Sunday, October 27, 2013

Earthquake and Metro Manila

(Check map here - http://www.phivolcs.dost.gov.ph/html/update_SOEPD/hazard_maps/active_faults/VFS/marikina.pdf )


After a magnitude of 7.2 earthquake struck Bohol on October 15, 2013 at 8:12 a.m. (PST), earthquake as a topic has become so prominent again. With the devastation that happened in Bohol, should a similar earthquake magnitude occurs in Manila, such calamity would be so unprecedented given the city's million population.

In 2002 it was a study was started  on the Earthquake Impact Reduction Study for Metropolitan Manila, Republic of the Philippines, and in 2004  a Final Report  was made. The report below was culled from this document -
http://www.phivolcs.dost.gov.ph//images/attachments/article/419/E_SUMMARY_01.PDF

The objective of the study was : "The earthquake impact reduction plan for Metropolitan Manila prepared by the Metropolitan Manila Earthquake Impact Reduction Study anticipates the mitigation and reduction of the expected impact.The vision of this plan is to ultimately achieve  A Safer Metropolitan Manila from Earthquake Impact.”

Consider this earthquake scenario from the study:

Analyzing past historically recorded earthquakes and instrumentally recorded earthquakes, a total 18 earthquakes were selected as scenario earthquakes, which have potential damaging effect to Metropolitan Manila; also earthquake ground motion, liquefaction potential, slope stability and tsunami height are estimated.

Finally three models namely, 

  • Model 08 (WestValley Faults M.7.2),
  • Model 13 (Manila Trench M.7.9), 
  • Model 18 (1863 Manila Bay M.6.5),

were selected for detail damage analysis because these scenario earthquakes show typical and severe damages to Metropolitan Manila.

Model 08, as the worst case

  • 170,000 residential houses will collapse,
  • 340,000 residential houses will be partly damaged, 
  • 34,000 persons will die, 
  • 114,000 persons will be injured.


Fire will breakout and burnt approximately 1,710 hectares and totally 18,000 additional persons will be killed by this secondary disaster. Moreover, infrastructures and lifelines will also be heavily damaged.




Source -  http://www.phivolcs.dost.gov.ph//images/attachments/article/419/E_SUMMARY_01.PDF

Well I just hope that most of us living here in Metropolitan Manila are properly informed about these scenarios and are educated on what to do in case this would happen.  With the use of social media I hope that there would be infographics and educational videos that will be made to educate and inform the public and hope news media and telcos would do their share to promote awareness and disaster mitigation.

In 1990s when I was a high school I had an experience of a powerful earthquake and its aftershocks, the fear and trauma is still vivid and now living again in the city and in a high rise building I hope I will be more capable in handling if such situation would occur, especially the BIG ONE that many have been anticipating. Hope it will never come.




Related Post:
http://peterahon.blogspot.com/search?q=earthquake+preparedness


Maps

Philippine faults
http://www.phivolcs.dost.gov.ph/index.php?option=com_content&view=article&id=78&Itemid=500024

Fault in our neighborhood
http://www.phivolcs.dost.gov.ph/html/update_SOEPD/hazard_maps/active_faults/VFS/marikina.pdf


History of earthquakes in the Philippines
http://en.wikipedia.org/wiki/List_of_earthquakes_in_the_Philippines


News report on the earthquake (un)readiness of Manila:

http://newsinfo.inquirer.net/509257/study-37000-may-die-if-7-2-quake-would-hit-metro-manila
http://www.rappler.com/nation/41764-prepared-metro-manila-strong-quake 

http://z6.invisionfree.com/flipzi/index.php?showtopic=597&view=getnewpost

Check Phivolcs FB page here -
https://www.facebook.com/PHIVOLCS?ref=stream

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