ROBERT S. ABLOG MAP OF THE PROVINCE OF ILOCOS SURicfec.weebly.com/uploads/9/4/4/2/94425229/earthquake...Ilocos Sur Polytechnic State College 1 st International Conference on Food,

ROBERT S. ABLOGFaculty

Ilocos Sur Polytechnic State College

1st International Conference on Food, Environment and CultureHotel Supreme, Magsaysay Ave. Baguio City, PhilippinesMay 15-18, 2017

MAP OF THE PROVINCE OF ILOCOS SUR


RATIONALEThe Islands of Philippines straddles the

western fringes of the Pacific Ring of Fire.

According to National Geographic Society, the Ring of Fire is a string of volcanoes and sites of seismic activity, or earthquakes. Roughly , 90% of all earthquakes occurred and 75% of all active volcanoes on Earth were dotted.

the country has experienced more than 106 earthquakes with a magnitude of 6.0 or higher since 1600.


Ilocos Sur is located along the western coast of Northern Luzon

Bordered by Ilocos Norte to the north; Abra, Mountain Province, and Benguet to the east; La Union to the south, and the China Sea to the west

32 municipalities and 2 cities

18 of which are located in coast line of China sea

Total population of 658,587 in 2010

RATIONALE


According to Quakebulletin.com, a total of 152 earthquakes was recorded that occurred in Ilocos Sur, Philippines and vicinity since 1900.

Of this number, the deadliest earthquakes took place in the last 50 years includes the July 16, 1990.• Particularly Baguio City and

Cabanatuan City • 7.9-magnitude earthquake. • At least 1,200 people died from the

quake.

RATIONALE


The probability of these destructive earthquakes occurring again in the future is indeed very strong that could bring tragedy to the natural and man-made environment and can cause extensive economic losses and social disturbances.

Rapid Earthquake Damage Assessment System (REDAS) offers a rapid estimate of the possible seismic hazards and the severity of the impacts to population, buildings, lifelines, road networks and other elements-at- risks.

This study aimed to estimate earthquake risk using the Rapid Earthquake Damage Assessment System (REDAS) in Ilocos Sur, Philippines.

RATIONALE


METHODOLOGY

Capacity Building• Training-workshop on the use of the Rapid Earthquake

Damage Assessment System (REDAS) Software and Android EDM to ensure proper manipulation of software and reliability of impact assessment data produced.

• Spearheaded by the project staff from Isabela State University and Philippine Institute of Volcanology and Seismology (Phivolcs).


METHODOLOGY

Site selection and validation

Surveyed Barangay ClassificationsCabaroan, Sta. Maria ResidentialSan Pedro, Candon ResidentialSan Antonio, Candon MixedSan Juan, Candon MixedBarangay 1, Vigan City Commercial


METHODOLOGY

Data Collection• Ten (10) commissioned enumerators were trained

and deployed to facilitate the building survey.

• Coordination in the city local government unit as well as in the barangay offices was carried out before the conduct of enumeration.

• Android phones equipped with android EDM application were used to gather information.

• Total enumeration was employed in all pilot barangay.


METHODOLOGY

Exposure Database Development• Exposure, sometimes referred to as the elements at risk• Area-based approach was adopted in Exposure database

development.• The database composed of building information such as

coordinates, floor area, number floors, building class, era of construction and number of occupants.

• Developed database was integrated in the REDAS software as seat of the information in estimating impacts due to earthquakes.


METHODOLOGY

Risk Calculation and Loss Estimation• The equations to calculate risk and estimate loss due to

earthquakes are set or imbedded in the REDAS software.

• The Ground Shacking tool under Seismic Hazard Assessment Menu was set to estimate the impact of a 7.2 magnitude earthquake.

• The Parameters used were: Longitude of Epicenter is 1200 08’24” and Latitude of Epicenter is 17021’07.92”, the depth of earthquake is 10 km with bidirectional movement. The Peak Ground Acceleration (Hard Soil) and Richer method for intensity conversion were used to estimate the impact.


