Database Development for
Earthquake Risk Assessment
Muhammad Murad Billah
CONTENTS
•
Base Map Development
•
Hazard Mapping
- Active Fault Study
- Engineering Geological Mapping - Seismic Hazard Mapping
•
Vulnerability Mapping
- Building
- Lifeline (transportation & utility system) - Essential Facilities
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
BASE MAP
Geological Map
• Source: GSB
BASE MAP
Quickbird Images
• Resolution: 62cm • Acquisition date: 2006-2008 • Georeferencing: RTK GPS & DGPSCollection 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
BASE MAP
Topographic Maps
• Source: SoB (Dhaka & Sylhet), BIWTA&CDA (Chittagong)
• Scan & georeference
• Spot-height digitization
• Digital Elevation Model (DEM) generation
BASE MAP
Ward Maps
• Cluster generation
• Source: DCC, CDA, SCC
• Scan, georeference, digitize
• Field verification & revision
BASE MAP
Physical Feature
• Components: building, road, waterbody, open space, hill
• Source: RAJUK, CDA, ADPC Base Map
• Digitize, field survey
HAZARD MAPPING
•
Active Fault Study
•
Engineering Geological Mapping
ACTIVE FAULT STUDY
•
Madhupur Fault
•
Dauki Fault
•
Plate Boundary Fault - 1
•
Plate Boundary Fault - 2
•
Plate Boundary Fault - 3
Active Fault Location
ACTIVE FAULT STUDY
• Corona Image Study, Historical Earthquake
• Field Survey: Moynamoti, Dauki, Hobigonj, Tangail, Shitakunda,
Madhabkunda, Teknaf &Haluaghat
• Trenching: Gabrakhari, Haluaghat; and Dharmapur, Feni
ACTIVE FAULT STUDY
•
Gabrakhari, Haluaghat
Trenching activities
ACTIVE FAULT STUDY
•
Dharmapur, Feni
Trenching activities
ENGINEERING GEOLOGY
•
Boring
•
Borehole database
D7 - Mehernagar, Dhobadia (Kaskura),
Dhaka
ENGINEERING GEOLOGY
• PS Logging
ENGINEERING GEOLOGY
•
Array Microtremor
Field activities & database development
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
Usable data
Usable data (soil tests)
General features of existing soil, such as density
but not non-linear characteristics
Usable data
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
Usable data
SEISMIC HAZARD MAP
•
Soil Classification
•
Liquefaction Susceptibility
•
Slope Hazard Susceptibility
VULNERABILITY MAPPING
•
Building
- General Building Stock
•
Lifeline
- Transportation System
- Utility System
VULNERABILITY MAPPING
•
Building
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
Micro Tremor
Instruments Used for Building Vulnerability
Assessment
Vibration Shaker
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).
LIFELINE
Highway Transportation System
• Components: Road, Bridge
• Assessment: accessibility, structural characteristics
LIFELINE
Railway Transportation System
• Components: Track, Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility
• Assessment: accessibility, building structure, service performance
LIFELINE
Bus Transportation System
• Components: Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility
• Assessment: building structure, service performance
LIFELINE
• Components: Passenger
Terminal, Dispatch Facility, Fuel Facility, Maintenance Facility
• Assessment: building structure, service performance
LIFELINE
Potable Water System
• Components: Pipeline,
production & distribution facility
• Assessment: pipe ductility, facility service performance
LIFELINE
Waste Water System
• Components: Pipeline, collection & distribution facility
• Assessment: pipe ductility, facility service performance
LIFELINE
Natural Gas System
• Components: Pipeline, distribution facility
• Assessment: pipe ductility, facility service performance
LIFELINE
Electric Power System
• Components: Distribution facility
• Assessment: seismic design, facility service performance
LIFELINE
Communication System
• Components: Distribution & transmission station
• Assessment: structural
characteristics, facility service performance
ESSENTIAL FACILITY
• Components: - Hospital & Clinic - Police & Fire Station
- Emergency Operation Center - School & University
• Assessment: building structure, service performance
