PAHOA, Hawaii — Fresh volcanic eruptions on the southern end of the island of Hawaii after a series of tremors left residents displaced and frightened as the authorities evacuated the state’s largest park on Friday and worked to keep people out of two subdivisions that had been evacuated.

Following days of small earthquakes, a more powerful one with a magnitude of 6.9 hit the south flank of the volcano at 12:33 p.m. Hawaii time. There was no tsunami expected, according to a statement from the Pacific Tsunami Warning Center, but “many areas may have experienced strong shaking.”

That earthquake, which set off rock slides on park trails, forced park officials to close down and evacuate Hawaii Volcanoes National Park, which encompasses 333,000 acres — 13 percent of the Big Island’s total area. Closing the park is a rare occurrence, Jessica Ferracane, a spokeswoman for the park, said on Friday afternoon.