
goudie,

After many years of traveling around Asia, including a few trips to Japan, I finally discovered the reason that Japanese travelers wear masks is not for fear of getting an infection, but because they are sick and they don’t want to infect someone else!

And since this is a pilot’s website, I’ll just mention that there is a TFR from surface to 3000’ over the eruptions, centred on a point near the east end of Leilani Estates, with a radius of 5 nm.
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Old 14th May 2018, 23:41
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For those who are following events closely, I recommend subscribing here:

Big Island Video News ? Serving Hawaii County
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