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100m-Resolution Site Condition Map of China

Description: 

The updating of seismic ground motion parameter zoning map requires more accurate site classification maps to account for adjustments related to site conditions. When site investigations are not feasible, proxy-based estimations of V_S30 are typically used to evaluate site conditions. We compiled a nationwide borehole database from research documents and technical reports, with approximately 82.02% of the profiles having depths greater than 20m. Unlike traditional approaches that primarily consider surface characteristics, we developed a hybrid V_S30 model considering both surface and subsurface site information. Our new model uses surface geology category and subsurface bedrock depth as indicators. The geological units across China were classified into 33 Quaternary deposit units and 5 rock units according to geological age and genesis. Combined with 1:500,000 geological maps and a 100-m resolution depth-to-bedrock map, we generated a nationwide V_S30 map. We made regional adjustments based on the geological environmental zoning and developed a 100-m resolution Chinese site classification map. Validation through borehole data and comparisons with previous models demonstrated that the V_S30 results and Chinese site classification derived from our model effectively classify site conditions on a national scale. Additionally, in plain areas, our model outperforms slope-based ones in distinguishing between Chinese site classes II and III, as well as NEHRP classes C and D.

Session: Station Installations and Site Conditions, a Quest for Improved Strong Motion Database [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Junju

Student Presenter: No

Invited Presentation: 

Poster Number: 65

Authors