TheBigOutside Blog

Michael Lanza, creator of TheBigOutside.com and Northwest Editor of Backpacker Magazine, writes about hiking, backpacking, climbing, backcountry skiing, paddling and other self-powered outdoor adventures

Archive for Mt. Tongariro

Super Volcanoes: Hiking New Zealand’s Tongariro National Park

We have just begun our all-day hike over some of the volcanoes of New Zealand’s Tongariro National Park when a trailside sign conveniently itemizes the life-threatening hazards awaiting us.

For starters, an eruption could eject large rocks into the air to rain onto us from the sky or release lava flows. Pyroclastic flows, which are clouds of ash, rock, and gas that can cook flesh, could come upon us at 60 mph. Just such a flow in 1975, in fact, formed the black rocks we’re standing on. Even short of a volcanic eruption, deadly volcanic gases can pool in the bottom of craters on calm, sunny days like today. And the rock on these peaks is so unstable that falling rock looms as a constant hazard.

Should we notice any signs of an eruption—an earthquake, for instance, or an ash cloud, or that other telltale indicator, rocks flying incongruously through the air—we should “move as quickly as possible down off the mountain.”

Yea, sound advice. In theory, anyway.

I find the sign rather comforting, actually: Before exploring a new place, I like knowing what could kill me there.

The warnings are not hyperbolic. Tongariro National Park looks like a place recently devastated by a very big bomb—which is, in a sense, what happened. The first volcano we will climb, Mt. Ngauruhoe, erupted 45 times in the 20th century. Red Crater, also on our itinerary today, last erupted about 130 years ago—an eye blink in geologic time. Mt. Ruapehu, dominating the horizon just a few miles to the south of Ngauruhoe, ranks among the world’s most active volcanoes. Blowing its top with a major eruption roughly every 50 years for at least the past 250 millennia—including in 1895, 1945, and 1995-1996—Ruapehu has also experienced at least 60 “minor” eruptions since 1945, some of which produced ash falls and lahars, which are deadly flows of mud and rock.

Sounds like very serious stuff.

I’m spending the day hiking a 12.1-mile loop over three of the main volcanoes and craters of Tongariro, in the center of New Zealand’s North Island. Established in 1887—just five years after Yellowstone became the world’s first national park—Tongariro was New Zealand’s first national park and the world’s fourth. It is also a dual World Heritage area, recognized both for its importance to the culture of the Maori, the original people of these islands, and for its natural values. Besides prolific volcanism and associated natural features, the national park is known for its strikingly stark, colorful landscape.

Read the entire story and see photos and a video from this trip at thebigoutside.com/Tongariro_Volcanoes.html. See other stories about outdoor adventures at TheBigOutside.com.

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