Wednesday, 21 October 2015

Magnitude 5.8 Earthquake under southwestern Luzon Island, the Philippines.

The United States Geological Survey recorded a Magnitude 5.8 Earthquake at a depth of 106 km beneath southwestern Luzon Island in the Philippines, at about 9.50 pm local time (about 1.50 pm GMT) on Monday 19 October 2015. There are no reports of any damage or injuries associated with this event, though it was felt across much of the southwestern part of Luzon. This is typical for such large deep earthquakes; releases of energy that would be deadly close to the surface have spread over a wide area before reaching ground level, so that they are felt over a wide area but not particularly dangerous.

The approximate location of the 19 October 2015 Luzon Earthquake. Google Maps.

The geology of the Philippines is complex, with the majority of the islands located on the east of the Sunda Plate. To the east of this lies the Philippine Sea plate, which is being subducted beneath the Sunda Plate (a breakaway part of the Eurasian Plate); further east, in the Mariana Islands, the Pacific Plate is being subducted beneath the Philippine Sea Plate. This is not a smooth process, and the rocks of the tectonic plates frequently stick together before eventually being broken apart by the rising pressure, leading to Earthquakes in the process.

Subduction beneath the Philippines. Yves Descatoire/Singapore Earth Observatory.

See also...

Mount Bulusan, a 1565 m stratovolcano (cone shaped volcano made up of layers of ash and lava) on the southern tip of the Bicol Peninsula on Luzon Island, in the Philippines, began erupting slightly after 9.45 am local time on Friday 1 May 2015, with a small...

The United States Geological Survey recorded a Magnitude 5.3 Earthquake at a depth of 10 km about 37 km off the east coast of Luzon Island in the...


The Philippine Institute of Volcanology and Seismology has recorded an increase in seismic activity over the past 24 hours (Saturday 28-Sunday 29 June 2014) beneath Mount Mayon, a 2463 m stratovolcano (cone shaped volcano) on southern Luzon Island. White smoke has also been seen...


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