ESTIMATING EARTHQUAKE

RISKS: A Case Study on Rapid

Earthquake Damage Assessment

System (REDAS) Application In San

Jose City, Nueva Ecija

ANNIE MELINDA PAZ-ALBERTO, Ph.D.

HANNA MAE T. CARGANILLA

LEO CHRISTOPHER C. VIRAY

ROBERTO D. PELAYO

MA. JOHANNA J. DE DIOS

Institute for Climate Change and Environmental Management,

Central Luzon State University

Science City of Muñoz, Nueva Ecija

Introduction The Philippines is the 3rd most vulnerable country to disaster

risks in the world.

Natural disasters are related to our country’s geography hence, it has high exposure to hazards which lead to poverty and environmental degradation.

A tool called (REDAS), which is developed by PHIVOLCS – DOST can provide quick and near real-time simulated earthquake hazard map information with exposure data and risk elements for determining the extent of potential damage caused by seismic hazard

REDAS software can simulate earthquake hazards like ground shaking, liquefaction, earthquake-induced landslide and tsunami

Objectives The main objective of the study was to estimate the earthquake risk using the Rapid Earthquake Damage Assessment System (REDAS) software in San Jose City, Nueva Ecija. Specifically it aimed:

•To establish earthquake hazard exposure databases. •To estimate the total damage floor area caused by the earthquake and calculate the damage/economic loss. •To estimate the collapse and complete building damages and fatalities.

Methodology

Use of Exposure Database Module

Mapping

Computation of Damage and Loss

Plotting of Maps using QGIS

Data Processing

Data Gathering

Ocular Inspection

Methodology

Ocular Inspection • 3 barangays were selected in San Jose City

namely Raymundo Eugenio Poblacion, Canuto Ramos Poblacion and Crisanto Sanchez Poblacion due to high exposure to Philippine Fault

• Verification of barangay boundaries was conducted through the help of the City Assessor’s Office

Data gathering

• Building structure data

• Socio-economic data

Methodology

Data Processing – computation of total damage areas and damage loss using REDAS software

• Encoded

• Verified

• Processed

Plotting of Maps using QGIS

• Risk maps were plotted and data were entered in exposure database to analyze the earthquake risks

Computation of Damage Floor Areas and Damage Loss

• Building structure data were used in the REDAS software to compute for the total damage floor areas and estimated damage loss for the destruction caused by the simulated earthquake intensity

Methodology

Mapping for the total damage floor areas and estimated damage loss using the REDAS software

Computation of Damages, Economic Loss and Fatalities using the paintbrushing tool of REDAS.

• The surveyed data for the 3 pilot barangays were used to compute the Damages, Economic Loss and Fatalities for San Jose City using the paintbrushing tool of REDAS software.

Use of Exposure Database Module – put building data.

Development of exposure database.

Results

REDAS earthquake hazard simulation map based on July 16,1990 earthquake data

San Jose City Profile

Second class city in Province of Nueva Ecija

Northernmost City of the Province

According to the Census of 2012 it has a total population of 129,424 people in 23,191 households

Composed of 38 barangays

Located near the Philippine Fault System

San Jose City, Municipal Hall

Imagery map of San Jose City, Nueva Ecija

Total Damage Floor Area in

3 Pilot Barangays

21,001 – 24,000 sqm

18,001 – 21,000 sqm

15,001 – 18,000 sqm

12,001 – 15,000 sqm

9,000 – 12,000 sqm

Legend

24,001 – 27,000 sqm

0

5000

10000

15000

20000

25000

Raymundo

Eugenio Poblacion

Canuto Ramos

Poblacion

Crisanto Sanchez

Poblacion

24,856

24,116

14,721

Total Damage Floor Area

Total Damage Floor Area in

3 Pilot Barangays

Raymundo Eugenio Poblacion Total

Damage Floor Area

Legend

7,001 – 7,500 sqm

6,501 – 7,000 sqm

6,001 – 6,500 sqm

5,501 – 6,000 sqm

5,001 – 5,500 sqm

4,501 – 5,000 sqm

4,001 – 4,500 sqm

3,501 – 4,000 sqm

3,001 – 3,500 sqm

2,500 – 3,000 sqm

0

1000

2000

3000

4000

5000

6000

7000

8000

3,516

7,279

4,223 3,622

2,990 3,215

Raymundo Eugenio Poblacion

Total Damage Floor Area

(square meter)

