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Laoag City is near the Vigan-Aggao Fault and the West Ilocos Fault System, both part of the seismically active Philippine Fault Zone. The proximity of these faults poses significant seismic hazards, as evidenced by historical earthquakes like the 1983 magnitude 6.5 event, which caused considerable damage. Effective urban planning and disaster preparedness are essential to mitigate the risks associated with potential earthquakes.

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Rona Joy Sumalin
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26 views2 pages

Document 14

Laoag City is near the Vigan-Aggao Fault and the West Ilocos Fault System, both part of the seismically active Philippine Fault Zone. The proximity of these faults poses significant seismic hazards, as evidenced by historical earthquakes like the 1983 magnitude 6.5 event, which caused considerable damage. Effective urban planning and disaster preparedness are essential to mitigate the risks associated with potential earthquakes.

Uploaded by

Rona Joy Sumalin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Seismic Hazard: Using the PHIVOLCS Fault Finder, show the nearest fault and discuss the

possible impact to the city.

Laoag City in Ilocos Norte is situated near several active fault systems, notably the Vigan-Aggao
Fault and the West Ilocos Fault System. These faults are part of the broader Philippine Fault
Zone, which is known for its seismic activity.

Nearest Active Faults to Laoag City

 Vigan-Aggao Fault (VAF): This is a significant left-lateral strike-slip fault that stretches
approximately 140 kilometers through northwestern Luzon. It makes several segments,
including the Batac-Laoag bend, which lies close to Laoag City.

 West Ilocos Fault System: This fault system is about 8.6 kilometers from the Ilocos Norte
Capitol in Laoag City, indicating its proximity to the city center.

Potential Impact on Laoag City

Given the proximity of these active faults, Laoag City faces significant seismic
hazards. Historical events, such as the 1983 magnitude 6.5 earthquake, have proven the potential
for substantial ground shaking, infrastructure damage, and secondary hazards like landslides in
the region.
The presence of these faults needs rigorous urban planning and disaster preparedness
measures. Structures should be designed to withstand seismic forces, and emergency response
plans must be in place to mitigate the impact of potential earthquakes.

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