## 2 Interactive Geospatial Database and Data  
To investigate site-specific surface and subsurface conditions in Daejeon city, a comprehensive repository of data, such as borehole logs, a digital elevation model (DEM), an administrative division map, and geological maps, was collated based on existing ground survey data. (Figure 1). The study area including administrative division is within 35.0 km west to east and 44.0 km north to south. The surficial thematic coverages having high spatial resolution in Daejeon city are especially collected. The study area was defined as the area covered by the Daejeon administrative division map (Figure 1a), which was obtained from the National Geographic Information Institute in Korea. The administrative district was specified along with spatial coordinates. The DEM of the study area (Figure 1b) consisted of a grid with a 5 m \(\times\) 5 m mesh size, maximum elevation of approximately 900 m, and an average standard deviation of 5.8 m. A slope map (Figure 1c) was extracted from the DEM, and the maximum slope was approximately 80\({}^{\circ}\). A geological map of the study area (boundaries and faults; Figure 1d) was generated from the 1:50,000 scale geological map data that was obtained from the geological information management system at the Korea Institute of Geoscience and Mineral Resources. The average elevation and slope in building zone (Figure 1e), where Quaternary alluvium was mainly distributed, were 15 m and 6\({}^{\circ}\), respectively. The drainage basin along Gapcheon stream are covered in the central region in building zone. The susceptible region against seismic site effect was mainly reported at the basin or basin-edge regions [19]. The main bedrock in the Daejeon area are metamorphic sedimentary and igneous rocks that have undergone low-medium grade metamorphism, and granitic and mafic intrusions [24]. The urbanized river basin of Daejeon city comprises Miocene (\(\sim\)20 mya) non-marine to deep marine sedimentary strata [25]. Soil development is mainly a result of fluvial landform processes. Zones with thick soils and deep bedrock are susceptible to ground motion amplification due to site effects during earthquakes. The DEM and geological map was used to review the performance of stepwise geoprocessing procedures and combine with the geotechnical characteristic. Figure 1: Testbed and geospatial database for Daejeon city: **(a)** administrative area map; **(b)** digital elevation model (5 m \(\times\) 5 m) ([[http://map.ngii.go.kr/](http://map.ngii.go.kr/)]([http://map.ngii.go.kr/](http://map.ngii.go.kr/))) [26]; **(c)** DEM-based slope map (5 m \(\times\) 5 m); **(d)** geological map (1:50,000 scale) ([[https://mgeo.kigam.re.kr/](https://mgeo.kigam.re.kr/)]([https://mgeo.kigam.re.kr/](https://mgeo.kigam.re.kr/))) [27]; **(e)** buildings; **(f)** borehole dataset ([[https://www.geinfo.or.kr/](https://www.geinfo.or.kr/)]([https://www.geinfo.or.kr/](https://www.geinfo.or.kr/))) [28]. The abbreviation in geological map: Jdi (Ironside Mountain batholith); Jgr (Jurassic granite); Kad (acidic dyke); Kjy (biotite-hornblende tonalite); Kpbfgr (porphyriniotic granite); PCEkbgn (Precambrian limestone); Qa (Quaternary alluvium); bgn (banded gneiss); mgn (mafic gneiss). The database is overlaid on google map ([[https://www.google.com/maps](https://www.google.com/maps)]([https://www.google.com/maps](https://www.google.com/maps))). The borehole log datasets (Figure 1f) were specifically designed as a geotechnical DB and are essential for characterization of seismic site effects. They were obtained from the Geo-Info system of the Korea Institute of Civil Engineering and Building Technology, and contained 3304 drilling survey datasets from a total of 153 projects. Engineering geo-layers were classified as fill layer (FL), alluvial soil (AS), weathered soil (WS), weathered rock (WS), and soft rock (SR), and their thicknesses and depths were extracted.