Development of earthquake assessment methodology in ncree
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Development of Earthquake Assessment Methodology In NCREE. Chin-Hsun Yeh, Chin-Hsiung Loh and Keh-Chyuan Tsai. Outline of Presentation. Background of HAZ-Taiwan / TELES Early Seismic Loss Estimation (ESLE) Ground motion intensity Soil liquefaction potential Damage assessment of GBS

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Development of Earthquake Assessment Methodology In NCREE

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Development of earthquake assessment methodology in ncree

Development of EarthquakeAssessment Methodology In NCREE

Chin-Hsun Yeh, Chin-Hsiung Loh and Keh-Chyuan Tsai


Outline of presentation

Outline of Presentation

  • Background of HAZ-Taiwan / TELES

  • Early Seismic Loss Estimation (ESLE)

    • Ground motion intensity

    • Soil liquefaction potential

    • Damage assessment of GBS

    • Casualty assessment

  • Concluding remarks

    • Potential applications

Development of Earthquake Assessment Methodology in NCREE, Yeh


Lessons from historical earthquakes

Lessons from Historical Earthquakes

  • Northridge (1994), Kobe (1995) earthquakes

  • Important issues in seismic disaster mitigation and catastrophic risk management

    • Seismic hazard analysis (deterministic or probabilistic)

    • Damage assessment of civil infra-structures

    • Socio-economic loss estimation

  • We need both a framework of methodology and an application software to integrate and to apply the state-of-the-art technologies

Development of Earthquake Assessment Methodology in NCREE, Yeh


Background of haz taiwan

Background of HAZ-Taiwan

  • Proposed in 1997, started in 1998 by NSC

  • Develop an integrated GIS-based earthquake loss estimation system to be used in proposing seismic disaster mitigation strategies

  • Although at that time, only few inventory database and analysis models appropriate in Taiwan, the NSC spent a lot of money

    • Promote disaster mitigation researches

    • Solve practical problems

Development of Earthquake Assessment Methodology in NCREE, Yeh


Methodology framework of haz twn

Methodology Framework of HAZ-TWN

Potential Earth Science Hazards

Ground Motion

Ground Failure

Direct Physical Damages

General BuildingStocks

EssentialFacilities

TransportationSystems

UtilitySystems

Indirect Physical Damages

Socio-economic Losses

Fire Following

Debris

Casualties

Shelters

Economic Losses

Indirect Losses

Development of Earthquake Assessment Methodology in NCREE, Yeh


Haz twn a decision making support tool

HAZ-TWN - a Decision-making Support Tool

Natural Hazards Identification

Data Collection and Modeling

Comprehensive Hazard Analysis & Risk Assessment

Mitigation Strategies

Awareness and Preparedness

Response and Recovery

Performance Measures

Planning and Exercise Scenarios

Quick Situation Assessment

Building Code Administration

Ground Truthing

Future Land Use Planning

Development of Earthquake Assessment Methodology in NCREE, Yeh


Early seismic loss estimation esle

Early Seismic Loss Estimation (ESLE)

  • TREIRS of CWB obtains earthquake magnitude, epicenter coordinates and focal depth within 90 seconds and sends e-mail to all clients

  • ESLE auto-trig by email and complete quick assessment (ground motion intensity, building damages and casualties) in less than 15 minutes

  • Important results automatically output in maps and tables to save time and man work

  • Run multiple instances at the same time and have user-friendly interface to compare and interpret simulation results

Development of Earthquake Assessment Methodology in NCREE, Yeh


Application of esle in emergency responses

Application of ESLE in Emergency Responses

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Prediction of Ground Motion Intensity

Development of Earthquake Assessment Methodology in NCREE, Yeh


A deterministic approach

Chun-li

A Deterministic Approach

Site-Specific PGA, PGV andResponse Spectrum

Amplification

Epicenter Location, Focal Depth,Magnitude, Fault Trace, Rupture Length, Width and Dip Angle

Local Site Conditions

Wave Propagation─Intensity Attenuation and Frequency Filtering

Development of Earthquake Assessment Methodology in NCREE, Yeh


Chi chi earthquake as an example

Chi-Chi Earthquake as an Example

Development of Earthquake Assessment Methodology in NCREE, Yeh


Different sets of source parameters

Different Sets of Source Parameters

ShuangTung Fault

Chelongpu Fault

Arbitrary Rupture Plane

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Seismic Event and Source Parameters

