Understanding the Negros - Cebu, Philippines February 6, 2012 earthquake

Last update: February 9, 2012 at 8:22 am by By

Earthquake overview : an earthquake of magnitude 6.7 occurred in the very highly populated region of Central Visayas in Philippines. The area most damaged is Negros Oriental. Many people have been killed by landslides triggered by the earthquake and the +1,000 aftershocks.
For the most detailed Philippines-only earthquake list and Felt it reports, click here

Read also :  Earthquake Negros - Cebu - many people killed due to landslides and collapsed buildings
Read also : Earthquake Negros - Cebu, Philippines - "I Felt It" reports

Tectonic explanation of what happened

The broad-scale tectonics of the Philippine Islands are dominated by the west-northwest convergence of the Philippine Sea plate with respect to the Sunda plate. This motion, about 10 cm/year at the latitude of the earthquake of February 6, 2012, is accommodated by subduction along the east and west sides of the Philippines Archipelago and by motion of microplates and distributed deformation within the Archipelago.

Historic massive earthquakes in the Philippines (since 1900)

The February 6 earthquake occurred as thrust-faulting within the archipelago. Several earthquakes similar in size to the February 6 earthquake occurred within the archipelago in eastern Negros, Cebu, and Bohol in the twentieth century.

 

In 1948 a magnitude 8.1 earthquake occurred about 150 km to the west of the February 6 earthquake in a zone of shallow seismicity that is associated with subduction along the Negros Trench on west side of the Philippines Archipelago.

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green - Image courtesy USGS

Comments

  1. Skyelar says:

    This is a very helpful tool for my friend and I for our school project. Thank You!
    And also, I feel a deep sorrow for these people amid the quake and for the aftershocks. They are in my prayers.
    ~Skyelar

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