Hawaii’s tourism industry has taken a $5 million hit as Kilauea volcano continues to blanket Big Island with destructive lava.

Cancellations from May through June have soared ever since the volcano started erupting earlier this month and bookings for hotels and tourism activities — including lava viewing, zip lines and glass bottom boats — have slumped 50 percent, according to Ross Birch, executive director of the island’s tourism board.

He said it’s the “first leak we’re seeing out of the bucket.”

Hawaii relies on tourism as one of its most lucrative industries: Big Island raked in about $2.5 billion last year in visitor spending.

Big Island is roughly the size of Connecticut and draws 1.5 million to 1.7 million tourists annually, according to website Guide of US Hawaii.

Fiery lava has engulfed the island since Kilauea began erupting May 3, forcing nearly 2,000 residents to evacuate. More than two dozen homes have been destroyed.

On Monday, a new fissure spewing lava and emitting toxic gases opened up and the National Weather Service warned of “light ashfall” in Kau after a burst of volcanic emissions around 9 a.m.

Nearly 20 fissures have opened in and around the Lanipuna Gardens and Leilani Estates neighborhoods.

Molten rock that’s been flowing from a crack that opened Sunday is headed toward the ocean about 2 miles away, according to the US Geological Survey’s Hawaiian Volcano Observatory.

Richard Schott, 34, watched as lava bubbled over a ridgeline behind some trees.

“I’ve actually seen rocks fly over the tree line, and I can feel it in my body,” Schott told the Associated Press. “It’s like a nuclear reaction or something.”

With Post wires