Earthquake! (or maybe Volcano!)

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Kendra
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Re: Earthquake!

#576

Post by Kendra » Wed May 23, 2018 4:18 pm

Why are they still there taking video? :brickwallsmall:



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Volkonski
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Re: Earthquake!

#577

Post by Volkonski » Wed May 23, 2018 4:27 pm

Kendra wrote:
Wed May 23, 2018 4:18 pm
Why are they still there taking video? :brickwallsmall:


So far the fissures in Leilani Estates follow a narrow line along the rift. Northeast of this line the roads aren't affected. People can drive into Leilani Estates from the north via Hwy 130. There is a roadblock at the entrance but I believe that residents are being allowed in.

https://www.google.com/maps/d/u/0/viewe ... jU1k1QH5AL


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Mikedunford
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Re: Earthquake!

#578

Post by Mikedunford » Wed May 23, 2018 4:31 pm

Mr. Gneiss wrote:
Wed May 23, 2018 4:14 pm
From my quick reads and the photos of the eruptions to date, the lava flows have been a'a' lavas. The video that volkonski just posted looks more like a pahoehoe flow.
My read from the various reliable sources on Twitter is that the earlier, a'a flows were believed to be from residual magmas from 1950s eruptions in the rift zone. Once the older and cooler magma was forced out and the magma from Pu'u o'o and the central vent reached the surface, the warmer and less viscous lavas started to result in faster-moving pahoehoe flows.
Off Topic
I've messed up good hiking boots on both a'a and pahoehoe. Difference being that I've sliced up the uppers of boots trying to get across a'a that was decades to centuries old, and the only time I managed to mess up boots by walking on pahoehoe was when the rock was probably less than days old and the bottoms of the soles got a little bit gooey.


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Volkonski
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Re: Earthquake!

#579

Post by Volkonski » Wed May 23, 2018 4:35 pm

Speaking of Leilani Estates-


Mileka Lincoln

@MilekaLincoln
#LeilaniEstatesEruption #KilaueaVolcano LATEST: New video provides an upclose look inside #LeilaniEstates where several fissures are fountaining; USGS confirms this is the most active area of the Kīlauea’s lower East Rift Zone … @HawaiiNewsNow #HINews

3:24 PM - May 23, 2018 · Pahoa, HI


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RVInit
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Re: Earthquake!

#580

Post by RVInit » Wed May 23, 2018 4:56 pm

In the Volcano videos thread there is an interesting video about types of lava.


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Re: Earthquake!

#581

Post by Volkonski » Wed May 23, 2018 7:09 pm

Today's map-

Image


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Kendra
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Re: Earthquake!

#582

Post by Kendra » Wed May 23, 2018 7:23 pm

RVInit wrote:
Wed May 23, 2018 4:56 pm
In the Volcano videos thread there is an interesting video about types of lava.
Thanks, will check it out shortly.



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Re: Earthquake!

#583

Post by Mr. Gneiss » Thu May 24, 2018 2:53 am

RVInit wrote:
Wed May 23, 2018 4:56 pm
In the Volcano videos thread there is an interesting video about types of lava.
Thanks RVInit. Seeing video of the flow types is much better than still photos.

Slightly off-topic, but still geology. The Hawaiian islands and several seamounts to the west-northwest and north west of the islands were built by a mantle hotspot. One can think of it as a blow torch that burned holes through the oceanic crust of the Pacific tectonic plate. The Pacific plate had a change in direction in the past, which is documented by the positions of the seamounts in the Emperor Chain and Hawaiian Chain.

Here is a graphic showing the island building over the last 80 Ma caused by the Hawaiian hotspot. The prevailing theory when I studied geology was that the hotspot was stationary and the Pacific plate did all the moving. The graphic shows an apparent abrupt change in direction of the Pacific plate at approx. 47 Ma.
Image

And here is the abstract to a 2017 Nature article that contains the graphic. It revises the theory to include some movement by the hotspot.
Pacific plate motion change caused the Hawaiian-Emperor Bend
A conspicuous 60° bend of the Hawaiian-Emperor Chain in the north-western Pacific Ocean has variously been interpreted as the result of an abrupt Pacific plate motion change in the Eocene (∼47 Ma), a rapid southward drift of the Hawaiian hotspot before the formation of the bend, or a combination of these two causes. Palaeomagnetic data from the Emperor Seamounts prove ambiguous for constraining the Hawaiian hotspot drift, but mantle flow modelling suggests that the hotspot drifted 4–9° south between 80 and 47 Ma. Here we demonstrate that southward hotspot drift cannot be a sole or dominant mechanism for formation of the Hawaiian-Emperor Bend (HEB). While southward hotspot drift has resulted in more northerly positions of the Emperor Seamounts as they are observed today, formation of the HEB cannot be explained without invoking a prominent change in the direction of Pacific plate motion around 47 Ma.
Off Topic
Back in my youth when I was filled with wickedness I would torment young Earthers with a similar graphic. I would tease them about the tectonic plate velocity required to create all those seamounts in their young Earth "models". Poor Adam and Eve would not have been able to stand from the magnitude and frequency of the earthquakes. And then I'd tell them to explain how the velocities screeched to a near stop that is approximately the same as the velocity that fingernails grow. ;)



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Re: Earthquake!

#584

Post by Mr. Gneiss » Thu May 24, 2018 3:05 am

Mikedunford wrote:
Wed May 23, 2018 4:31 pm
Off Topic
I've messed up good hiking boots on both a'a and pahoehoe. Difference being that I've sliced up the uppers of boots trying to get across a'a that was decades to centuries old, and the only time I managed to mess up boots by walking on pahoehoe was when the rock was probably less than days old and the bottoms of the soles got a little bit gooey.
Off Topic
My mention of "a new a'a' lava bed" was in the context of new in geologic time. It takes more than a few centuries for chemical weathering to dull the edges of the microscopic razor blades in the basalt flow.



