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Database Development for Earthquake Risk Assessment. Muhammad Murad Billah Senior GIS Coordinator

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(1)

Database Development for

Earthquake Risk Assessment

Muhammad Murad Billah

(2)

CONTENTS

Base Map Development

Hazard Mapping

- Active Fault Study

- Engineering Geological Mapping - Seismic Hazard Mapping

Vulnerability Mapping

- Building

- Lifeline (transportation & utility system) - Essential Facilities

(3)

GIS DATABASE DEVELOPMENT

What is GIS?

A geographic information system (GIS) integrates hardware,

software, and data for capturing, managing, analyzing, and

displaying all forms of geographically referenced information.

Database View

Map View

(4)

BASE MAP

Geological Map

• Source: GSB

(5)

BASE MAP

Quickbird Images

• Resolution: 62cm • Acquisition date: 2006-2008 • Georeferencing: RTK GPS & DGPS

(6)

Collection of Quick Bird Image

On Screen Digitization (building, road, water body, open space, hill) Geo-referencing the Quickbird Image

by RTK GPS with the surveyed GCPs

Base line survey with total station Selection of TIC/GCP on the Image and Establishment of Bench Mark

Development of GIS database as a base map by incorporating attribute data & field information

Field verification and Attribute information collection

(7)

BASE MAP

Topographic Maps

• Source: SoB (Dhaka & Sylhet), BIWTA&CDA (Chittagong)

• Scan & georeference

• Spot-height digitization

• Digital Elevation Model (DEM) generation

(8)

BASE MAP

Ward Maps

• Cluster generation

• Source: DCC, CDA, SCC

• Scan, georeference, digitize

• Field verification & revision

(9)

BASE MAP

Physical Feature

• Components: building, road, waterbody, open space, hill

• Source: RAJUK, CDA, ADPC Base Map

• Digitize, field survey

(10)

HAZARD MAPPING

Active Fault Study

Engineering Geological Mapping

(11)

ACTIVE FAULT STUDY

Madhupur Fault

Dauki Fault

Plate Boundary Fault - 1

Plate Boundary Fault - 2

Plate Boundary Fault - 3

Active Fault Location

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ACTIVE FAULT STUDY

• Corona Image Study, Historical Earthquake

• Field Survey: Moynamoti, Dauki, Hobigonj, Tangail, Shitakunda,

Madhabkunda, Teknaf &Haluaghat

• Trenching: Gabrakhari, Haluaghat; and Dharmapur, Feni

(13)

ACTIVE FAULT STUDY

Gabrakhari, Haluaghat

Trenching activities

(14)

ACTIVE FAULT STUDY

Dharmapur, Feni

Trenching activities

(15)

ENGINEERING GEOLOGY

Boring

Borehole database

(16)

D7 - Mehernagar, Dhobadia (Kaskura),

Dhaka

ENGINEERING GEOLOGY

• PS Logging

(17)

ENGINEERING GEOLOGY

Array Microtremor

Field activities & database development

(18)

Usable data (quantities)

Dhaka Chittagong Sylhet

Area (sqkm) 321 233 160 714 sqkm 420 Grids (250m) 5,150 3,750 2,600 11,500 grids 6720

Geology map generated

Geomorphic Map generated

Boring 38 38 38 114 holes 80 by ADPC(DU)/GSB 1,166 1,145 1,066 3,376 m 4400 max 100m SPT 777 751 710 2,238 depths 2000 by ADPC(DU)/GSB 2m pitch PS logging 7 6 6 19 holes 16 by ADPC(AIT) 190 172 164 526 m 640m max 50m Shallow Seismic Survey 50 41 34 125 pts 2 Array Microtremor 10 6 6 22 pts 2 Single H/V microtremor 97 86 74 257 pts 50

less than 30m depth by GSB

less than 30m depth

1.5m pitch reference of Gandhidham city Total item by GSB

(19)

Usable data

(20)

Usable data (soil tests)

General features of existing soil, such as density

but not non-linear characteristics

(21)

Usable data

(22)

Usable data

(array microtremor)

depth Dhaka Chittagong Sylhet Vs>300m/s 15 - 46m 9 - 38m < 35m Vs>500m/s 73 - 178m 19 - 148m 35 - 103m

(23)

Usable data

(24)
(25)

SEISMIC HAZARD MAP

Soil Classification

Liquefaction Susceptibility

Slope Hazard Susceptibility

(26)
(27)
(28)
(29)

VULNERABILITY MAPPING

Building

- General Building Stock

Lifeline

- Transportation System

- Utility System

(30)

VULNERABILITY MAPPING

Building

(31)

Building Vulnerability Assessment in Dhaka, Chittagong

and Sylhet

In Dhaka about 8500 buildings

In Chittagong 6000 buildings and

In Sylhet 4500 buildings

Under CDMP Project following number of buildings have

been surveyed

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(33)

Micro Tremor

Instruments Used for Building Vulnerability

Assessment

(34)

Vibration Shaker

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Technology Transfer

Depart of Civil Engineering of Shajalal University of

Science and Technology (SUST) and Chittagong University of

Engineering and Technology (CUET) has acquired the capacity

to do similar assessment.

35 Engineers was trained under this project to use

different instruments for building vulnerability assessment.

110 Engineering students got on the job training (in

surveying building type, occupancy and other aspects).

(42)

LIFELINE

Highway Transportation System

• Components: Road, Bridge

• Assessment: accessibility, structural characteristics

(43)

LIFELINE

Railway Transportation System

• Components: Track, Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility

• Assessment: accessibility, building structure, service performance

(44)

LIFELINE

Bus Transportation System

• Components: Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility

• Assessment: building structure, service performance

(45)

LIFELINE

• Components: Passenger

Terminal, Dispatch Facility, Fuel Facility, Maintenance Facility

• Assessment: building structure, service performance

(46)

LIFELINE

Potable Water System

• Components: Pipeline,

production & distribution facility

• Assessment: pipe ductility, facility service performance

(47)

LIFELINE

Waste Water System

• Components: Pipeline, collection & distribution facility

• Assessment: pipe ductility, facility service performance

(48)

LIFELINE

Natural Gas System

• Components: Pipeline, distribution facility

• Assessment: pipe ductility, facility service performance

(49)

LIFELINE

Electric Power System

• Components: Distribution facility

• Assessment: seismic design, facility service performance

(50)

LIFELINE

Communication System

• Components: Distribution & transmission station

• Assessment: structural

characteristics, facility service performance

(51)

ESSENTIAL FACILITY

• Components: - Hospital & Clinic - Police & Fire Station

- Emergency Operation Center - School & University

• Assessment: building structure, service performance

(52)

Thank You for Your Patience!

For further information write to:

References

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