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Lava outbreak on Hawaii island

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Lava outbreak on Hawaii island

Old 15th May 2018, 04:21
  #101 (permalink)  
 
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May 14 update video by USGS Scientist-in-Charge Tina Neal. It shows some aerial views of the extent of the lava flow at Fissure 17


I have watched several videos that have included statements by Ms. Neal. She had always been clear, concise and authoritative, unlike the performance of the Civil Defense head.
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Old 15th May 2018, 05:10
  #102 (permalink)  
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She has certainly earned the respect of everyone here.

A video was released yesterday showing the chain of events since April 21st. I've also just learned more about PGVs plans to plug their wells. Apparently, they will poor water into the wells to cool everything down and then plug the wells with iron rods.


Last edited by Hokulea; 15th May 2018 at 08:33.
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Old 15th May 2018, 05:35
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Hokulea,

That’s a great video - it clearly summarizes the history. The pattern of earthquakes is particularly interesting.

What magnitude does a tremor have to be for you to feel it where you live? In my experience, I generally don’t feel earthquakes of less than Magnitude 4.

Do you have a reference to the “iron rods”? That’s not a terminology that is used in the oil industry and of course the PGV wells will have been drilled and completed using oil-field technology.
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Old 15th May 2018, 05:41
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Same here, India Four Two, typically mag 4 and greater although obviously it depends on location and depth. There's also a bit more about plugging the PGV wells from Big Island Video News.

VIDEO: Effort Underway To Kill Puna Geothermal Wells
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Old 15th May 2018, 06:02
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I’ve just watched the video. It sounds very similar to the procedures used on oil and gas wells. Pump fluid downhole to “kill” the well, that is, to stop fluids flowing into the bottom of the well from the surrounding rocks and then set one or more “plugs” in the upper part of the well to completely isolate the well head from the bottom of the well.

What was not clear was whether they are planning temporary or permanent plugs. In the case of permanent plugs, it may be difficult if not impossible to use the wells again. A permanent plug is created by setting a temporary plug known as a packer and then pumping cement into the well bore above the packer.

The actual process is more complicated than that, but the above is the gist of it.
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Old 15th May 2018, 06:06
  #106 (permalink)  
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India, the reference to iron rods was from a local TV station's news broadcast, so take it with a pinch of salt. I haven't found anything online yet, but will post and update the info if I find something.
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Old 15th May 2018, 06:13
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Shirley they have considered what magma might do to any particular type of plugging method? Might be charting new territory here.
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Old 15th May 2018, 06:33
  #108 (permalink)  
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For PGV I'm sure it is charting new territory as it was built since the last activity in that area. I don't know if other geothermal plants around the world have had to deal with the same situation.
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Old 15th May 2018, 08:53
  #109 (permalink)  
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Our coconut wireless, which can be remarkably accurate at times, is saying USGS is testing the lava from fissure no. 17 as there is a concern that some of the lava being erupted there is newer lava from Pu'u 'O'o and possibly pahoehoe. Results expected tomorrow.
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Old 16th May 2018, 05:39
  #110 (permalink)  
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Today's update from Big Island Video News:


The activity at the summit has increased today with pulses of ash eruptions, and a "code red" has been issued for aviators. The ash has been erupting up to about 10,000 to 12,000 feet. Fortunately, this doesn't seem to have affected regularly scheduled airline traffic to the island at this time. The alert is available via https://volcanoes.usgs.gov/volcanoes...ea/status.html and depending on the time you look at this page, you might have to scroll down as all the Kilauea alerts are posted to this page.
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Old 16th May 2018, 06:08
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I suppose it is in bad taste to complain that on our visit to the Big Island a few years ago all we saw was a few wisps of steam and a faint smell of S02 (definitely not H2S)
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Old 16th May 2018, 06:30
  #112 (permalink)  
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Shame you didn't even get to see an active lava flow. There have only been a few occasions in the last 30 years or so that one hasn't been visible from somewhere.
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Old 16th May 2018, 08:54
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Volcanic ash and airline flights

All - hope you don't mind but have a request for airline pilots, geologists and meteorologists. Right now ash from Kilauea is only getting as high as roughly 12,000 feet and is not affecting the two main airports on the island, Hilo and Kona, flights are arriving normally. However, things may change at the summit and we may get ash erupted to higher levels and then it depends on the upper-level winds as to where the ash goes. I realize every airline and eruption is different, but what would an airline or pilot use to decide if it's unsafe to fly to either airport and what information would you rely on? As you might imagine, if airlines stop coming here for a period of time it will be a big issue for residents and tourists. Many thanks in advance.

