Seismic site characteristics of shallow sediments in the Bangkok Metropolitan Region, and their inherent relations

This paper presents the site characteristics of soft deposits in Bangkok Metropolitan Region, and their inherent relations, which were explored using microtremor observations. The predominant period ( T P ) and shear wave velocity ( V S ) profiles from the surface to a 100-m depth at 150 sites over...

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Bibliographic Details
Published in:Bulletin of engineering geology and the environment 2019-04, Vol.78 (3), p.1327-1343
Main Authors: Jirasakjamroonsri, Amorntep, Poovarodom, Nakhorn, Warnitchai, Pennung
Format: Article
Language:English
Subjects:
Autocorrelation
Clay
Correlation analysis
Data processing
Earth and Environmental Science
Earth Sciences
Foundations
Geoecology/Natural Processes
Geoengineering
Geological engineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Methods
Metropolitan areas
Nature Conservation
Original Paper
Phase velocity
Profiles
Regression analysis
Sediments
Seismic velocities
Shear wave velocities
Soft clay
Spatial distribution
Spatial variations
Velocity
Wave velocity
Wavelengths
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Summary:This paper presents the site characteristics of soft deposits in Bangkok Metropolitan Region, and their inherent relations, which were explored using microtremor observations. The predominant period ( T P ) and shear wave velocity ( V S ) profiles from the surface to a 100-m depth at 150 sites over an area of approximately 150 × 200 km were explored using the Horizontal-to-Vertical (H/V) spectral ratio method and the Spatial Autocorrelation (SPAC) method, respectively. Spatial variations of T P and average V S are presented in maps and discussed with the distribution of soft clay. The results show that the shallow structure is rather uniform in the central area, having low V S , long T P , and thick soft clay. V S increases, while T P tends to decrease gradually towards the north and east and more sharply towards the west. Using a number of the observed site characteristics, relations among the average V S at different depths and T P were examined. Regression analysis revealed high correlations and almost linear relations among them, suggesting that V S at deep strata could be simply estimated from the shallow V S or T P . Finally, a simple scheme to estimate the V S profile using only the phase velocity at specific wavelengths is proposed.
ISSN:1435-9529
1435-9537
DOI:10.1007/s10064-017-1220-3