Kilauea could become more explosive, according to the USGS.
Hawaii's erupting Kilauea volcano has been spouting lava "bombs" and threatening escape routes for the people living on Big Island.
"At any time, activity may become more explosive, increasing the intensity of ash production and producing ballistic projectiles near the vent".
"It seems that the system up at the summit has been what we call somewhat open, relieving that pressure", Michelle Coombs, a geologist who is the scientist-in-charge at the Alaska Volcano Observatory, told reporters in Hilo, Hawaii.
For the primary time within the 12-day eruption, residents obtained textual content messages from county officers warning them the ash may trigger eye and respiration irritation.
The unsafe eruptions at Kilauea started earlier this month. It can make roads slippery and large emissions could cause the failure of electrical power lines, said USGS chemist David Damby.
The eruption has taken its toll on the island's tourism industry.
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A thick plume of gray smoke has risen a number of thousand ft above the volcano's summit whereas rockfalls and lava proceed to spew from the cracks.
A wide angle camera view captures the entire north portion of the Overlook crater as the eruption continued at Hawaii's Kilauea volcano. "However, you should expect the possibility of air travel delays/rerouting to avoid the ash plumes", USGS said on Twitter.
The area bearing the brunt of the eruption lies about 25 miles (40 km) down Kilauea's eastern flank, near the village of Pahoa.
This photo from the U.S. Geological Survey shows activity at Halema'uma'u Crater that has increased to include the almost continuous emission of ash with intermittent stronger pulses at Hawaii Volcanoes National Park on the island of Hawaii at around 9 a.m. Tuesday, May 15, 2018.
Officials warned residents to leave the area and get medical attention if they're affected by the gas.
There have been no major injuries or death reported from the eruption.
The ash cloud has reached as high as 10,000 to 12,000 feet above sea level.