Five Volcanoes !

All Hawaiians know the Big Island was created by the commingling lava flows from five immense volcanoes, but most visitors know only two – i.e., Mauna Loa and Mauna Kea.  And, somewhat uniquely, the volcanoes of Hawaii are not where plates meet, but actually thousands of miles from the nearest plate boundary in what is known as a “hot-spot” in the Pacific Plate.  Also, Hawaii’s volcanoes are not the type like Mt. St. Helens or Mt. Etna that can have explosive eruptions; they simply release flows of relatively fluid lava.

http://hvo.wr.usgs.gov/kilauea/

Currently there are two volcanoes on the Big Island classified as active:

1.   Kilauea, actively erupting for almost the past 30 years is the world’s most active volcano.  It has been spewing lava continuously since January 1983.   Kilauea nestles into the side of Mauna Loa and was once considered a part of Mauna Loa, but subsequent research showed that it has its own “magma-plumbing system.”  http://hawaii.aloha-hawaii.com/hawaii/big+island+volcanoes/

Located in Volcanoes National Park near the caldera of Kilauea is the “fire pit,” which is known as Halemaumau (“House of Everlasting Fire”).  Halemaumau at times has a contained lake of boiling lava. The pit is enlarged periodically by steam blasts and collapsing walls. Typical eruptions consist of lava flows forming lava lakes in Halemaumau or elsewhere on the caldera through fissures and rift zones.  Volcanoes National Park is actually Hawaii’s most visited tourist attraction, with nearly 9,000 daily visitors coming to the park. http://www.hawaiilogue.com/active-volcanoes-in-hawaii.html

Pele, the Hawaiian Volcano Goddess, is said to live within the Halemaumau firepit.

2.   Mauna Loa (“Long Mountain”), which last erupted in 1984 is the world’s largest volcano. It is also considered one of the most active volcanoes, having erupted 33 times since 1843.

Both of these active Hawaiian volcanoes share the Hawaiian hot spot, but retain unique volcanic histories and compositions.

And three volcanoes on Hawaii are generally classified as dormant:

1.   Kohala, the oldest, which is believed to have emerged from the sea more than 500,000 years ago.

2.   Hualalai, with six different vents that spewed lava, two of which produced lava flows that reached the ocean. The Kona International Airport is build atop the larger of the two flows. It last erupted in 1801, but some still consider it still “active,” which would be a major problem for the population center around Kona-Kohala.

3.   Mauna Kea (“White Mountain”), reaching 13,796 feet above sea level is the world’s tallest mountain (measured from the floor of the ocean to its summit) which last erupted about 4,000 years ago.  It is often snow covered in winter.  It is also the site of 13 astronomical observatories and is expected to be home to what will be the world’s largest telescope, the Thirty Meter Telescope.

       http://www.soest.hawaii.edu/GG/HCV/haw_formation.html  //hawaii.aloha-hawaii.com/hawaii/big+island+volcanoes/

Since the vast majority of earthquakes and volcanic eruptions occur near plate boundaries, how did the Hawaiian Islands which are entirely of volcanic origin, form in the middle of the Pacific Ocean almost 2,000 miles from the nearest plate boundary?

“J. Tuzo Wilson came up with the Hotspot Theory in 1963. According to his theory, the Hawaiian Island chain resulted from the Pacific Plate moving over a deep, stationary hotspot in the mantle, located beneath the present-day position of the Island of Hawaii. Heat from this hotspot produced a persistent source of magma by partly melting the overriding Pacific Plate. The magma then rises through the mantle and crust to erupt onto the seafloor, forming an active seamount.

Over time, countless eruptions cause the seamount to grow until it finally emerges above sea level to form an island volcano. As the plate movement carries the island beyond the hotspot, the magma source is cutoff, and volcanism ceases. As one island becomes extinct another develops over the hotspot.”  http://www.pdc.org/iweb/volcano_history.jsp

In fact right now a young submarine volcano called Loihi (“Long”) is growing about 20 miles south of the Big Island.  Its ascending summit is currently 3,000 feet below the ocean surface.  http://www.bestplaceshawaii.com/island_insights/bigisland/volcanoes.html

When most people envision a volcano, they think of a tall and cone shaped volcano (think Mount Hood outside of Portland, Oregon). These strato volcanoes tend to have dramatic and explosive eruptions (think Mount Saint Helens).

The five volcanoes of the Big Island are shield volcanoes, which are long and broad and have gently sloping hills.  Shield volcanoes’ lava has a lower viscosity, meaning that the lava is thinner and more fluid.  Because of the fluidity of the lava, major explosive eruptions generally do not occur.  This is why the almost constant flowing lava of Kilauea can be approached and seen by visitors to Volcanoes National park. http://www.hawaiilogue.com/active-volcanoes-in-hawaii.html

All the photos in this post are by Bryan Lowry, are © protected and usage requires his permission.  Please visit Bryan‘s website to see the vast collection of images by this award winning photographer whose photos have also appeared in National Geographic (http://lavapix.com). Significantly, 20% of Bryan’s website sales profits go to Easter Seals Hawaii on the Big Island.

