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Title : Kilauea volcano lava covers potentially explosive wells
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Kilauea volcano lava covers potentially explosive wells

A lava flow from Hawaii's erupting Kilauea volcano that damaged a geothermal power station has stalled, as have lava fountains that had gushed 30 metres into the air, offering momentary relief to an area under siege for 25 days, officials said on Monday.

Even so, new blasts from the crater at the volcano's peak sent ash plumes billowing as high as 4,000 meters into the sky, and a new fissure was pumping out lava at a rate of one metre per second, geologists said.

The new fissure sent more lava into the to evacuated Leilani Estates district in the eastern corner of Hawaii's Big Island.

Lava engulfed the heads of two potentially explosive wells that tap into steam and gas deep in the Earth's core at the 38-megawatt Puna Geothermal Venture on Saturday.

The Hawaii Civil Defence Agency said earlier the wells are "stable and secure," but the plant's operator, Israeli-controlled Ormat Technologies Inc, said it had not been able to assess the damage.

Lava has never engulfed any of the world's geothermal plants and the potential threat is untested, according to the head of the state's emergency management agency. Local residents fear an explosive emission of deadly hydrogen sulfide and other gases should wells be ruptured.

Lava approaches Puna Geothermal Venture in the Leilani Estates near Pahoa on Monday. (Marco Garcia/Reuters)

Since the volcano began a once-in-a-century-scale eruption on May 3, authorities have shut down the plant, removed over 225,000 litres of flammable liquid, and deactivated the wells. 

Magma has drained from Kilauea's summit lava lake and flowed around 40 kilometres east underground, bursting out of about two dozen giant cracks or fissures near the plant.

The 38-megawatt plant typically provides around 25 per cent of electricity on the Big Island, according to local power utility Hawaii Electric Light.

A more thorough <a href="https://twitter.com/hashtag/HVO?src=hash&amp;ref_src=twsrc%5Etfw">#HVO</a> <a href="https://twitter.com/hashtag/Kilauea?src=hash&amp;ref_src=twsrc%5Etfw">#Kilauea</a> May 28: status update Pahoehoe flows crossing Pohoiki Road in <a href="https://twitter.com/hashtag/LeilaniEstates?src=hash&amp;ref_src=twsrc%5Etfw">#LeilaniEstates</a>, ongoing ground cracking, continued elevated summit seismicity and ash clouds to 10,000 &amp; 12,000 ft. Photo by B. Houghton, UH Manoa. <a href="https://t.co/7sDZqcx8dU">https://t.co/7sDZqcx8dU</a> <a href="https://twitter.com/hashtag/KilaueaErupts?src=hash&amp;ref_src=twsrc%5Etfw">#KilaueaErupts</a> <a href="https://t.co/heWCdX2tV8">pic.twitter.com/heWCdX2tV8</a>

&mdash;@USGSVolcanoes

Over the weekend, there were more than 250 earthquakes at Kilauea's summit, with four explosions on Saturday sending ash as high as 4,500 metres, officials said.

Winds are set to shift on Monday and Tuesday, causing higher concentrations of ash and volcanic smog that will spread west and northwest to affect more populated areas, said National Weather Service meteorologist John Bravender.

U.S. Marine Corps and National Guard helicopters are on standby for an air evacuation if fissure activity cuts off Highway 130, the last exit route for up to 1,000 coastal residents.

More residents in some sections of the Leilani Estates neighbourhood were ordered to immediately evacuate shortly before 8 p.m. local time on Sunday "due to a fast moving lava flow from Fissure 7," a statement from the civil defence agency said.

Officials had no information on how many residents still remained in the neighbourhood or how many people might have already left. Local media has reported that about 2,000 people have already evacuated since the new eruptions began.

Onlookers catch a glimpse of the Kilauea volcano near Pahoa on Saturday. (George F. Lee/The Honolulu Advertiser via AP)

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