Total Damage Floor Area

0

5

10

15

20

25

C1L C1M CWS MWS W1

25

2

18

11

3

Total Structural Type of

REP_BLOCK_2

Total

Sample pictures of

REP_Block_2 buildings

Canuto Ramos Poblacion Total Damage

Floor Area

4,001 – 4,500 sqm

3,501 – 4,000 sqm

3,0001– 3,500 sqm

2,501 – 3,000 sqm

2,0001– 2,500 sqm

1,501 – 2,000 sqm

1,000 – 1,500 sqm

Legend

0

500

1000

1500

2000

2500

3000

3500

4000

4500

3,001

1,193

1,715

2,151

3,290

4,163

2,724

4,394

1,477

Canuto Ramos Poblacion

Total Damage Floor Area

(square meter)

Total Damage Floor Area

0

5

10

15

20

25

30

35

C1L CHB MWS N W1

33

6

16

6 7

Total Building Type of

CRP_BLOCK_8

Total

0

2

4

6

8

10

12

14

16

18

C1L CHB MWS N W1

15

12

18

1

9

Total Building Type of

CRP_BLOCK_6

Total

Sample pictures of

CRP_Block_8 buildings

Crisanto Sanchez Poblacion Total Damage

Floor Area

3,000 – 3,500 sqm

3,501 – 4,000 sqm

4,001 – 4,500 sqm

4,501 – 5,000 sqm

Legend

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

CSP_BLOCK_1 CSP_BLOCK_2 CSP_BLOCK_3 CSP_BLOCK_4

3,190

3,494

3,207

4,827

Crisanto Sanchez Poblacion

Total Damage Floor Area

(square meter)

Total Damage Floor Area

0

10

20

30

40

50

60

C1L CHB CWS MWS

60

8

16 15

Total Building Type of

CSP_BLOCK_4

Total

Sample pictures of

CSP_Block_4 buildings

Damage Loss Map in 3 Pilot Barangays

Legend

₱ 160,000,001 – ₱180,000,000

₱140,000,001 – ₱160,000,000

₱ 120,000,0001– ₱140,000,000

₱100,000,000 – ₱120,000,000

₱ 180,000,001 – ₱200,000,000

Crisanto Sanchez Poblacion

Damage Loss Map

Legend

₱35,000,001 – ₱40,000,000

₱25,000,0001– ₱30,000,000

₱20,000,000 – ₱25,000,000

₱30,000,001 – ₱35,000,000

Canuto Ramos Poblacion

Damage Loss Map

Legend

₱25,000,001 – ₱30,000,000

₱20,000,001 – ₱25,000,000

₱15,000,001 – ₱20,000,000

₱10,000,001 – ₱15,000,000

₱5,000,000 – ₱10,000,000

₱35,000,001 – ₱40,000,000

Raymundo Eugenio Poblacion

Damage Loss Map

Legend

₱20,000,001 – ₱25,000,000

₱15,000,001 – ₱20,000,000

₱10,000,001 – ₱15,000,000

₱5,000,000 – ₱10,000,000

₱30,000,001 – ₱35,000,000

0.00

20,000,000.00

40,000,000.00

60,000,000.00

80,000,000.00

100,000,000.00

120,000,000.00

140,000,000.00

160,000,000.00

180,000,000.00

200,000,000.00

Raymundo Eugenio

Poblacion

Canuto Ramos

Poblacion

Crisanto Sanchez

Poblacion

176,459,220.32 181,827,466.23

115,343,065.54

San Jose City Pilot Sites

Total Damage Loss(Php)

