People, including the king of Tonga, migrated from coastal areas after the volcano erupted near the Pacific Ocean.
Tonga Pacific Pacific issued a tsunami alert on Saturday after a volcanic eruption, and a video posted on social media shows large waves sweeping along the coast.
Tonga Meteorological Services says tsunami alert is active throughout Tonga. Officials in the nearby region of Fiji also issued a warning, warning people to avoid coastal storms and tsunamis.
An official website at Islands Business reported that a group of police and military personnel had evacuated Tonga King Tupou VI from his palace on the coast. He was one of the many pilgrims who traveled there.
The eruption of Mount Hunga Tonga-Hunga Ha’apai was spectacular.
Twitter user Dr Faka’iloatonga Taumoefolau posted a video showing the waves crashing ashore.
“I could hear the volcanic eruption,” he wrote, adding, adding: “Ashes and hailstones, darkness covered the sky.”
Earlier, the Matangi Tonga newspaper reported that scientists had observed a massive explosion, thunder and lightning near the volcano on Friday morning.
The site reported that satellite images show ash, steam and 5km-wide (3-mile) air that rises to about 20km (12 miles).
Over 2,300 miles[1,400 km]from New Zealand, authorities warned of the approaching hurricane.
The National Emergency Management Agency said some parts of New Zealand could expect “strong and unusual waves as well as unpredictable coastal waves after a major volcanic eruption”.
Late Saturday, the Pacific Tsunami Warning Center said the threat in American Samoa appeared to be over, although minor maritime tensions could continue.