The lava flow has covered about 7.7 square miles of the island, according to the USGS.
Lava early Tuesday destroyed the mayor's second home, Snyder said.
Before this morning's explosion, more than 100 structures had been destroyed since the first eruption a month ago.
When asked at a news conference Sunday night how many people remain stranded by lava, Hawaii Civil Defense Administrator Talmadge Magno did not provide much more detail, saying, "Got reports of seeing people here and there". "Vacationland is nearly totally destroyed".
County Managing Director Wil Okabe says his vacation home in Kapoho Beach Lots is also threatened.
The destruction compounded a magnitude-5.5 natural disaster that rattled parts of the island.
But the Hawaii Civil Defense Agency said the fallout will affect the volcano and Pahala areas, and cautioned about the possibility of aftershocks. It did not cause a tsunami threat, according to the Pacific Tsunami Warning Center.
China sends trade war warning as Donald Trump's tariff deadline looms
Ross gave no details at the start of his meeting Sunday with China's top economic official, Vice Premier Liu He. Ross and the large American delegation had dinner Saturday evening with their Chinese hosts.
Lava is entering the water at the Vacationland tidepools and has inundated most of the subdivision, the Hawaii Volcano Observatory reported after a flyover Tuesday.
Homes in Kapoho Beach Lots and Vacationland are on smaller lots and are closer together than in other parts of the Puna district.
Thousands of residents of the Big Island's Puna district have evacuated since the eruptions began. Officials had issued mandatory orders for residents of Leilani Estates and those in Kapoho Beach and Vacationland to leave by last Friday or risk being trapped and unreachable by emergency crews.
There is NO tsunami threat to Hawaii after a 5.5 (preliminary magnitude 5.6) quake reported at 4:32 a.m. on Tuesday, June 5, 2018 in the Summit Region of the Kilauea Volcano, according to the Pacific Tsunami Warning Center. "Nor can we foresee a summit explosion".
The lava flow, which has destroyed homes in the community of Kapoho and filled in an ocean bay known for snorkeling and tidal pools, is coming from a nearby fissure, which has spouted a fountain of lava that has reached as high as 250 feet in recent days. Laze is formed when hot lava hits the ocean, reacts with sea water and sends hydrochloric acid and steam with fine glass particles in the air.
At the Malama Kī Forest Reserve, forest managers reported that up to half the 1,514 acres have been "impacted" by the eruptions.
"Staff on-site in the release area are prepared to recapture birds and transport them if needed", project manager Jackie Levita-Gaudioso said.