2010 Mindanao earthquakes

2010 Mindanao earthquakes
UTC time ??
ISC event
USGS-ANSS
Date * July 23, 2010
Origin time * 22:51:11 UTC
Local date
Local time
Magnitude 7.6 Mw
Depth 578.0 km (359 mi)
Epicenter 6°29′49″N 123°28′48″E / 6.497°N 123.480°E / 6.497; 123.480Coordinates: 6°29′49″N 123°28′48″E / 6.497°N 123.480°E / 6.497; 123.480
Areas affected Philippines
Foreshocks 7.3 Mw July 23 at 22:08:11
Aftershocks 7.5 Mw July 23 at 23:15:10
* Deprecated  See documentation.

The 2010 Mindanao earthquakes occurred in the southern Philippines in the Moro Gulf. The sequence of events took place over several days in late July, and consisted of three primary shocks that were all over M7, but there were no reports of damage or casualties as they occurred far too deep (over 500 kilometres (310 mi)) to pose any serious threat.[1]

Tectonic summary

The southern part of the Philippines lies above the complex collisional zone between the Philippine Sea Plate and the Sunda Plate. The convergence between these two plates of between 6–11 cm per year is accommodated by a series of smaller plates. One of these, the Molucca Sea Plate, is currently being subducted beneath both the Philippine Sea Plate and the Sangihe Microplate, causing it to have an inverted U-shape seismic zone. The earthquakes were caused by the continuing distortion of the Molucca Sea Plate.[2] These three quakes of similar magnitude occurring in such close proximity of each other location-wise and time-wise can be regarded as an example of a triplet earthquake.

Areas affected

These earthquakes occurred in Moro Gulf, off the island of Mindanao. The Mw 7.6 earthquake were felt in Philippines, Taiwan, and Malaysia. The Mw 7.4 earthquake were felt in Philippines, Brunei, Malaysia, and Indonesia.

References

  1. ↑ (2010 August–September). "PHIVOLCS Observer", pg. 4. Philippine Institute of Volcanology and Seismology. Retrieved on 2012-04-23.
  2. ↑ USGS (26 July 2010). "M7.3, 7.6, 7.4 Moro Gulf, Mindanao, Philippines Earthquakes of 23 July 2010" (PDF). Retrieved 30 April 2012.
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