Number of Storey per Structural Type

(Canuto Ramos Poblacion)

Structural

Type

Number of Storeys Total

1 2 3 4

C1L 119 58 177

C1M 1 1 2

CHB 40 1 41

CWS 52 25 77

MWS 51 41 92

N 10 1 11

S1L 1 1

W1 9 14 23

W3 1 1

Total 283 140 1 1 425

Number of Storey per Structural Type

(Crisanto Sanchez Poblacion)

Structural

Type

Number of Storeys Total

1 2 3

C1L 99 33 132

C1M 1 1

CHB 17 2 19

CWS 11 21 32

MWS 20 19 39

N 1 1 2

S3L 1 1

W1 5 6 11

Total 154 82 1 237

Number of Storey per Structural Type

(Raymundo Eugenio Poblacion)

Structural

Type

Number of Storeys Total

1 2 3

C1L 45 43 88

C1M 5 5

CHB 42 4 46

CWS 29 6 35

MWS 53 30 83

N 13 13

URM 1 1

W1 9 3 12

W3 1 1

Total 193 86 5 284

Number of Buildings/Structures per

Barangay

Era of Construction per Structural Type

(Canuto Ramos Poblacion)

Structural

Type

Era of Construction Total

1972-1992 Post-1992 Pre-1972

C1L 87 60 30 177

C1M 1 1 2

CHB 16 18 7 41

CWS 40 20 17 77

MWS 38 22 32 92

N 4 3 4 11

S1L 1 1

W1 12 1 10 23

W3 1 1

Total 199 125 101 425

Era of Construction per Structural Type

(Crisanto Sanchez Poblacion)

Structural

Type

Era of Construction Total

1972-1992 Post-1992 Pre-1972

C1L 51 62 19 132

C1M 1 1

CHB 8 5 6 19

CWS 9 7 16 32

MWS 9 8 22 39

N 1 1 2

S1L 1 1

W1 3 3 5 11

Total 80 88 69 237

Era of Construction per Structural Type

(Raymundo Eugenio Poblacion)

Structural

Type

Era of Construction Total

1972-1992 Post-1992 Pre-1972

C1L 38 45 5 88

C1M 3 2 5

CHB 24 19 3 46

CWS 17 7 11 35

MWS 36 11 36 83

N 5 3 5 13

URM 1 1

W1 4 2 6 12

W3 1 1

Total 127 90 67 284

Brgy. Raymundo Eugenio Poblacion

Building/Land Use

2%

19%

4%

0%

2%

0%

2% 71%

Agricultural

Commercial

Government

Hospital

Industrial

Office

Other

Residential

Brgy. Canuto Ramos Poblacion

Building/Land Use

0% 9% 1% 0%

1% 1%

5%

83%

Agricultural

Commercial

Government

Hospital

Industrial

Office

Other

Residential

Brgy. Crisanto Sanchez Poblacion

Building/Land Use

1% 4%

1% 2% 1%

4%

87%

0%

Agricultural

Commercial

Government

Industrial

Office

Other

Residential

Unknown

Building Condition of the Buildings in

Raymundo Eugenio Poblacion

Building Condition of the Buildings in

Crisanto Sanchez Poblacion

Building Condition of the Buildings in

Canuto Ramos Poblacion

Brgy. Raymundo Eugenio Poblacion

Building Types

4% 1%

1%

17%

5%

4% 55%

4% 9%

0%

Apartment House

Boarding House

Bodega

Commercial

Multiple Dwelling

Office Building

One Family Dwelling

Other

Two Family Dwelling

Warehouse

Brgy. Canuto Ramos Poblacion

Building Types

4% 1%

7%

1%

3% 2%

68%

7% 7% Apartment House

Bodega

Commercial

Lodging House

Multiple Dwelling

Office Building

One Family Dwelling

Other

Two Family Dwelling

Brgy. Crisanto Sanchez Poblacion

Building Types

3% 3% 4% 1%

6% 1%

75%

3%

1%

3%

0%

Apartment House

Bodega

Commercial

Lodging House

Multiple Dwelling

Office Building

One Family Dwelling

Other

Recreation Building

Two Family Dwelling

Warehouse

Complete building damages for San Jose City,

Nueva Ecija.

