Earthquake Damage and Loss Estimation Methodology and Data for Salt Lake County, Utah (ATC-36)

Christopher Rojahn; Stephanie A. King; Roger E. Scholl; Anne S. Kiremidjian; Lawrence D. Reaveley; Robert R. Wilson

doi:10.1193/1.1585972

Earthquake Damage and Loss Estimation Methodology and Data for Salt Lake County, Utah (ATC-36)

Earthquake Spectra ◽

10.1193/1.1585972 ◽

1997 ◽

Vol 13 (4) ◽

pp. 623-642 ◽

Cited By ~ 8

Author(s):

Christopher Rojahn ◽

Stephanie A. King ◽

Roger E. Scholl ◽

Anne S. Kiremidjian ◽

Lawrence D. Reaveley ◽

...

Keyword(s):

Salt Lake ◽

Earthquake Damage ◽

Database Management System ◽

Lake County ◽

Ground Shaking ◽

Ground Failure ◽

Software Application ◽

Fire Following Earthquake ◽

Lifeline Systems ◽

Gis Software

As a follow on to the Applied Technology Council (ATC) project to develop earthquake damage evaluation data for California (ATC-13 project), ATC has conducted a project to update and translate the ATC-13 data and methodology for use in Salt Lake County, Utah (ATC-36 project). Methodology has been developed and/or updated for: (1) estimation of damage due to ground shaking, (2) estimation of damage due to collateral loss causes such as fault rupture, ground failure, inundation, and fire following earthquake, (3) estimation of time to restore damaged facilities to pre-earthquake usability, and (4) estimation of deaths and injuries. In addition, an electronic inventory of approximately 200,000 structures (buildings and lifeline systems) within Salt Lake County has been developed. The data and methodology have been developed for implementation in a geographic information system (GIS) application, or in a non-GIS software application, such as a relational database management system or spreadsheet.

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Earthquake Damage and Loss Evaluation for California

Earthquake Spectra ◽

10.1193/1.1585410 ◽

1986 ◽

Vol 2 (4) ◽

pp. 767-782 ◽

Cited By ~ 6

Author(s):

Christopher Rojahn ◽

Roland L. Sharpe ◽

Roger E. Scholl ◽

Anne S. Kiremidjian ◽

Richard V. Nutt ◽

...

Keyword(s):

Earthquake Damage ◽

Loss Of Function ◽

Damage Factor ◽

Physical Damage ◽

Ground Shaking ◽

Ground Failure ◽

Damage Probability Matrices ◽

Consensus Opinion ◽

Damage States ◽

Time Required

Consensus-opinion earthquake damage and loss estimates and companion loss estimation and inventory methdology have been developed for existing facilities in California. These data and methodology are needed to provide input into computer simulation methodologies developed by the Federal Emergency Management Agency (FEMA) that estimate the economic impacts of real or hypothetical California earthquakes on the state, region, and nation. Data and methodology developed include: consensus opinion damage-factor estimates (expected physical damage due to ground shaking); methodology to adjust damage-factor estimates to account for construction quality; methodology to estimate the effects of collateral hazards such as ground failure, fault rupture, and inundation; loss-of-function data and methodology to estimate the time it takes to restore damaged facilities to their pre-earthquake usability; methodology to estimate deaths and injuries; and inventory data and methodology for all types of existing industrial, commercial, residential, utility and transportation facilities in California. Damage-factor estimates are provided for Modified Mercalli Intensities VI through XII in the form of Damage Probability Matrices. Seven damage states are considered: 0%, 0-1%, 1-10%, 10-30%, 30-60%, 60-100%, and 100% damage. Loss-of-Function estimates, which specify the time required to restore a facility to 30%, 60%, and 100% of the pre-earthquake usability, are provided for these same seven damage states.

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A GIS-Based Assessment of Earthquake Property Damage and Casualty Risk: Salt Lake County, Utah

Earthquake Spectra ◽

10.1193/1.1585703 ◽

1993 ◽

Vol 9 (1) ◽

pp. 11-33 ◽

Cited By ~ 8

Author(s):

Philip C. Emmi ◽

Carl A. Horton

Keyword(s):

Salt Lake ◽

Network Models ◽

Policy Implications ◽

Property Damage ◽

Damage Functions ◽

Lake County ◽

Ground Shaking ◽

Triangular Irregular Network ◽

Earthquake Casualty ◽

Wasatch Fault

This paper offers a probabilistic assessment of expected property damage and casualty risk due to the earthquake ground shaking hazard affecting Salt Lake County, Utah (population = 725,600). Salt Lake County is bisected by a segment of the Wasatch Fault. It is also at risk from twenty-one other nearby fault segments. Findings are based on (1) a microzonation of the earthquake ground shaking hazard, (2) an inventory of buildings by value, structural frame type and use, (3) earthquake damage functions defining the performance of buildings as a function of ground shaking intensity, (4) data on the density of residential and employee populations, and (5) earthquake casualty functions defining casualty risk as a function of building damage. The analysis is supported by the algebraic combination of digital map layers within a vector-based geographic information system. Triangular irregular network models show the expected distributions of casualties. Hazard mitigation policy implications are also considered.

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