The lava is "enough to cover Manhattan 6.5 feet deep" and fill 11.3 million average dump trucks, it said. "A lot of, 'What now?'" said Big Island Mayor Harry Kim, who spoke at a news conference Monday.
Hawaii County Civil Defense agency officials are allowing residents with official credentials to enter Leilani Estates.
The lava is also flowing into the ocean, where it has created about 200 acres of new land, while also releasing risky gas plumes and causing explosions as the molten rock hits the cold water. But in the past two weeks, more vigorous lava flows have poured downhill to the coast, blocking roads and destroying hundreds of homes in the Kapoho and Vacationland areas.
Fenton said he was "amazed at the amount of devastation" he has seen and that it is "going to take a whole community effort" to help in the recovery, KGMB reports.
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Officials warned that gas emissions from Fissure 8 have doubled triggering air quality concerns, according to Hawaii News Now.
Aerial images in the video below show rivers of lava flowing the Kilauea Volcano on Monday.
The federal agency also reported a new 5.3 magnitude quake at 02:52 pm BST that had Kilauea unleash yet another plume of ash and smoke from its summit.
"Just a few days ago Kapoho Bay was a handsome vacation destination, filled with vacation homes, handsome beaches and clear water", Forbes wrote last week. A part for repairs was expected soon, said Robert Ballard, science and operations officer for the weather service in Honolulu.
The USGS warns against trying to explore the risky ocean entry points because the potentially explosive meeting of lava and water can send debris flying.