Take a look at Hawaii’s 5 other active volcanoes

Updated June 2, 2018 - 10:35 pm

HONOLULU — Hawaii’s Kilauea volcano has captivated people around the world by shooting lava high into the sky and sending rivers of molten rock pouring down hillsides into the ocean over the past month.

But Kilauea is only one of many volcanoes in Hawaii. Here’s a look at some of the others.

Why does Hawaii have so many volcanoes?

The Hawaiian Islands are a chain of volcanoes formed over millions of years. They’ve developed as the Pacific Plate — one of more than a dozen tectonic plates on the earth’s outer layer — slowly moves northwest over a stationary hot spot of magma under the earth’s surface. The hot spot partially melts an area under the Pacific Plate, sending magma to the ocean floor. Over time, lava accumulates and emerges above the ocean and builds islands.

One volcano is still submerged: The top of Loihi is currently 3,189 feet (975 meters) below sea level. Scientists estimate it will take about 200,000 years for it to pop out over the sea at its current eruption rate.

How many active volcanoes does Hawaii have?

The Hawaiian Volcano Observatory, part of the U.S. Geological Survey, defines an active volcano as one that has erupted within the past 10,000 years.

Hawaii has five such volcanoes in addition to Kilauea, though Kilauea is the only one currently erupting.

Three are on the same island as Kilauea: Mauna Loa, Mauna Kea and Hualalai. One is on Maui: Haleakala. The last is Loihi, which is underwater to Kilauea’s south.

Have any other volcanoes erupted recently?

Mauna Loa, which stands 13,679 feet above sea level, erupted for 22 days in 1984. Lava cascaded down its eastern flank to get within 4.5 miles of Hilo, the largest city on the Big Island. Scientists say Mauna Loa has erupted 33 times since 1864, for an average of once every six years over the past three millennia. It’s also the world’s largest volcano, with a peak that extends 55,700 feet from its base under the sea. Coffee farms and the beach resort town of Waikoloa sit on the mountain’s western and northwestern flanks.

To Mauna Loa’s northwest is Hualalai, which last erupted between the late 1700s and 1801. Eighty percent of Hualalai’s surface has been covered by lava in the past 5,000 years.

On Maui, Haleakala volcano is believed to have erupted last between 1480 and 1600.

Is there a volcano in Waikiki?

A volcano commonly known as Diamond Head grandly presides over Waikiki, the world-famous mecca for tourists in the state capital of Honolulu. It’s one of several volcanic craters on Oahu that scientists believe were formed between 40,000 and 500,000 years ago.

Diamond Head sits on top of a much larger volcano, called Koolau, that together with a second large volcano called Waianae forms most of Oahu’s land mass. The Koolau and Waianae volcanoes are about 2 to 3 million years old. No Oahu volcano is active.

What do people do on the volcanoes?

The highest peaks on each island are considered sacred in Hawaiian culture because they represent the realms of the gods and goddesses. There are shrines at the summits of Mauna Kea, Mauna Loa and Haleakala, including those honoring the heavens, the earth mother and ancestors. Ceremonies are sometimes performed at the summits.

The top of Mauna Kea, which is only slightly taller than Mauna Loa at 13,803 feet, hosts about a dozen of the world’s most advanced telescopes. The observatories take advantage of clear weather and limited light pollution to peer deep into the night sky. Mauna Loa and Haleakala also have several telescopes.

Watching the sunrise from the top of Haleakala and Mauna Kea has become a popular activity for tourists.

Tourists also enjoy visiting the crater at Kilauea’s summit, which is 4,009 feet above sea level and inside Hawaii Volcanoes National Park. Tourists also like to watch lava flowing down Kilauea into the ocean. But dangers posed by the current eruption have forced the Park Service to close the summit area and Hawaii County officials have restricted the ocean entry point.

Hotels, farms, cattle ranches, beaches and towns line the bases of the mountains.

How old is the oldest volcano?

Kauai and Niihau islands are the oldest of the eight main islands in the state of Hawaii. They were each formed about 5 million years ago. Erosion and landslides have produced dramatic cliffs on many of the older islands, like the Napali Coast on Kauai’s north shore. Molokai has the tallest sea cliffs in the world, according to the Hawaii Tourism Authority. They reach more than 2,000 feet above sea level.

Small atolls and seamounts northwest of the Main Hawaiian Islands are also believed to have been formed by the hot spot. The oldest atoll, Kure, is about 30 million years old.

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