Scientists think Tonga's record-breaking 2022 eruption was triggered by gas building up to a "critical point" rather than by a reaction between magma and seawater as previously assumed.

Saturday's lively Tonga Day festival featured dancing, food and an opportunity for Oregon's Tongan community to celebrate their culture.

An underwater volcano erupted in January near the Pacific nation of Tonga and sent massive pressure waves racing through Earth's atmosphere, where they lapped the planet several times.