Saturday, September 1, 2012

PHIVOLCS Fault Line Map for Samar Island

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Yesterday (August 31, 2012), an earthquake struck under the sea about 33 kilometers east off the coast of Samar Island. According to United States Geological Center (USGS) the earthquake had a magnitude of 7.6. Tsunami warning were raised for the countries around the Pacific Ocean, which includes the Philippines. Samar was the island that is closest to the epicenter of the earthquake and have the highest risk if tsunami waves were formed.

Thankfully, the earthquake did not generate tsunami waves. Another thing to thank for is that the earthquake did not occur on Samar Island. Much damage might occur if the epicenter of yesterday's is located on land.

There is still a possibility that the next earthquake will occur on Samar Island. Yesterday's earthquake should serve as a reminder to the people of Samar Island that they need to be prepared for calamities due to earthquake.

Philippine Institute of Volcanology and Seismology (PHIVOLCS) prepared maps showing the location of active faults and areas susceptible to liquefaction. Here is the “Active Faults and Liquefaction Susceptibility Map” for Samar Island:
PHIVOLCS Fault Line Map of Samar Island
PHIVOLCS Fault Line Map of Samar Island

This map was extracted from PHIVOLCS' “Active Faults and Liquefaction Susceptibility Map of Region VIII” The link points to a PDF file.

Here is the legend for the map:

Notice that the fault lines on Samar Island can be categorized to three groups, which are the Northern Samar Lineament, Central Samar Lineament and the Southern Samar Lineament.

Notice that the fault line of Central Samar Lieneament passes through Catbalogan City. Those who live in this city should prepare for the possible occurrence of earthquake.

Preparation is the key to safety. I have a blog post that have tips about being prepared for earthquakes and tsunamis.


Some information on this blog post was obtained from GMA News website and PHIVOLCS website.


  1. Tama ka Wrey and Robby.

    Mas malaki ang naging pinsala kung nagkaroon ng tsunami.

  2. What local government agencies are expected to help victims in case of destructive earthquakes? Is there still a need to notify PHIVOLCS with the occurence of an earthquake in a certain area? I think answers to these queries will add info to quake preparedness. Salamat po!

  3. Nicanor

    There is no need to notify PHIVOLCS of the occurence of earthquakes since they have equipments in place to detect tremors. Government agencies have different tasks to help vistims after an earthquake. AFP and Police, for instance have the task of rescuing victims. DOH have the task to send doctors to affected areas. DSWD have the task to bring relief goods.


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