Spatial zonations for regional assessment of seismic site effects in the Seoul metropolitan area |
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| Institution: | 1. RTI International, 1400 Main Street, Suite 310, Waltham, MA 02451, United States;2. Arnold School of Public Health, University of South Carolina, 921 Assembly St., 1st Fl. Suite, RM 131, Columbia, SC 29208, United States;3. University of Michigan, Institute for Social Research, 426 Thompson Road, Room 2346, Ann Arbor, MI 48106-1248, United States;4. Alliance for a Healthier Generation, Portland OR, United States;5. Wellesley College, 106 Central Street, Wellesley, MA 02481, United States;6. YMCA of the USA, 1129 20th St., NW, Suite 301, Washington, DC 20036, United States;7. Lakeshore Foundation, National Center on Health, Physical Activity and Disability, 4000 Ridgeway Drive, Birmingham, AL 35209, United States |
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| Abstract: | Earthquake-induced hazards are profoundly affected by site effects related to the amplification of ground motions, which are strongly influenced by local geologic conditions such as soil thickness or bedrock depth and soil stiffness. In this study, an integrated geographic information system (GIS)-based system for geotechnical data, called the geotechnical information system (GTIS), was developed to establish a regional counterplan against earthquake ground motions in the Seoul metropolitan area. In particular, to reliably predict spatial geotechnical information, a procedural methodology for building the GTIS within a GIS framework was developed and applied to the Seoul area in Korea. To build the GTIS, pre-existing geotechnical data were collected in and around the study area, and then a walk-over site survey was conducted to acquire surface geo-knowledge data. In addition, the representative shear wave velocities for geotechnical layers were derived by statistically analyzing many seismic test data in Korea. The GTIS was used in a practical application to estimate site effects in the study area; seismic zoning maps of geotechnical earthquake parameters, such as the depth to bedrock and the site period, were created and presented as a regional synthetic strategy for earthquake risk assessment. Furthermore, seismic zonation of site classification was also performed to determine the site amplification coefficients for seismic design and seismic performance evaluation at any site and administrative sub-unit in the study area. The methodology and results of the case study of seismic zonations in the Seoul area verified that the GIS-based GTIS can be very useful for the regional estimation of seismic risk and also to support decisions regarding seismic hazard mitigation, particularly in the metropolitan area. |
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| Keywords: | Seismic zonation Site effects Earthquake geotechnical information Site period GIS |
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