Mauna Kea Volcano
Tallest Mountain in the World

Mauna Kea Volcano rises high above the landscape on the north side of the Big Island, stretching 13,798 feet (4205 meters) above the beaches along the Kohala coast. Measured from its base, massive Mauna Kea is the tallest mountain in the world, towering 33,476 feet (10,204 meters) above the ocean floor.

Mauna Kea is over 1 million years old. Even though the last eruption is estimated to have occurred something like 4500 years ago, it is not considered extinct. It is a dormant volcano, meaning there is still a possibility that it will one day awaken and erupt again.

Mauna Kea Observatory

Recent earthquakes beneath Mauna Kea Volcano might signal an impending eruption, although earthquakes are not always indicative of that. Scientists do believe that another eruption will occur at some point in the future.

Continuous monitoring takes place with seismometers and a single GPS receiver (operated by NASA's Jet Propulsion Laboratory) on Mauna Kea itself, as well as instruments on Mauna Loa to the south and Kohala to the north.

Shield Volcanoes

Like all Hawaii Island volcanoes, Mauna Kea is a shield volcano. Shield volcanoes are generally large and wide with broad, gently sloping sides. The summit of Mauna Kea Volcano shown in the image below is a perfect example of a shield volcano. The shape is due to the fluid lava that flows gently and smoothly across long distances during an eruption, accumulating in broad sheets and layers as it cools.

Because shield volcanoes are most prominent in the Hawaiian chain, this type of eruption is also known as a Hawaiian eruption.

Summit of Mauna Kea Volcano

White Mountain

In Hawaiian, Mauna Kea is actually a short version of Mauna a Wakea. Wakea is the sky father, so Mauna a Wakea is the mountain that belongs to the sky. It is usually interpreted to mean White Mountain because of the snow that is often visible at the Mauna Kea summit.

If you are planning a trip to the top, prepare for cold. Even when there isn't snow on the mountain the temperature can be 40 or more degrees cooler than at the beach.

Mauna Kea snow

Mauna Kea Observatory

The Mauna Kea Observatory is second to none, with more than a dozen giant telescopes focusing on deep space. If the altitude doesn't take your breath away, the view certainly will! The air at this elevation is clean and crisp, making for impressive views in all directions.

Mauna Kea Observatory

Reaching the Summit of Mauna Kea Volcano

Certain Hawaii volcano tours should not be missed. This is one of them. Explore Mauna Kea and travel to the summit with the fascinating and informative Mauna Kea Summit and Stars Adventure.

Your Mauna Kea Summit Tour comes complete with informative guides, comfortable transportation, a picnic supper and warm clothing. On the way to the top you will stop at the Onizuka Center for International Astronomy Visitor Information Station. This is an important stop to begin adjusting to the extreme altitude. The visitor center has a nice gift shop, plus lots of information and videos highlighting the Mauna Kea telescopes.

Mauna Kea Summit Benchmark

It is possible to drive to the Mauna Kea summit and Mauna Kea Observatory, but the 7-mile road past the visitor center can be treacherous! It's risky without a 4-wheel drive vehicle. The road is rough, steep and unpaved in sections. Don't risk losing your brakes during the steep descent without the added benefit of 4-wheel drive.

Most rental car companies expressly forbid their cars being driven on the Mauna Kea summit road. Visiting the Mauna Kea Observatory is one place you're really better off joining a Big Island volcano tour.

Even if you are driving your own car, it's a good idea to stop at the Visitor Information Station long enough to begin getting acclimated to the high altitude. Remember, the air is much thinner when you are three miles above sea level! Altitude sickness is an all too common problem among visitors to the Mauna Kea summit. Drink plenty of water, and hang around at the visitor center for at least 30 minutes before continuing to the top. 

On top, there is a short but steep path leading beyond the parking area to the actual Mauna Kea summit. If you're up for it, this walk definitely will take your breath away. Otherwise, wander around and enjoy the impressive array of Mauna Kea telescopes, and stick around for an out-of-this-world sunset! At nearly three miles high, sunsets up here can be quite dramatic.

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