An excellent video showing how pāhoehoe lava flows advance. A flow is a surprisingly complex process. A quick look or photograph will fail to reveal what it going on, it takes time to observe something that occurs this slowly. I have spent hours watching and filming flow fronts advance, totally amazed at what I saw when I really watched…
Time lapse shows the process more clearly than watching in person. It is the inflation of a pāhoehoe flow that shows in a compressed timescale. A flow a foot or two thick becomes six or ten feet thick over the course of a few hours. Also revealed are how other features of the flow form… The ropy surface, the broken plates, the cracks where lava has oozed out. After having watched a flow in process I see old lava flows in an entirely new way.
Below is an old video, filmed over several visits to the lava during the summer of 2010. I have better material now. Some time I need to put it together into a new video. Still, you can see the process of breakout, advance, crust over, inflate, then breakout again.
Flowing Rock from Andrew Cooper on Vimeo
I have yet to have an opportunity to see an ʻaʻā flow advancing. They move entirely differently. I understand the sound of an ʻaʻā flow is impressive, a moving gravel pile of grinding and falling rock.
You do not see milestones on modern highways. In the US they have been replaced by green, metal markers that number the miles you have traveled. Of course modern vehicles have odometers counting away those miles, distance and years put behind us in the many little journeys of life. Back and forth to work, around the island, daily routine and explorations. In a good life those miles represent both the mundane and little adventures.
I put well over 200,000 miles on my last vehicle. The new vehicle? Purchased with 78,000 miles already on the odometer, thus I can only claim the last 22,000 as mine alone. But this was a Keck fleet vehicle, I put a smattering of the previous 78,000 miles on this truck, either driving or riding up and down the mountain.
The odometer of the 2006 Ford Explorer at 100,000 miles
A good dive?
There may be a few criteria of a good diving experience. One of the top reasons I would call it a good dive… When the dive results in at least one really good photo.
This fellow was not in a cave, not in a wall, but out on the coral flats, and area not usually associated with great photo opportunities. Out on the flats the light is troublesome, in a cave or under an overhang I can control the light, eliminating the strong blue green hues that ruin so many photos. Under a coral head, I spot a fish just perched in the crevice. He did not move despite six or seven exposures with the camera a foot in front of him…
Redbarred hawkfish (Cirrhitops fasciatus) perched in a reef crevice
We have all been watching the lava flow for the past several weeks as it crept ever closer to the homes and businesses of Pāhoa. Not since the destruction of Kalapana in the 1980’s has the volcano threatened so much destruction. This historic plantation town is a special place, a town with a very unique character, a place that preserves some of what makes Hawaiʻi special.
This morning the flow crossed the first road above the town. If the flow keeps the current advancement rate it will be in the town over the next couple days. My thoughts are with the residents of Pāhoa… Stay safe!
The huge sunspot complex remains quite visible. The detail is fascinating in the eyepiece, well worth setting the telescope up again for another day.
The complex sunspot AR2192 visible on 24 October, 2014
Today, at 20:55HST, Venus will pass superior conjunction, passing around the far side of the Sun as seen from Earth. The planet will begin to rise into the evening sky in early December, arriving at maximum elongation June 6th, 2015.
Sunspot complex AR2192 is the largest I have seen in a long time. Easily visible without a telescope, simply using appropriate eye protection. It is quite large, more than ten times the diameter of the Earth. There are reports of it being noticed at sunset.
I photographed the sunspot during lunch fron Waimea, setting up a little telescope next to my vehicle in the Keck parking lot. The photo was taken using a TV-76mm telescope, the EOS-M camera and a Baader solar film filter, the same setup I viewed the Venus transit with.
Of course there was a partial solar eclipse today, visible across western North America. Photos of this enormous sunspot and the eclipse are now being posted across the web. Unfortunately this eclipse was not visible from Hawai’i. If you have not taken a look, I urge you to step outside with your solar viewing glasses and take a quick look. You do have solar viewing glasses handy… Right?
Sunspot complex AR2192 on 23 October, 2014, Canon EOS-M and TV-76mm telescope
A very young moon over Waikoloa, this is only 26 hours after new, visible to the unaided eye as a sliver in the fading glow of sunset
New Moon will occur today at 11:57HST.
A partial solar eclipse will sweep across western North America today, from Alaska to Mexico. For those in the best possible place the Moon will cover about 80% of the Sun. The eclipse will be visible for some distance out into the Pacific, but will not be visible in Hawai’i.
Continue reading New Moon…