THE BIG ONETHE MAGNITUDE 7.2 WEST VALLEY FAULT EARTHQUAKE Kristian M. Azul

Assistant Professor

Institute of Civil Engineering

University of the Philippines Diliman

Image Landsat / CopernicusData SIO, NOAA, U.S. Navy, NGA, GEBCO

Earthquake Generator

• WEST VALLEY FAULT

– Has 3 segments (30km, 37km,

29km based on measurement

from map in MMEIRS Report)

– Recurrence interval < 500 years

Model Earthquake

• MODEL 08

– 67 km long segment

– Magnitude 7.2

Image Landsat / CopernicusData SIO, NOAA, U.S. Navy, NGA, GEBCO

Earthquake effects

• Structure damage or collapse

• Geotechnical Issues

(landslides, liquefaction, etc.)

• Fire Hazard

• Evacuation Difficulty

• Damage of communication

lines/utilities

• Damage of roads/access to

various places

What can be done?

• EARTHQUAKE POSSIBILITY

– NONE

• EARTHQUAKE EFFECTS

– Evacuation Plans

– Information Drives

– Drills

– Retrofitting of structures

– Better design of new structures

– Alternative plans

(connection/transport/communication)

Lessons from other

places

• Earthquake data from other

large earthquakes in

populated cities:

–Evacuation plan

–Retrofitting done (if there is)

–Assessment of high risks and

how to minimize

Comprehensive Studies

• Earthquake Impact Reduction

Study for Metropolitan Manila,

Republic of the Philippines

(MMEIRS) by Japan International

Cooperation Agency (JICA),

Metropolitan Manila

Development Authority (MMDA),

Philippine Institute of Volcanology

and Seismology (PHIVOLCS) in

2004.

Earthquake Studies

Research

• Research and studies in relation to

the threats accompanying the

earthquake.

– Mendoza, Tingatinga (2012)

– Rodriguez Jr., Victoria(2015)

– Azul (2017)

Synthetic Earthquake Generation

Concept

References• Japan International Cooperation Agency (JICA); Metropolitan Manila

Development Authority (MMDA); Philippine Institute of Volcanology

and Seismology (PHIVOLCS), 2004. Earthquake Impact Reduction

Study for Metropolitan Manila, Republic of the Philippines (MMEIRS),

s.l.: s.n.

• Mendoza, D. J. & Tingatinga, E. A., 2012. Development of Artificial

Earthquake Records in the Philippines using Specific Barrier Model

Considering Local Site Conditions. Lisbon, World Conference on

Earthquake Engineering.

• Rodriguez, Jr., R. & Victoria, R. A., 2015. Assessment of Ground Motion

Amplification in Taguig and Binondo from an Artificial Ground Motion.

Quezon City

• Azul, K., 2017, A Study on Validity and Applicability of EXSIM_V3 in

the Philippine Setting

• Google, 2015. Google Earth Pro (Version 7.1.5.1557) [Computer

Program]. s.l.:s.n.

THANK YOU!