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EARTHQUAKES AND DISASTER PREPAREDNESS

24TH SHDA-HUDCC National Developers ConventionDevelopers Convention

17September 2015

Renato U. Solidum, Jr.Philippine Institute of Volcanology and Seismology

Department of Science and Technology

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The Philippines is prone to many natural hazards due to its geologic and geographic setting

HAZARDSCAPE OF THE PHILIPPINES

Earthquake Tsunami Volcanic eruption

Typhoon Storm surge Flood Landslide

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an average of 20 earthquakes recorded per day

4-5 felt earthquakes per week

PHILIPPINE SEISMICITY

per week

5000 plotted earthquakes per year

90 destructive earthquakes for past 400 years

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How do we prepare for and reduce risks from earthquakes?

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DISASTER IMAGINATION

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• Know Hazards and Risks

<- Hazard and Risk Assessment

• Monitor

KEY ACTIONS FOR DISASTER RISK REDUCTION

<- Monitoring

• Warn and Disseminate Information

<- Communication

• Respond Properly and Timely

<- Mitigation, Preparedness

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How do we prepare for earthquakes?

Know the hazards and potential impacts in your area and impacts in your area and

surrounding ? Determine safe and not safe areas. Avoid unsafe areas

or mitigate potential effects of hazards.

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EARTHQUAKE-RELATED HAZARDS

Ground Shaking LiquefactionFaulting (Ground)

Rupture

Fault

TsunamiFire

Landslide

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EFFECTS OF GROUND RUPTURE

• Rupture damage and collapse of houses, structures on structures on top of fault

• Ruptured roads, bridges

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Earthquake Generators in the Philippines:Active Faultsand Trenches

Active Faults

Trenches

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The Valley Fault System (VFS) in Greater Metro

Manila Areas Atlas

• 33 map sheets• Metro Manila

• 1:5,000 (22 map sheets)• 1:5,000 (22 map sheets)• Laguna and Cavite

• 1:10,000 (10 map sheets)• Bulacan and Rizal

• 1:50,000 (1 map sheet)

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Glorietta from the WVF Using the PHIVOLCS Fault Finder App

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BUFFER ZONE2008 M 7.9 Sichuan, China

Earthquake

Bailu school, looking northeast in direction of rupturePhoto credit to Dr. Gary Gibson

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GROUND SHAKING EFFECTS

Building Collapse Falling Objects

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GROUND SHAKING IN GREATER METRO MANILA (M 7.2 West Valley Fault Earthquake)

(Risk Analysis Project, 2013: PHIVOLCS, GA supported by AusAID)

BULACAN

PAMPANGA

NCRRIZAL

CAVITE

LAGUNA