M7.8 offshore southern Mindanao, Phillipines

[davenn]

Off my Sydney seismo this morning ......

M 7.8 - 26 km SW of Kablalan, Philippines​

• • 2026-06-07 23:37:41 (UTC)
  • 5.592°N 125.047°E
  • 55.2 km depth

High gain and low gain sensors

 

[Astronuc]

55.2 km depth

Fortunately, moderately deep.
https://earthquake.usgs.gov/earthquakes/eventpage/us7000srb1/executive

A 6.5 Mag aftershock in the same region at a greater depth
https://earthquake.usgs.gov/earthquakes/eventpage/us7000srcg/executive

M 6.5 - 19 km SW of Balangonan, Philippines​

• 2026-06-08 00:55:12 (UTC)
• 5.472°N 125.205°E
• 65.6 km depth

A 6.0 Mag aftershock on land
https://earthquake.usgs.gov/earthquakes/eventpage/us7000src3/executive

M 6.0 - 4 km ENE of Pangyan, Philippines​

• 2026-06-07 23:49:13 (UTC)
• 5.715°N 125.320°E
• 35.0 km depth

https://earthquake.usgs.gov/earthquakes/eventpage/us7000srbe/executive

M 6.0 - 16 km WSW of Balangonan, Philippines​

(close to the 6.5 Mag site)

• 2026-06-07 23:48:11 (UTC)
• 5.522°N 125.210°E
• 81.8 km depth

All quakes on land or off the coast of the southern tip of Mindanao Island, Philippines.

 

[Astronuc]

The Mag 7.8 earthquake was the strongest so far this year. I heard some discussion of the geological consequences yesterday on a BBC broadcast.

Over 6,000 aftershocks have been recorded following the massive quake as of 11am local time, the Philippine Institute of Volcanology and Seismology (Phivolcs) said on Monday.
. . . .

Residents reported a geological phenomenon known as “coastal uplift” after the quake, with the shoreline extending by as much as 200 metres in many places.

During the earthquake, the Cotabato trench off the southwestern coast of Philippines “pushed part of the coastlines of Sarangani and Davao [provinces]” and exposed the seabed that was originally submerged, Phivolcs said.

The seabed uplift has been estimated to be about 2 metres.

“Preliminary field observations indicate approximately 2 metres of coastal uplift and about 200 metres of shoreline retreat,” Phivolcs said.

In several regions, “formerly submerged corals are now exposed”, the agency said, adding that coastal landslides were also observed between the municipalities of Barangays Burias and Glan in Sarangani.

Images released by Phivolcs show large numbers of corals, seagrass, dead fish and other aquatic life on the exposed seafloor.

https://www.the-independent.com/new...eabed-raise-shoreline-extension-b2995719.html

The Independent reports that 61 people were killed and injuring hundreds. Other media report thousands of structures collapsed or severely damaged, and about 20,000 people are displaced.

Movement of the Cotabato Trench also caused the 1976 Moro Gulf earthquake and tsunami, which killed 8,000 people.

Seismic activity along the boundaries of the Philippine Sea Plate has produced seven major earthquakes of magnitude greater than 8, and 250 large ones of over 7 magnitude, as well as a number of tsunami-generating events, according to the US Geological Survey.