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Notorial Dissent
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Re: Earthquake!

#585

Post by Notorial Dissent » Thu May 24, 2018 3:43 am

It has always fascinated me how something that dangerous and destructive can be so beautiful.


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Re: Earthquake!

#586

Post by RoadScholar » Thu May 24, 2018 5:52 am

Ever met any fashion models?


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Re: Earthquake!

#587

Post by TollandRCR » Thu May 24, 2018 6:24 am

The Nature post includes an abbreviation about whinch I was uncertain.

A widespread practice has arisen in the last few decades that gives dates (not ages) in the format "X Ma" (x million years ago); for example, rocks that formed 5 million years ago are said to date from 5 Ma. "5 Ma" is a point in time that is 5 million years from the present.


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Re: Earthquake!

#588

Post by Foggy » Thu May 24, 2018 7:31 am

RoadScholar wrote:
Thu May 24, 2018 5:52 am
Ever met any fashion models?
:rotflmao:


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Re: Earthquake!

#589

Post by Volkonski » Thu May 24, 2018 9:20 am



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Kendra
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Re: Earthquake!

#590

Post by Kendra » Thu May 24, 2018 10:39 am

These maps are so helpful, thank you for posting them.



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Mikedunford
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Re: Earthquake!

#591

Post by Mikedunford » Thu May 24, 2018 10:52 am

Mr. Gneiss wrote:
Thu May 24, 2018 3:05 am
Mikedunford wrote:
Wed May 23, 2018 4:31 pm
Off Topic
I've messed up good hiking boots on both a'a and pahoehoe. Difference being that I've sliced up the uppers of boots trying to get across a'a that was decades to centuries old, and the only time I managed to mess up boots by walking on pahoehoe was when the rock was probably less than days old and the bottoms of the soles got a little bit gooey.
Off Topic
My mention of "a new a'a' lava bed" was in the context of new in geologic time. It takes more than a few centuries for chemical weathering to dull the edges of the microscopic razor blades in the basalt flow.
Off Topic
Honestly, I didn't notice that you had used the word "new." But, yes, I definitely agree on the amount of time an a'a bed can stay 'new' enough to hurt - looking at the geological map, the flow I completely destroyed an almost-new pair of hiking boots on is in the 200-400 year range.


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Re: Earthquake!

#592

Post by AndyinPA » Thu May 24, 2018 10:58 am

We stayed at the Volcano House, which overlooks the crater, in 2014. I went to the website to see if they are closed, and they are. The national park is also closed. It opened in 1846 and has a fire burning in a fireplace that has constantly burned since the hotel opened.

From memory, I would say that the danger of staying at the hotel is the fumes, not the lava flow.

https://www.hawaiivolcanohouse.com/



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Re: Earthquake!

#593

Post by Volkonski » Thu May 24, 2018 11:43 am


Dane duPont
@GeoGolfHawaii
HPD have started to give 'obstruction of traffic' tickets for parking inside Leilani Estates. #KilaueaEruption #LeilaniEstates

2:06 AM - May 24, 2018


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Re: Earthquake!

#594

Post by Volkonski » Thu May 24, 2018 4:06 pm

THe Leilani Estates area has become more active last night and today. Probably why the police are cracking down.


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#LeilaniEstatesEruption #KilaueaVolcano LATEST: A major eruption is reportedly #HappeningNow on Hoʻokupu St; fissure starts on Leilani Ave at Makamae St & angles toward Hoʻokupu on Kahukai side down to Kaupili @HawaiiNewsNow #HINews (Photo: Ikaika Marzo)


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Re: Earthquake!

#595

Post by Volkonski » Thu May 24, 2018 4:25 pm

Early this morning in Leilani Estates. Videographer confirms new fissures and police crackdown.



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Re: Earthquake!

#596

Post by Volkonski » Thu May 24, 2018 4:50 pm

Video from the center of Leilani Estates looking east this morning. Looking at location of F2, F7, F21, F14, F3, etc.



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Re: Earthquake!

#597

Post by Volkonski » Thu May 24, 2018 4:54 pm

After sunrise this morning.



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Re: Earthquake!

#598

Post by Volkonski » Thu May 24, 2018 5:30 pm


USGS Volcanoes🌋

@USGSVolcanoes
May 24 morning #HVO #Kilauea update: Middle portion of fissure system most active, fissures 2, 7, 8, 3, 14, 21 reactivated & are spattering. High gas emissions near fissures. Small ash emissions and earthquakes at summit continued overnight. https://volcanoes.usgs.gov/volcanoes/ki ... tatus.html … #KilaueaErupts

2:08 PM - May 24, 2018


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Re: Earthquake!

#599

Post by Volkonski » Thu May 24, 2018 6:43 pm


USGS Volcanoes🌋

@USGSVolcanoes
May 24 #HVO #Kilauea video update (Wendy Stovall): Fountaining & lava flows b/t fissures 8 & 22 (2 mi dist). 2 lava channels flowing to coast, easternmost split to make 3rd ocean entry. Small explosive eruptions & shallow M3.9 EQ @ summit. …#KilaueaErupts

5:00 PM - May 24, 2018


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Re: Earthquake!

#600

Post by Volkonski » Thu May 24, 2018 6:45 pm



Mileka Lincoln

@MilekaLincoln
#LeilaniEstatesEruption #KilaueaVolcano UPDATE: An incredible volume of lava — an estimated 40-60 cubic feet per second — is spewing from active fissures in #LeilaniEstates; USGS confirms activity is “migrating west” across 2 miles @HawaiiNewsNow #HINews

5:29 PM - May 24, 2018


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