In this April 21, 2018 photo, the slowly rising lava lake at Kilauea's summit continued to overflow intermittently out of its Overlook crater onto the floor of Halemaumau Crater, in Hawaii Volcanoes National Park. It was the largest recorded overflow since the summit vent opened up 10 years ago. 

Lava spatters at the edge of Kilauea's Halemaumau Crater in Hawaii Volcanoes National Park on Hawaii's Big Island, April 22, 2018. 

Beginning Saturday, April 21 at around midnight, Kīlauea Volcano's summit lava lake rose high enough that lava briefly spilled onto the floor of Halema'uma'u. Four more overflows occurred on April 22- 23. The largest pulse covered a third of the crater floor with shiny black lava.

Here, Hawaiian Volcano Observatory geologists use a laser range-finder to measure the depth to the lava lake surface at its peak level, on April 23, 2018. Mauna Loa is visible in the distance (left). 

The large overflow of a lava lake in Kilauea Volcano in Hawaii Volcanoes National Park on Hawaii's Big Island, April 23, 2018. 

Dozens of earthquakes rattled the area as magma flowed into a new area east of the Pu'u 'Ō'ō vent.

Lava flowing over Mohala Street in the Leilani Estates area near Pahoa on the Big Island of Hawaii, May 4, 2018. 

Kilauea Volcano's summit lava lake overflows onto Halemaumau Crater in Hawaii Volcanoes National Park on Hawaii's Big Island, April 24, 2018.

A layer of red ash rests on top of an active lava flow, with brilliant surface breakouts visible, at Kilauea Volcano in Hawaii Volcanoes National Park, April 30, 2018. 

A small lava flow - lighter in color - erupts from a section of the crack on the west flank of Pu'u 'Ō'ō, May 1, 2018.

On the morning of May 3, as HVO geologists were working on Pu'u 'Ō'ō, a magnitude-5.0 earthquake struck the area around the cone, collapsing the crater of Pu'u 'Ō'ō and creating a reddish-brown ash plume.

A plume of ash rises from the Pu'u 'Ō'ō crater on Hawaii's Kilaueaa Volcano, Thursday, May 3, 2018 in Hawaii Volcanoes National Park. Kilauea erupted on Thursday, sending lava shooting into the air in a residential neighborhood and prompting mandatory evacuation orders for nearby homes. 

Hawaii County said steam and lava poured out of a crack in Leilani Estates, which is near the town of Pahoa on the Big Island.

A plume of ash rises from the Pu'u 'Ō'ō vent on Hawaii's Kilaueaa Volcano Thursday, May 3, 2018 in Hawaii Volcanoes National Park. 

Hawaii County said steam and lava poured out of a crack in Leilani Estates, which is near the town of Pahoa on the Big Island.

An ash plume rises above the Pu'u 'Ō'ō vent, on Hawaii's Kilauea Volcano Thursday, May 3, 2018 in Hawaii Volcanoes National Park. Nearly 1,500 residents were ordered to evacuate from their volcano-side homes after Kilauea erupted, sending molten lava to chew its way through forest land and bubble up on paved streets. 

White, hot vapor and blue fumes emanate from a cracked area within the Leilani Estates subdivision, with lava flowing in the eastern end of the subdivision, in the lower East Rift Zone of Kīlauea Volcano, May 3, 2018,

Lava erupts along a road in Leilani Estates, Puna, Hawaii, May 3, 2018, in this image taken from a social media video. 

Red Cross volunteers sit at the entrance of an evacuation shelter, Friday, May 4, 2018, in Pahoa, Hawaii. Residents at a nearby neighborhood were forced to evacuate their homes due to a lava eruption in the area.

An ash cloud rises above Kilauea Volcano after it erupted, on Hawaii's Big Island May 3, 2018, in this photo obtained from social media. 

The Kilauea Volcano fissure that formed on the west flank of the Pu'u 'O'o cone is seen in this aerial image after the volcano erupted following a series of earthquakes over the last couple of days, in Hawaii, May 3, 2018. 

Lava emerges from the ground after Kilauea Volcano erupted, on Hawaii's Big Island May 3, 2018.

Results of the eruption from Kilauea Volcano on Hawaii's Big Island Friday, May 4, 2018. The eruption sent molten lava through forests and bubbling up from paved streets, forcing the evacuation of about 1,500 people.

Residents from the nearby Leilani Estates sleep in their cars after being forced out of there homes by a lava eruption, Friday, May 4, 2018, in Pahoa, Hawaii.

Authorities detected high levels of sulfur gas that could threaten the elderly and people with breathing problems.

Cracked pavement is seen after the eruption of Kilauea Volcano on Hawaii's Big Island Friday, May 4, 2018. 

A view of the erupting Kilauea volcano Friday, May 4, 2018, in Kalapana, Hawaii.

A large earthquake struck Hawaii's Big Island near the site of a volcanic eruption that has forced residents to evacuate from their homes.

Steaming cracks on Leilani Street. The crack in the foreground opened during the May 4 magnitude 6.9 earthquake that struck the island.

According to the U.S. Geological Survey, the earthquake "is directly associated with volcanic activity at Kilauea volcano, and the evolution of its rift system and volcanic edifice."

Shortly after the earthquake on Friday, a plume of reddish-brown ash occurred at Kilauea.

A fissure at Leilani and Kaupili Streets in the Leilani Estates subdivision on the morning of Friday, May 4, 2018. The lava was approximately two meters thick.

In this still frame taken from video, lava flows toward a home in the Puna District as a result of the eruption from Kilauea Volcano on Hawaii's Big Island, Friday, May 4, 2018.

On Saturday, May 5, 2018, lava slowly advances within the Leilani Estates neighborhood. Eight fissures - each several hundred feet long - have opened in the area since Thursday. 

Volcanic gases pour out of a fissure in the Leilani Estates, Saturday, May 5, 2018, in Pahoa, Hawaii. The Hawaiian Volcanoes Observatory said eight volcanic vents opened in the Big Island residential neighborhood since Thursday. 

Officials warned that masks sold in stores were not sufficient protection for the dangerous gases being released, including sulfur dioxide.

Lava creeps across the road in the Leilani Estates, Saturday, May 5, 2018, in Pahoa, Hawaii. The Leilani Estates area is at the greatest risk for more lava outbreaks.

Lava burns across the road in the Leilani Estates in Pahoa, Hawaii, Saturday, May 5, 2018. 

Lava glows from a vent on a lava bed at the Leilani Estates, Saturday, May 5, 2018, in Pahoa, Hawaii. 

A fissure erupts Saturday evening at Leilani Estates, with fountains spraying lava as high as 230 feet.

Hundreds of anxious residents on the Big Island of Hawaii hunkered down Saturday for what could be weeks or months of upheaval as the dangers from an erupting Kilauea volcano continued to grow. Officials on Sunday said 26 homes have been destroyed.