Last edited by Hokulea; 16th May 2018 at 09:10.
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Old 16th May 2018, 10:24
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Hi Hok, my airline, and I am sure most others, rely on reports from the appropriate VAAC (Volcanic Ash Advisory Center). I spend a lot of time transiting Indonesian airspace. These reports are included as a separate sheet with our planning documents, with a graphical representation of the area affected. Wind at various altitudes plays the main role in the forecasts. If ash is forecast in the area I avoid, avoid, avoid! VA is bad news; not only does it clog engine turbine blades (forms glass like deposits in the heat), but clogs instrument probes and can abrade windscreens to zero visibility. It can cause radio static and weird St Elmo’s fire effects. A VA cloud can look like innocuous stratus and doesn’t show on radar.

A few times VA alerts come up in flight and some sharp pencilling with the fuel after the subsequent reroute is in order. Low level (altitude) eruptions seem more localised and more subjective regarding what a given airline does, and the airlines are at the mercy of the local observers/reporters. 12,000’ is not that high to cause widespread disruption in my opinion; but watch this space! Effects depend on the local winds. I would suggest that Hawaiian reports would be up there with the best in reliability.

You may recall the chaos caused in Europe by that unpronounceable Icelandic volcano years ago that I believe went higher into the atmosphere, where some consider the reports and subsequent disruption a little ‘conservative’. But as above, you cannot mess about with VA.

I hope this helps and best wishes,

Larry Dart.

Last edited by Captain Dart; 16th May 2018 at 10:35.
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Old 16th May 2018, 10:28
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Old 16th May 2018, 10:43
  #116 (permalink)  
 
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Originally Posted by India Four Two View Post
I’ve just watched the video. It sounds very similar to the procedures used on oil and gas wells. Pump fluid downhole to “kill” the well, that is, to stop fluids flowing into the bottom of the well from the surrounding rocks and then set one or more “plugs” in the upper part of the well to completely isolate the well head from the bottom of the well.

What was not clear was whether they are planning temporary or permanent plugs. In the case of permanent plugs, it may be difficult if not impossible to use the wells again. A permanent plug is created by setting a temporary plug known as a packer and then pumping cement into the well bore above the packer.

The actual process is more complicated than that, but the above is the gist of it.
Quite right. Most likely the wells will need pretty hefty cement plugs - Personally I would cement the whole wells, tout de suite, due to the risks of communication past any plug, retrievable or otherwise - write them off and start again when things are stable.... However another option is do nothing, solidified lava would probably do the job just as well!
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Old 16th May 2018, 10:47
  #117 (permalink)  
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Thank you, Cpt Larry, really appreciate your time to respond here, it was very helpful. And yes, I remember the unpronounceable eruption although fortunately wasn't affected by it at the time, although I do fly to Europe quite regularly. Hawaii has its own unpronounceable names, at least for me, but a little easier to spell compared to Iceland. For instance, the ash eruption is currently occurring at the Halemaʻumaʻu crater on Kilauea.

ORAC - I have some reading to do! I appreciate the link as it also includes all sorts of other things I may have wanted to ask over time!
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Old 16th May 2018, 12:36
  #118 (permalink)  
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Several earthquakes underneath Kilauea tonight, probably rockfalls in the lava-evacuated vent. It might be an interesting sight in a few hours when daylight returns:

https://volcanoes.usgs.gov/observato...l?webcam=KIcam
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Old 16th May 2018, 19:14
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I found this interesting post from May 14, on the USGS website:

There have been several recent highly speculative stories, rumors and blogs about the stability of the south flank of Kīlauea and the potential for a catastrophic collapse that could generate a Pacific-wide tsunami. We wish to put these speculations in their proper context by presenting observations of the current situation and an assessment of past evidence of landslides from Kīlauea.
https://volcanoes.usgs.gov/observatories/hvo/

Concerning the unpronounceable Icelandic volcano, I was stranded in the UK in 2010 due to the ash. While I was there, a new MacBook Pro that I had been waiting for, arrived in the Apple stores. So I bought one and named it Eyjafjallajökull, in honour of my enforced departure delay. I’ve continued the tradition with subsequent laptops, but my latest one is called Hekla, which is a bit easier to pronounce!
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Old 17th May 2018, 05:35
  #120 (permalink)  
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Yes, there's been a lot of wild speculation of the Hilina slump, we even had a civil defense alert last night about the rumours.

Overnight there was some explosive activity at Kilauea's summit caldera. Dense basalt rocks about two-feet in diameter were launched into the parking lot a few hundred yards south of the vent. There's also been a fair amount of seismic activity in that area and the whole floor of the caldera has fallen three-feet which USGS is stressing the existing faults and therefore causing the earthquakes. Cracks appeared on highway 11 just outside the entrance to the Volcanoes National Park which is causing a bit of concern as it's the only direct route between Hilo/Puna and the Ka'u area on the southeast coast.

Last edited by Hokulea; 17th May 2018 at 10:00.
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