Title of theMap

Legend

Intensities of Nantou, Taichung, Changhwa and Yuenlin are greater than six

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Point source

Shuang-Tung Fault

Arbitrary Fault

Chelongpu Fault

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Estimation of Soil Liquefaction Potential

Development of Earthquake Assessment Methodology in NCREE, Yeh


Borehole lsc geologic map of taipei

Very high

Rock

High

Sediment, not sensitive

Moderate

Low

Sediment, sensitive

Very low

Water

None

Borehole LSC & Geologic Map of Taipei

Central Geological Survey Bureau, Taiwan

Development of Earthquake Assessment Methodology in NCREE, Yeh


Buffer regions lsc map of taipei

Very high

High

Very high

Moderate

High

Low

Moderate

Very low

Low

None

Very low

Undet. 1

None

Undet. 2

Undet. 1

Buffer Regions & LSC Map of Taipei

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Damage Assessment of General Building Stocks

Development of Earthquake Assessment Methodology in NCREE, Yeh


Analyses of building tax data

Analyses of Building Tax Data

  • Collect building tax data from 22 counties and cities in Taiwan

  • Calculate statistics of total floor areas

    • 15 MBT by material and height

    • 4 seismic design levels by construction year and location

    • 13 SOC by usage

  • Calculate mapping scheme of SOC to MBT for each town

Development of Earthquake Assessment Methodology in NCREE, Yeh


Flowchart of building damage assessment

Flowchart of Building Damage Assessment

PESH Spectral Response

Reduced for Damping/

Duration Effects

Model building Type:

Capacity Curve

Fragility Curve

Drift-Sensitive Non-structural

Accel.-Sensitive Non-structural

Structural

P[DS  ds|SD or SA]

P[DS = ds|SD or SA]

N

S

M

E

C

N

S

M

E

C

N

S

M

E

C

Damage States: N-None, S-Slight, M-Moderate, E-Extensive, C-Complete

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

1-3-story: 37,000

> 8-story: 180

4-7-story: 3,100

Total: 40,000

Development of Earthquake Assessment Methodology in NCREE, Yeh


Building damage statistics in counties

Building Damage Statistics in Counties

Development of Earthquake Assessment Methodology in NCREE, Yeh


Building damage statistics in towns

Building Damage Statistics in Towns

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

Casualty Assessment

Development of Earthquake Assessment Methodology in NCREE, Yeh


Input of casualty assessment

Statistics of dynamic population distributions

Casualty rates in various MBT and damage states

Input of Casualty Assessment

Day time

Night time

Commute time

Development of Earthquake Assessment Methodology in NCREE, Yeh


Flowchart of casualty assessment

BuildingInventory

VulnerabilityAnalysis

CasualtyRates

Demographics

Slight Damage

Occupants Killed

W1L

Moderate Damage

Occupants Killed

Extensive Damage

Occupants Killed

Residential

w/o Collapse

Occupants Killed

Complete Damage

Collapse

Occupants Killed

S1L

S1M

S1H

Casualty rate of wood buildings

Commercial

Industrial

Government

Education

Flowchart of Casualty Assessment

Development of Earthquake Assessment Methodology in NCREE, Yeh


Development of earthquake assessment methodology in ncree

3,500 death or injuries

Development of Earthquake Assessment Methodology in NCREE, Yeh


Casualty statistics in counties

Casualty Statistics in Counties

Development of Earthquake Assessment Methodology in NCREE, Yeh


Casualty statistics in towns

Casualty Statistics in Towns

Development of Earthquake Assessment Methodology in NCREE, Yeh


Comparison of estimate and report of death tolls 6 hour later

Comparison of Estimate and Report of Death Tolls (6 hour later)

Development of Earthquake Assessment Methodology in NCREE, Yeh


Conclusions

Conclusions

  • HAZ-Taiwan / TELES can be applied in

    • Emergency responses

    • Seismic disaster mitigation plans

    • Seismic hazard analysis & risk management

  • Modular approach, step-by-step improvement

    • Maximum probable earthquakes used in seismic disaster mitigation plans

    • Efficiency/priority of seismic retrofit of public works

    • Insurance rates for private residential and commercial buildings

Development of Earthquake Assessment Methodology in NCREE, Yeh


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