The civil defense shared information about hazardous volcanic air pollution - known as "vog" - with Hawaii residents. And there is the super-volcano below Lake Taupo - previous eruptions from the magma chamber only about 6km below the lake-bottom rank as two of the world's most violent eruptions in recent geological history.
It also noted the possibility of volcanic ash raining down over wide areas.
"Steam-driven explosions at volcanoes typically provide very little warning", the HVO says.
Scientists with the U.S. Geological Survey's Hawaiian Volcano Observatory said Wednesday that the movement of magma from the summit out toward the Leilani Estates neighborhood, where 14 fissures have opened in the past week, has caused the lava lake at the top of the volcano to drop in elevation.
They say if there's an indication that a violent steam explosion will happen that's when the entire park will be shut down.
Smaller (pebble-size) rocks could be sent several kilometers (miles) from Halemaʻumaʻu, mostly in a downwind direction. In addition, there is a potential for sulfur dioxide emission. If conditions are right, that gas and other pollutants can settle with moisture and dust to create a haze called volcanic smog, or "vog", with tiny sulfuric acid droplets. And with new fissures opening closer to the edge of the plant, residents are getting even more anxious.
Yes. Kilauea is one of the most active volcanoes in the country - with 34 eruptions in the past 66 years - but the Big Island hasn't seen an explosive eruption since 1924, when eruption spewed ash 20,000 feet above sea level and 10-ton rocks into the sky, leaving one man dead.
Unlike Washington state's Mount St. Helens, Kilauea is a "shield volcano", a dome-shaped volcano built nearly entirely by lava flows.
Authorities also ordered workers to remove flammable pentane from a geothermal plant that is near communities that saw lava oozed from cracks in the ground.
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The plant is across the highway from where lava has been erupting in the Leilani Estates residential neighborhood.
A lava flow moves on Makamae Street in the Leilani Estates subdivision on Sunday, following an eruption by Hawaii's Kilauea volcano. But some had ignored the order and stayed to watch over their property.
With the lava in Halema'uma'u, the walls surrounding the dwindling lake are now steep and unstable, and rockfalls are inevitable, said Don Swanson, a geologist with the Hawaiian Volcano Observatory, said at a news conference yesterday. There was no sign of holdouts in Lanipuna afterward, he said. "Out of the island's 4,028 square miles, only less than a 10-square-mile area of Leilani Estates and Lanipuna Gardens Subdivisions in Puna is affected", a statement from the Hawaii Tourism Authority said.
USGS said lava activity along the volcano's lower East Rift Zone in Leilani Estates had paused but further cracks were expected.
County officials say as of Thursday 15 fissures have emerged.
Fourteen vents have opened since the current lava breakout began.
There is no indication when the eruption might stop, or how far the lava might spread.
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The amount of land covered by lava is similar to about 100 football fields, the affiliate reported. "We see what is happening now, and we know a bit about what happened the last time.so we can give warnings about what might happen next, but not with certainty".