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Volcano explosion won’t be deadly if people stay out of park

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By SOPHIA YAN and SETH BORENSTEIN, PAHOA, Hawaii

A Hawaii volcano that sputtered lava for a week, forced around 2,000 residents to evacuate, destroyed some two dozen homes and threatened a geothermal plant now threatens to blow its top in the coming days or weeks.

Experts fear it could hurl ash and boulders the size of refrigerators miles into the air.

Scientists note that as long as people stay out of closed areas of a national park around the volcano, the possible explosion won’t be deadly.

“If it goes up, it will come down,” said Charles Mandeville, volcano hazards coordinator for the U.S. Geological Survey. “You don’t want to be underneath anything that weighs 10 tons when it’s coming out at 120 mph (193 kph).”

The added threat of an explosive eruption could ground planes at one of the Big Island’s two major airports and pose other dangers. The national park around the volcano announced that it would close indefinitely starting 10 p.m. Thursday because of the risks.

“We know the volcano is capable of doing this,” Mandeville said, citing similar explosions at Kilauea in 1925, 1790 and four other times in the last few thousand years. “We know it is a distinct possibility.”

He would not estimate the likelihood of such an explosion, but said the internal volcanic conditions are changing in a way that could lead to a blast in about a week. The volcano’s internal plumbing could still prevent an explosion.

If it happens, a summit blast could also release steam and sulfur dioxide gas.

Kilauea has destroyed 36 structures — including 26 homes — since May 3, when it began releasing lava from vents about 25 miles (40 kilometers) east of the summit crater. Fifteen of the vents are now spread through the Leilani Estates and Lanipuna Gardens neighborhoods.

Hawaii Gov. David Ige said crews at a geothermal energy plant near the lava outbreak accelerated the removal of stored flammable fuel as a precaution. The Puna Geothermal Venture plant had about 50,000 gallons (189,270 liters) of pentane. It was removed early Thursday.

Barbara Lozano, who lives within a mile of the plant, said she would have thought twice about buying her property if she had known the risks.

“Why did they let us buy residential property, knowing it was a dangerous situation? Why did they let people build all around it?” she asked.

Avani Love, 29, moved to the Big Island about a month ago from Maui with her four children. They evacuated their home May 3, and only found out it was destroyed when a relative went back to get her personal belongings.

While saying she’s sad to have lost her home, she also feels a sense of renewal brought on by Pele, the Hawaiian volcano goddess, to correct overpopulation of the island.

“Everyone comes here,” she said. “When you have that, it’s Pele’s way of clearing house and restoring the place. There’s beauty and also darkness.”

No one lives in the immediate area of the summit. Communities around 2 miles (3 kilometers) away may be showered by pea-size fragments or dusted with nontoxic ash, said Tina Neal, scientist-in-charge at the Hawaii Volcano Observatory.

What could happen is not an eruption of volcanic gases but mostly trapped steam from flash-heated groundwater released like in a kitchen pressure cooker, with rocks, said volcanologist Janine Krippner of Concord University in West Virginia.

The problem is the lava lake at the summit of Kilauea is draining fast, about 6.5 feet (2 meters) per hour, Mandeville said.

In little more than a week, the top of the lava lake has gone from spilling over the crater to almost 970 feet (295 meters) below the surface as of Thursday morning, Mandeville said. The lava levels in the lake are dropping because lava is spewing out of cracks elsewhere in the mountain, lowering the pressure that filled the lava lake.

“This is a huge change. This is three football fields going down,” Mandeville said.

The fear is that it will go below the underground water table — another 1,000 feet further down — and that would trigger a chain of events that could lead to a “very violent” steam explosion, Mandeville said.

At the current rate of change, that is about six or seven days away.

Once the lava drops, rocks that had been superheated could fall into the lava tube. And once the lava drops below the water table, water hits rocks that are as hot as almost 2,200 degrees (1,200 Celsius) and flashes into steam. When the water hits the lava, it also steams. And the dropped rocks hold that steam in until it blows.

A similar 1924 explosion threw pulverized rock, ash and steam as high as 5.4 miles (9 kilometers) into the sky, for a couple of weeks. If another blast happens, the danger zone could extend about 3 miles (5 kilometers) around the summit, land all inside the national park, Mandeville said.

The small, aptly named town of Volcano, Hawaii, population 2,500, is about 3 miles (4.83 kilometers) from the summit. Janet Coney is office manager of the Kilauea Lodge, an inn and restaurant. She said USGS officials told her lodge employees probably won’t have to worry about rocks raining down on them, but they might experience falling ash.

___

Borenstein reported from Washington, D.C. Associated Press journalists Audrey McAvoy, Caleb Jones, Haven Daley and Jennifer Sinco Kelleher contributed to this report.

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