A magnitude 7.8 earthquake struck the southern Philippines near Mindanao this morning, shaking the region at 11.37am local time and prompting Pacific authorities to check for any tsunami threat. The quake hit at a depth of 35km, putting it firmly in the category of events that can send waves across the region.
New Zealand’s National Emergency Management Agency and GNS Science were among those assessing whether the philippines earthquake had generated a tsunami that could reach New Zealand. The Pacific Tsunami Warning Center issued a tsunami advisory for the Philippines, Malaysia, Guam, Indonesia, Palau, Yap, Taiwan and Papua New Guinea, widening the scope of concern well beyond the epicentre.
The reason the alerting moved so quickly is that the quake struck at the southern end of the Philippine archipelago, near Mindanao, the country’s second-largest and southernmost island group. In that setting, a strong offshore tremor can affect a wide stretch of coastline, and emergency agencies moved fast enough that the first hours after the quake were spent on modelling and monitoring rather than on any confirmed reports of damage or waves.
That uncertainty mattered because the event was strong enough to trigger tsunami assessments, but not strong enough yet to answer the central question: whether it had actually produced a tsunami at all. NEMA said that if a tsunami had been generated in that location, it was not likely to arrive in New Zealand for at least 10 hours, buying time for more data but not removing the need for a watchful response.
NEMA also said its national advisory followed a rapid assessment of preliminary earthquake information and that the situation could change as more information became available. The agency said it would issue an update after completing a further assessment, leaving the next official judgment on the wave risk to later in the day.
The Philippines’ south has been hit hard before. Last year, two large earthquakes struck the region, including a magnitude 6.9 tremor in late September and a magnitude 7.4 quake a week later. That recent history is part of why a new strong quake near Mindanao is being taken seriously across the Pacific, even before the question of a tsunami is settled.
For now, the event has moved from a local earthquake into a regional monitoring exercise. The next update from New Zealand authorities will determine whether the morning’s quake stayed beneath the sea as a powerful shock or added another tsunami scare to a part of the Pacific that has already lived through more than its share of them.
