A 7.1-magnitude earthquake struck off the Philippines on Thursday, the United States Geological Survey reported, briefly triggering a tsunami warning.

The quake hit 63.3 kilometres (39.2 miles) east of Pondaguitan on Mindanao, the country's second largest island, around 1:45 am (1745 GMT) at a depth of 65 km, the USGS said.

A tsunami warning was issued briefly, according to the US Tsunami Warning System, which said the threat had passed around two hours after the quake.

The archipelago is regularly rocked by quakes due to its location on the Pacific "Ring of Fire", an arc of intense seismic activity that stretches from Japan through Southeast Asia and across the Pacific basin.

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Earthquake forecasts move a step closer to reality
Austin TX (SPX) Aug 10, 2021
Earthquakes - like lightning - strike unpredictably. The Earth's tectonic plates, however, hide subtle warnings that a major fault may soon break. Like forecasting a thunderstorm, knowing how to read the warnings could help communities protect lives, infrastructure and local economies. For decades, scientists have struggled to reliably give forecasts for major earthquake hotspots, but now an international team of scientists led by The University of Texas at Austin has embarked on a new initiative ... read more