Blog: Temperatures Drop Below Minus 459⁰F in Hawaii !

Perhaps the coldest spot in the universe is on the summit of Mauna Kea on the Big Island. It is inside a giant, complex camera known as SCUBA-2 that is mounted on the James Clerk Maxwell Telescope (JCMT), a joint project of the national astronomy organizations in the United Kingdom, Canada and the Netherlands.

SCUBA-2, when fully operational, will detect sub millimeter radiation, which is sensitive to the heat emitted by the extremely cold dust in the Universe. This technical advancement is expected to make discoveries related to the origins of the galaxies, stars and planets.

Looking at Scuba2

In order to detect such low levels of heat, the detectors inside the camera must be as sensitive as possible. To achieve this they must be cooled to within a tenth of a degree above absolute zero (or about -459 Fahrenheit). And to prevent the detectors being affected by heat from the camera itself, the internal optics of the camera must also be cooled. As a result, the complete camera is the size of a family car, weighing about four tons!

“With a much larger field-of-view and sky-background limited sensitivity, SCUBA 2 will map large areas of sky up to 1000 times faster than the current SCUBA camera. All areas of astronomy will benefit, from studies of our Solar System and surveys of proto stellar complexes in the Milky Way, to answering key questions about the formation and evolution of galaxies in the early Universe.” (Science & Technology Facilities Council, UK Astronomy Technology Centre).

More details may be found at http://astro.uwaterloo.ca/SCUBA2/Posters&Presentations/SCUBA2_descriptionV1.pdf

http://www.roe.ac.uk/ukatc/projects/scubatwo/

All photos are courtesy of Devany Davidson.

SCUBA-2 took seven years to build and was the result of a joint initiative of groups and institutions in the United Kingdom and Canada including the Astronomy Technology Centre (ATC) at the Royal Observatory, Edinburgh; the University of Cardiff; the University of Waterloo;the University of British Columbia; the University of Lethbridge; and the Université de Montréal. Initial funding for development work came from the JCMT Instrument Development Fund. Funds for the construction of SCUBA-2 were provided by the Particle Physics and Astronomy Research Council(UK) and the Canada Foundation for Innovation (CFI).

Apologizes to anyone who blogged “scuba diving” and ended up here.

Hawaii Island’s New Thirty Meter Telescope

Scientific American’s August issue had an article titled, Almost Heaven: Landing the Thirty Meter Telescope Fortifies Mauna Kea's Position as Earth's Eye on the Sky. I don’t know about the telescope claim, but those of us lucky enough to live here can almost certainly verify the “Almost Heaven” lead-in.

Actually, just this past July 21^st the Big Island was selected as the site for one of the world’s biggest telescopes – the 30 meter telescope (TMT). The project is expected to cost about $754 million in 2006 dollars, and could be operational by 2018.

Photo: Thirty Meter Telescope Observatory Corp.

This has not proven to be a non-controversial issue. For one thing, Native Hawaiian tradition believes that the high altitudes are sacred. And Mona Kea is also home to at least one confirmed burial site. Some also say that the telescope would require leveling the last pristine plateau on the mountaintop. The opposition from Native Hawaiian and environmental groups could constitute a lengthy blog of its own, and I hope some of my new Hawaiian friends will contribute such a piece.

Why Mauna Kea…..? For one thing, Mauna Kea already has 13 international telescopes so it must have something going for it. Nonetheless, other sites were considered, for instance in Chile's Atacama Desert and in Baja California, Mexico.

I learned from Chris Bailey’s article in Hawaii Magazine that astronomers love Mauna Kea because its summit sits above the clouds at 13,796 feet, offering a clear view of the sky for almost 300 days each year.

Also, Hawaii’s position in the middle of the Pacific Ocean means the area is relatively free of air pollution. And the mountain’s relatively isolated location from Big Island cities Hilo and Kailua-Kona leaves the summit largely devoid of man-made light to disrupt observations.

The Moonrise in the Shadow of Mauna Kea by Michael Connelley

Richard Ellis, astronomy professor the California Institute of Technology and a Thirty Meter Telescope board member, told reporters (Audrey Mcavoy, July 21st, 2009) that Mauna Kea is at a higher elevation, has drier air and its average temperature fluctuates less during the course of the day — all helpful factors for those using the new telescope.

Scientific American pointed out Site evaluations for the TMT began in 2001 with a team of scientists trekking to some of the most remote places on Earth. In the end, Mauna Kea, actually the summit of a dormant volcano that rises 9,750 meters off the ocean floor—the highest island mountain in the world – edged out the Atacama Desert for several reasons. One, it is higher by over 1,000 meters (3,280 feet), it has less water vapor (than a desert (?)), and the temperature rarely varies from 32 degrees Fahrenheit making it easier to control the expansion and contraction of the mirror and telescope.

Credit TMT Project

The telescope’s mirror — stretching almost 100 feet in diameter— will be so large that it hopes to gather light that has spent 13 billion years traveling to earth! This means astronomers looking into the telescope will be able to see images of the first stars and galaxies forming — just 400 million years after the Big Bang.

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We will be trekking ourselves to the top of Mauna Kea next month and are highly anticipating the adventure.