0-30,000 sqm

90,001-120,000 sqm

60,001-90,000 sqm

30,001-60,000 sqm

120,001-150,000 sqm

210,001-240,000 sqm

240,001-270,000 sqm

270,001-300,000 sqm

150,001-180,000 sqm

180,001-210,000 sqm

Barangay Name Complete Damages (m²)

Rafael Rueda Sr. Pob. (District I) 225,681.07

Abar Ist 132,929.82

Calaocan 65,011.24

Malasin 48,844.01

Sibut 45,603.97

Santo Niño 1st 38,302.18

Santo Tomas 34,910.80

Palestina 34,699.70

Kita-Kita 29,517.36

Santo Niño 2nd 27,687.07

Santo Niño 3rd 27,495.52

Caanawan 20,614.37

Raymundo Eugenio Pob. (District IV) 19,363.30

Ferdinand E. Marcos Pob. (District II) 19,140.63

Canuto Ramos Pob. (District III) 18,471.90

Tondod 16,945.88

Pinili 12,466.08

Crisanto Sanchez Pob. (District V) 11,781.28

Kaliwanagan 11,379.95

Tabulac 10,167.51

Villa Marina 9,945.73

San Agustin 9,870.58

Porais 9,542.20

Bagong Sikat 8,489.77

Culaylay 8,435.96

Tayabo 8,313.51

Sinipit Bubon 8,182.86

Villa Joson (Parilla) 7,245.33

Dizol 7,167.78

Tulat 7,008.93

Abar 2nd 6,413.39

San Juan 6,099.37

Parang Mangga 5,427.41

Camanacsacan 5,148.93

Manicla 4,904.73

A. Pascual 4,321.66

San Mauricio 3,951.95

Villa Floresca 2,372.03

Total 973,855.73

Collapsed building damages for San Jose City,

Nueva Ecija.

0-4,000 sqm

12,001-16,000 sqm

8,001-12,000 sqm

4,001-8,000 sqm

16,001-20,000 sqm

28,001-32,000 sqm

32,001-36,000 sqm

36,001-40,000 sqm

20,001-24,000 sqm

24,001-28,000 sqm

Barangay Name Collapsed Damages (m²)

Rafael Rueda Sr. Pob. (District I) 28,078.62

Abar Ist 16,538.64

Calaocan 8,089.34

Malasin 6,073.02

Sibut 5,677.29

Santo Niño 1st 4,762.22

Santo Tomas 4,340.57

Palestina 4,319.81

Kita-Kita 3,670.06

Santo Niño 2nd 3,442.49

Santo Niño 3rd 3,416.20

Caanawan 2,563.13

Ferdinand E. Marcos Pob. (District II) 2,381.46

Raymundo Eugenio Pob. (District IV) 2,347.32

Canuto Ramos Pob. (District III) 2,255.12

Tondod 2,106.91

Pinili 1,550.97

Crisanto Sanchez Pob. (District V) 1,511.52

Kaliwanagan 1,411.55

Tabulac 1,265.09

Villa Marina 1,234.74

San Agustin 1,228.77

Porais 1,187.15

Bagong Sikat 1,056.21

Culaylay 1,048.88

Tayabo 1,031.20

Sinipit Bubon 1,017.43

Villa Joson (Parilla) 900.15

Dizol 891.81

Tulat 872.03

Abar 2nd 797.44

San Juan 757.86

Parang Mangga 675.32

Camanacsacan 640.64

Manicla 607.80

A. Pascual 537.31

San Mauricio 491.44

Villa Floresca 294.20

Total 121,071.69

Economic Loss for San Jose City, Nueva Ecija.

