Episode 15

Reading the tiltmeter data it was clear that the pressure was building again, an eruption appearing likely in the next day or two. The last episodes have produced ever higher lava fountains, I expect episode 15 to go even higher and I truly wish to see it when it happens.

Right on schedule the first lava appeared, a little rivulet of lava overflowing the north vent onto the crater floor. If the pattern repeated this would be followed by high lava fountains in the next ten hours or so. Episode 15 was on.

Strong glow from the eruption vents illuminate the heavy volcanic plume above between surges
Strong glow from the eruption vents illuminate the heavy volcanic plume above between surges

Tomorrow it would be, and as tomorrow was also a holiday for me, Prince Kūhiō Day, I would be free to make another volcano run!!

We are a go.

The same plan… a 2am alarm, hit the road, 4am in the park, hike to the Keanakāko’i viewpoint.

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Geology of Waikoloa

While writing up my visit to Goat House Tube I was again wondering how old the lava tube was, it is clearly old, but how old?

A Google Earth image of Waikoloa overlayed with a geologic unit map
A Google Earth image of Waikoloa overlayed with a geologic unit map showing the various lava flows from Mauna Kea and Mauna Loa, pinks are Mauna Kea flows while Mauna Loa flows are green

Most of the Mauna Kea lava flows upon which Waikoloa sits are ten to twenty thousand years old, but the Mauna Loa flows that start just south of the village can be quite a bit younger.

Just a few miles south of the village one can find the 1859 Mauna Loa flow, the longest lava flow in the state representing a very long eruption that produced an enormous volume of lava. This is the flow that reshaped Kiholo bay, destroying the large fishponds that could once be found there.

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Goat House… Again

The upper power line entrance to Goat House Tube
The upper power line entrance to Goat House Tube

It has been a while since I last hiked out to Goat House Lava Tube. A bit obscure, the tube hides in the grasslands outside Waikoloa Village, accessible with a modest hike.

With the new eMTB this tube is even easier to get to. The power line access roads are rough, simple tracks just scraped into the lava, but fun. A good road to enjoy with a full suspension bike bouncing over the bare rock.

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