Those lava flows have destroyed 27 homes and several other structures.
Hawaii County Managing Director Wil Okabe says the pentane was moved to an industrial park some 30 miles (48 kilometers) away from the Puna Geothermal Venture.
Scientists believe lava that's been erupting in a Hawaii residential neighborhood since last week is magma that's been stored in the ground since Kilauea volcano erupted in the same region 63 years ago.
The Hawaii National Guard is prepared, with only 90-minutes notice, to rescue some 2,000 people by ground convoy in troop-carrying vehicles and, if necessary, in Blackhawk or Chinook helicopters.
Tina Neal, the scientist-in-charge of the U.S. Geological Survey's Hawaiian Volcanoes Observatory, said geologists don't expect the summit eruption to be life-threatening so long as people stay out of the national park.
While locals contend with lava and gas on the ground, explosions at Kilauea's summit some 40 km to the west were dusting communities with ash that irritated eyes and breathing.
"What we've already been seeing is that chunks of the surrounding vents are just dropping off into the lava and that's why we're getting these small explosions", said Jessica Johnson, a volcanologist at the University of East Anglia in the United Kingdom.
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Ron Peters, 59, knew it was time to leave his home in the Opihikao community, 2.6 miles from Leilani Estates, when fruit trees and other vegetation began to die in the rotten-egg-smelling clouds of sulfur-dioxide gas. "Life and safety is what's most important". Scientists are now warning of the possibility of a violent eruption caused by trapped steam.
Meghan Holowath, a third-year geology student going on the trip, said most people have the idea of a Mount St. Helens-type explosion in their mind, but because of the magma type of Kilauea, that sort of explosive event is unlikely.
"We know the volcano is capable of doing this", Mandeville said, referring in part to steam-driven explosions that occurred at Kilauea in 1924 after a lava lake drained at Halema'uma'u crater.
Currently, there are no changes in the itinerary, said Nair, but that could change depending on further activity.
Once the lava drops, rocks that had been superheated could fall into the lava tube. But if the lava on the caldera is sucked down to the water table level, the explosive interaction could eject massive amounts of lava, poisonous gases, and choking ash. And the dropped rocks hold that steam in until it blows.
An explosion like this has occurred on the island before in 1924 and rocks weighing nearly 15 tons along with ash and steam were sent five miles into the air.
The USGS reports that similar explosions are likely to happen again, especially after magma migrates into the rift zones on the volcano's flanks, which seems to be occurring now.