₱0- ₱400,000,000

₱400,000,0001- ₱800,000,000

₱800,000,001- ₱1,200,000,000

₱1,200,000,001- ₱1,600,000,000

₱1,600,000,001- ₱2,000,000,000

₱2,000,000,001- ₱2,400,000,000

₱2,400,000,001- ₱2,800,000,000

₱2,800,000,001- ₱3,200,000,000

₱3,200,000,001- ₱3,600,000,000

₱3,600,000,001- ₱4,000,000,000

Barangay Name Economic Loss (Pesos)

Rafael Rueda Sr. Pob. (District I) 3,051,000,000

Abar Ist 1,797,000,000

Calaocan 879,000,000

Malasin 676,000,000

Sibut 603,000,000

Santo Niño 1st 530,000,000

Santo Tomas 483,000,000

Palestina 459,000,000

Kita-Kita 408,000,000

Santo Niño 3rd 390,000,000

Santo Niño 2nd 383,000,000

Caanawan 285,000,000

Raymundo Eugenio Pob. (District IV) 261,000,000

Ferdinand E. Marcos Pob. (District II) 259,000,000

Canuto Ramos Pob. (District III) 244,000,000

Tondod 235,000,000

Pinili 169,000,000

Kaliwanagan 169,000,000

Crisanto Sanchez Pob. (District V) 162,000,000

Villa Marina 144,000,000

Tabulac 137,000,000

San Agustin 130,000,000

Porais 129,000,000

Tayabo 124,000,000

Culaylay 117,000,000

Bagong Sikat 115,000,000

Sinipit Bubon 113,000,000

Villa Joson (Parilla) 103,000,000

Dizol 97,000,000

Tulat 95,000,000

Abar 2nd 89,000,000

San Juan 86,000,000

Manicla 75,000,000

Parang Mangga 73,000,000

Camanacsacan 70,000,000

A. Pascual 60,000,000

San Mauricio 55,000,000

Villa Floresca 35,000,000

Total 13,290,000,000

Fatalities for San Jose City, Nueva Ecija.

0-15

16-30

31-45

46-60

61-75

76-90

91-105

106-120

121-135

136-160

Barangay Name Fatalities

Abar Ist 115

Malasin 40

Sibut 40

Santo Niño 3rd 40

Calaocan 39

Santo Niño 1st 38

Santo Tomas 34

Santo Niño 2nd 34

Palestina 32

Kita-Kita 27

Caanawan 24

Tayabo 20

San Agustin 19

Porais 19

Tondod 18

Pinili 16

Abar 2nd 16

Canuto Ramos Pob. (District III) 14

Kaliwanagan 12

Ferdinand E. Marcos Pob. (District II) 11

Bagong Sikat 11

Rafael Rueda Sr. Pob. (District I) 10

Culaylay 10

Villa Joson (Parilla) 9

San Juan 9

Manicla 9

Crisanto Sanchez Pob. (District V) 8

Tulat 8

Camanacsacan 8

A. Pascual 8

Raymundo Eugenio Pob. (District IV) 7

Villa Marina 7

Tabulac 7

Sinipit Bubon 6

Parang Mangga 6

San Mauricio 6

Dizol 5

Villa Floresca 3

Total 745

Sample pictures of Barangay Rafael Rueda buildings in

San Jose City, Nueva Ecija

Sample pictures of Barangay Abar 1st buildings

in San Jose City, Nueva Ecija

Acknowledgement is due to the

following: PCIEERD,DOST- for funding support

CHED- for funding support

LGUs of San Jose City, Nueva Ecija- for

giving secondary data

Local people- as respondents to gather

the primary data

Thank you very

much!