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May 19, 2015
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You've probably heard the news: a big earthquake is supposed to hit Metro Manila soon. With Nepal being shook to its core after two big planet-shakers, it's probably best for our country to heed the advice of the experts and keep ourselves informed and prepared for such a disaster.

Your first step? Get up to speed with the core details of this catastrophe-in-the-making. Here's what you should know:

 

1) There are currently two active faults in the Greater Metro Manila area that are ripe for earthquakes.

These are the East Valley Fault (EVF) and the West Valley Fault (WVF). The EVF is a 10-kilometer long fault that passes through Rizal Province, including the municipalities of San Mateo and Rodriguez.The WVF is longer at 100 kilometers long and runs from Bulacan to Laguna.

 

2) These two faults have been quiet for hundreds of years. 

Based on their research, the Valley Fault System is now ticking like a massive time bomb and is due for a huge earthquake within the next 50 years. The WVF is notorious for generating heavy quakes every 400 to 600 years, and the last one happened 357 years ago, sometime in 1658. This means that we just might experience the next big one in our lifetime.

 

3) The WVF can generate a 7.2-magnitude earthquake while the EVF can generate a weaker but still significant 6.2-magnitude earthquake.

For reference, the 2011 Japan earthquake that generated city-wiping tsunamis was a magnitude-9.0. It led to over 20,000 deaths. The Haiti earthquake in 2010 was a weaker magnitude-7.0 but led to 316,000 deaths. The recent one in Nepal was a magnitude-7.8 quake, which led to more than 8,000 deaths.

Closer to home, a 7.2-magnitude quake hit Bohol in October 2013, which resulted in 200 deaths and damages totalling up to P2.2 billion. This is one scene from that incident:

Photo via Wikipedia

 

4) The population density in Metro Manila could result in bigger damages. 

A PHIVOLCS study states that there could be at least 33,500 fatalities, 100,000 injured, and total damage costs of P2.3 trillion.   


5) PHIVOLCS has released a map system that pinpoints the places that are most at risk.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) released The Valley Fault System Atlas yesterday morning, May 18, to help us prepare and protect ourselves in case the catastrophic scenario happens. It is composed of 33 maps of cities that are under the East Valley Fault and West Valley Fault and can be downloaded from the PhilVolcs website.

You can also look at it here:

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   The Valley Fault System Atlas

It uses the most recent official maps available from the National Mapping Resource Authority (NMRA) and have been done in 1:5,000 scale which shows actual streets, villages and even outlines of a few structures that can definitely help authorities and even the common public to determine the areas in great risk.

 

6) A full list of barangays that are traversed by the Valley Fault System has been listed by GMANetwork.com.

They are as follow:  

WEST VALLEY FAULT

Metro Manila

Quezon City:

    Bagong Silangan
    Bagumbayan
    Batasan Hills
    Blue Ridge B
    Libis
    Matandang Balara
    Pansol
    White Plains
    Ugong Norte
    Loyola Heights
    Pasong Putik Proper (Pasong Putik)
    Payatas

Marikina City:

    Barangka
    Industrial Valley
    Malanday
    Tumana

Pasig City:

    Bagong Ilog
    Ugong

Makati City:

    East Rembo
    Pembo
    Rizal
    Comembo

Taguig City:

    Bagumbayan
    Bagong Tanyag
    Upper Bicutan
    Central Bicutan
    Lower Bicutan
    Maharlika Village
    Pinagsama
    North Signal Village
    Central Signal Village
    South Signal Village
    Ususan
    South Daang Hari

Muntinlupa City:

    Alabang
    Bayanan
    Buli
    Cupang
    Poblacion
    Putatan
    Sucat
    Tunasan

Outside Metro Manila

Bulacan:

San Jose Del Monte City:
        San Isidro
        Ciudad Real
        San Roque

Norzagaray:
        San Lorenzo
         
Doña Remedios Trinidad:
        Camachin
        Kabayunan
        Sapang Bulak
        Bayabas
        Camachile
        Pulong Sampalok

Laguna:

San Pedro:
        Calendola
        Gsis
        Sampaguita Village
        San Antonio
        San Vicente
        Riverside
        United Bayanihan

Biñan:
        Biñan (Poblacion)
        Malamig
        San Francisco (Halang)

Sta. Rosa:
        Sto Domingo

Cabuyao:
        Casile

Calamba:
        Canlubang

Cavite:

Gen. Mariano Alvarez:
        San Jose

Carmona:

        Bancal
        Cabilang Baybay
        Lantic
        Mabuhay

Silang:
        Carmen
        Inchican

EAST VALLEY FAULT

Rizal:

San Mateo:
        Ampid I
        Dulongbayan Ii
        Guinayang
        Guitnangbayan Ii
        Malanday
        Maly
        Santa Ana

Rodriguez (Montalban):
        Burgos
        Macabud
        San Jose
        San Isidro
        San Rafael (Rosario)

 

Since we really can't prevent Mother Nature's fury from happening, hopefully, the Fault Atlas can help us prepare for the worst case scenario.

Scroll down below for a closer look:

PASIG AND MAKATI AREA

If our topography-reading skills serve us right, then the quake will most likely affect the areas between Pasig Boulevard and C-5. Given its fair share of high-volume traffic and the Origas-C5 flyover just hundreds of meters away from the active fault line in red, it'll definitely be a danger zone, especially for motorists should the earthquake start here.

MAKATI AND TAGUIG CITY

We're no engineering experts, but it seems that ominous red line is really on its track to C-5 straight to the outskirts of Makati City.

PASIG CITY

Valle Verde residents should really take note about this one as the diagram illustrates that  almost the whole community is laying on top of not just two, but three active fault lines.

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QUEZON CITY AND MARIKINA CITY

Those two huge cities aren't only divided by authoritative division and jurisdiction, they're also traversed by three active fault lines!

There's no saying when the earthquake will hit—if it ever does—but the smart money here is to not disregard these warnings, and use whatever information we have to decrease the quake's potential for destruction. We've been caught offguard by so many typhoons that by now, we should be more vigilant when it comes to potential disasters like these.

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