CEBU CITY, Philippines — The magnitude 7.8 earthquake that struck offshore Sarangani on Monday, June 8, 2026, could also be linked to motion alongside the Cotabato Trench, in line with the Philippine Institute of Volcanology and Seismology (Phivolcs).
The earthquake occurred at 7:37 a.m. Philippine Commonplace Time.
Phivolcs traced the epicenter 32 kilometers west of Maasim, Sarangani. The quake had an estimated depth of 33 kilometers.
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What brought on the earthquake?
Phivolcs mentioned the quake’s location, focal mechanism, and aftershock sample level to subduction alongside the Cotabato Trench.
However what does this imply?
The Cotabato Trench is a serious earthquake-generating construction off the coast of Mindanao.
In easy phrases, a trench is an space the place one a part of the Earth’s crust strikes beneath one other. Scientists name this course of subduction.
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When strain builds up underground, rocks can all of the sudden transfer. That sudden motion causes an earthquake.
Why Sarangani is quake-prone
Sarangani and close by provinces sit close to a seismically lively space.
Phivolcs mentioned Sarangani faces the Cotabato Trench. The realm additionally has close by native faults. A few of these faults could also be hidden below current deposits.
These buildings can generate minor to nice earthquakes.
Aftershocks could proceed
As of 11 a.m. on June 8, Phivolcs recorded 138 aftershocks from the magnitude 7.8 earthquake.
The aftershocks ranged from magnitude 1.3 to magnitude 6.7.
Phivolcs mentioned aftershocks could proceed for a number of days to weeks. Some should be felt in close by provinces.
Tsunami waves recorded
The earthquake additionally triggered tsunami waves in some coastal areas.
Phivolcs recorded waves of about one meter alongside the coasts of Kiamba and Maasim in Sarangani, and Kalamansig in Sultan Kudarat.
The company additionally recorded smaller tsunami waves in Mati Metropolis and Zamboanga Metropolis.
Phivolcs reminded coastal communities to observe for pure indicators of an area tsunami. These embody sturdy shaking, a sudden rise or fall of seawater, and a roaring sound from incoming waves.
Residents ought to transfer to larger floor instantly in the event that they observe these indicators.
Not linked to volcanic exercise
Phivolcs mentioned the earthquake was tectonic in origin.
This implies motion within the Earth’s crust brought on the quake. It was not attributable to volcanic exercise.
Matutum and Parker volcanoes are the closest lively volcanoes to Sarangani. Nonetheless, Phivolcs mentioned the earthquake doesn’t point out volcanic exercise.
The company urged the general public to arrange for aftershocks, keep away from broken buildings, and comply with updates solely from DOST-Phivolcs and different authorities.
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