HONOLULU  — Earthquakes were damaging roads and buildings on Hawaii’s Big Island on Wednesday as ash emissions streamed from Kilauea volcano.

The strongest shaking was recorded around 8:30 a.m., measured as a 4.4-magnitude earthquake. The floor of the summit crater has also dropped about three feet (90 centimeters), as the threat of a strong, explosive eruption at the top of the volcano loomed.

Ash spewed from the summit at Hawaii’s Kilauea volcano, though emissions decreased from Tuesday.

Lava shoots into the night sky from active fissures on the lower east rift of the Kilauea volcano, Tuesday, May 15, 2018, near Pahoa, Hawaii. (AP Photo/Caleb Jones)

Lava shoots into the night sky from active fissures on the lower east rift of the Kilauea volcano on Tuesday near Pahoa, Hawaii. (AP Photo/Caleb Jones)

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There were occasional bursts of ash coming from the crater causing ash to fall downwind to several communities, though there were only trace amounts, said the Hawaiian Volcano Observatory. Ash plumes on Tuesday had spouted as high as 12,000 feet into the air, scientists said.

These plumes are separate from the lava eruptions happening roughly 25 miles away from summit, where about 20 lava fissures have destroyed more than two dozen homes and forced the evacuation of about 2,000 residents.

Dense, large rocks roughly two feet in diameter were found in a parking lot a few hundred yards away from Kilauea’s summit crater, which reflect the “most energetic explosions yet observed and could reflect the onset of steam-driven explosive activity,” the Hawaiian Volcano Observatory said in a statement, and continues to monitor activity.

Scientists say earthquakes may shake loose rocks underground and open up new tunnels for lava to flow.

Cracks formed on a highway near the entrance to Hawaii Volcanoes National Park, said the Hawaii Police Department. Much of the park remains closed.

“We’re all safe, and I wish they’d open the park back up, but they have to keep it safe for everybody,” said Ken McGilvray, an area resident. “We live on a volcano!”

Tommie Joy Higgins of Hawaiian Paradise Park, Hawaii, stands on an old lava flow from 2014 as she watches plumes of volcanic gases rise from nearby active lava fissures on Tuesday, May 15, 2018 in Pahoa, Hawaii. (AP Photo/Caleb Jones)

Tommie Joy Higgins of Hawaiian Paradise Park, Hawaii, stands on an old lava flow from 2014 as she watches plumes of volcanic gases rise from nearby active lava fissures on Tuesday. (AP Photo/Caleb Jones)

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Hawaii Gov. David Ige said the state is forming a joint task force that could handle mass evacuations of the Big Island’s Puna district if lava from Kilauea volcano covers major roads and isolates the area. The troops may be needed for emergency evacuations, search and rescue, clearing debris and other duties.

On Tuesday, the volcano discharged ash because of rocks falling into the summit, U.S. Geological Survey geophysicist Mike Poland said.

“There is very little wind at the summit,” he said. “The plume, it’s not near as ashy as it was yesterday, and it’s rising more or less vertically over the summit region.”

Because of the ash, USGS scientists operated from a backup command center at the University of Hawaii at Hilo.

Poland did not have an immediate height on the plume Wednesday since scientists were not staffing the observatory at the summit. They will have to rely on remote observations, he said.

“Things seem to be progressing largely as they have been, except for a shift in wind and less ash,” Poland said.

Scientists remained on alert for more violent activity. Geologists have warned that the summit could have a separate explosive steam eruption that would hurl huge rocks and ash miles into the sky. But it’s not certain when or if that might happen.

For those on the ground near the lava vents, health warnings were issued because of dangerous volcanic gases.

An air-quality alert was in effect for an area near the Lanipuna Gardens subdivision. That area was evacuated shortly after the eruption began May 3. Most fissures are in that subdivision or the adjoining Leilani Estates neighborhood.

Several fissures remained active Wednesday, producing lava spatter. Lava from one fissure that had been clearing a path toward the ocean, about 2 miles away, had not advanced in the last 24 hours.

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