Findings:

Characteristics of Pilot Barangay• Number of Surveyed Households

1447 building structures surveyed in five pilot barangay in the province of Ilocos Sur

Figure 1. Distribution and number of surveyed households


Findings: Characteristics of Pilot Barangay

• Structural type

0

20

40

60

80

100

120

Barangay I (Pob.) Cabaroan San Pedro San Antonio(Pob.)

San Juan (Pob.)

25.61

3.64

5.49

28.12

8.93 4.7114.91

32.11

10.88

20.54 23.04

24

1.42

23.34

5.36 5.24

21.09

1.83 13.26

9.822.09

4.36

31.71 22.81

52.6864.4

25.45

1.06 2.68 0.52 1.09

URAL (Stone Bearing Walls)

NL (Makeshift/Squatters)

C1L (Concrete Two Storey)

W1L (Wood light)

URML (Churches)

S1L (Steel Frame Wall)

MWSL (CHB with Wood)

CWSL (Ancestral House)

CHBL (CHB Bungalow)

C1M (Concrete Multi-Storey)


Findings: Characteristics of Pilot Barangay

• Era of Construction

0

20

40

60

80

100

Barangay I(Pob.)

Cabaroan San Pedro SanAntonio(Pob.)

San Juan(Pob.)

Total

303 12

18 16

16

33 929

13

22

54 6479

5387

62

Post 1992

1972-1992

Pre 1972


Findings: Exposure Database Development

• Floor Area Percentage

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Residential Mix Commercial

10%2%

24%

15%

31%

10%

3%

1%1%

14%

28%

37%

21%

35%

24%

5%

35%

2% 1%





URML (Churches)


CHBL (CHB Bungalow)



W1L (Wood light)



• Population Distribution

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%


6% 2% 0%1%

0% 0%

13%

7%0%

41%

15%

2%

14%

20%

13%

26%

41%

58%

0%9%

23%

0% 1% 4% S1L (Steel Frame Wall)




URML (Churches)


CHBL (CHB Bungalow)



W1L (Wood light)



• Structural Type Ratio

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%


10%2% 0%

24%

15%

1%

31%

10%

3%

0%

1%

0%

0%

1%

0%

14%

28%

37%

21%

35%

24%

5%

35%

2% 1%





URML (Churches)


CHBL (CHB Bungalow)



W1L (Wood light)


Findings:

Estimated Impact of M7.2 Earthquake

Rapid Earthquake Damage Assessment System (REDAS) program can provide rapid estimate of the possible seismic hazards and the severity of the impacts to population, buildings, lifelines, road networks and other elements-at- risks.

The province could suffer 134,615 building and 8,017,663.8 m2 floor damages with 20,959 casualties and economic loss of more than 39 billion pesos

The possible impact in terms of building damages, casualties and economic losses must be disseminated in local government

Conclusion:

Isabela state UniversityOrlando Balderama, Lanie Alejandro-Alejo, Juanito Rosini, Joel Alcaraz, Cesar Vallejo, Elmer Rosete, Marie Rose Mata, Jasmine Passion, Marvin Borromeo

Philippine Institute of Volcanology and Seismology (Phivolcs)

The REDAS Team Program Leader: Maria Leonila P. Bautista Project Leaders: Bartolome C. Bautista (Software Development),

Ishmael C. Narag (Tsunami Modeling), Arturo S. Daag (Landslide Hazard Modeling), Ma. Lynn P. Melosantos (Liquefaction Hazard Modeling) and Angelito G. Lanuza (Ground Shaking Modeling)

ACKNOWLEDGEMENT

MAP OF PROVINCE OF ILOCOS SUR

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Documents

ROBERT S. ABLOG MAP OF THE PROVINCE OF ILOCOS SURicfec.weebly.com/uploads/9/4/4/2/94425229/earthquake...Ilocos Sur Polytechnic State College 1 st International Conference on Food,