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Volcano Comeback

At the world’s largest caldera lake, geologists are seeking clues to future volcanic activity, not only at Lake Toba in Indonesia but also at other supervolcano sites around the world, including the one at Yellowstone National Park.

Under the Hood

Mount Hood last erupted more than 200 years ago, but at Crater Rock, not far from the summit, the signs of volcanic activity are unmistakable. Gas vents and hot springs emit sulfur fumes. Vapors rising from deep under the mountain carve snow caves, which can seem like sanctuaries for climbers but often hold deadly concentrations of CO2 and other gases. Rocks fall frequently from the steep unstable cliffs of the partially collapsed crater.

The Earth Burps and Burns

When the Earth burps, WeiLi Hong listens. Whether Earth’s gaseous emissions bubble up from “mud volcanoes” on the planet’s surface or seep out of fissures on the ocean floor, the Oregon State University Ph.D. student has his monitoring gear to the ground.