Methods for constructing VS30 maps from geology, borehole and topography data


  • Nguyen Thuy Linh Institute of Geophysics, Vietnam Academy of Science and Technology
  • Bui Van Duan Institute of Geophysics, Vietnam Academy of Science and Technology
  • Nguyen Anh Duong* Institute of Geophysics, Vietnam Academy of Science and Technology


VS30, Ho Chi Minh city, geology, borehole, topography slope, soil classification


The average shear wave velocity in the upper 30 meters of a soil profile (VS30) is used in building codes to separate sites into classes for the purpose of earthquake engineering design. In this paper, a method of Thompson E.N. and Wald D.J. (2012) was applied to build a VS30 map of Ho Chi Minh city using, many different data such as geologic, topographic and shear wave velocities derived from the Standard Penetration Test (SPT) data of 104 boreholes. The VS30 values are mainly within two ranges of 0 -180 m/s and 180 - 240 m/s corresponding to two site classes of type D and C, respectively, according to the soil classification in Vietnam Construction Code TCVN 9386:2012. The site class of type C is mainly distributed in the districts located in the northern area of Ho Chi Minh city, while the soft soil with VS30 < 180 m/s is concentrated in the south of the city. This result shows that this method can reduce the uncertainty of VS30 map by up to 11.4% relative to the topography slope-only approach. Moreover, the average topographic slope of Ho Chi Minh city area is about 0.0024. It implies that Ho Chi Minh city area is in a stable continental region, which is suitable to apply ground motion prediction equations developed for seismic stable regions for the purpose of seismic hazard assessment. Our study is a prerequisite for the wide application of this method to build VS30 maps for other areas in Vietnam.ReferencesAbrahamson, N., Atkinson, G., Boore, D.M., Bozorgnia, Y, Campbell, K., Chiou, B., Idriss, I.M., Silva, W., and Youngs, R., 2008. Comparisons of the NGA ground-motion relations. Earthquake Spectra 24(1), 45-66.Allen, T. I. and Wald D. J., 2009. On the Use of High-Resolution Topographic Data as a Proxy for Seismic Site Conditions (VS30). Bull. Seism. Soc. Am., 99(2A), 935-943.Borcherdt, R. D., 1994. Estimates of site-dependent response spectra for design (methodology and justification). Earthquake Spectra 10, 617-654.Bozorgnia, Y., N. A. Abrahamson, L. Al Atik, T. D. Ancheta, G. M. Atkinson, J. W. Baker, A. Baltay, D. M. Boore, K. W. Campbell, B. S.-J. Chiou, et al., 2014. NGA-West2 research project, Earthquake Spectra, 30(3), 973-987.Bui Thi Nhung and Nguyen Hong Phuong, 2015. Local site classification for the urban region of Hanoi city. Journal of Sciences of the Earth, 33(4), 690-694 (in Vietnamese).Bui Van Duan, Ha Thi Giang, Nguyen Anh Duong, and Pham Dinh Nguyen, 2015. About factors related to the occurrence of earthquakes in the Song Tranh 2 hydropower area in period 2011-2014. Journal of Sciences of the Earth, 37(3), 228-240 (in Vietnamese).Building Seismic Safety Council, 2015. Recommended Seismic Provisions for New Buildings and Other Structures, Part 1: Provisions, Part 2: Commentary. Report No. FEMA P-1050-1, Federal Emergency Management Agency, Washington, D.C., 515p.CEN, 2004. EN 1998-1:2004, Eurocode 8: Design of structures for earthquake resistance - Part 1: General rules, seismic actions and rules for buildings. European committee for standardization, Brussels, Belgium.Cat Nguyen Hung et al., 2009. Seismic microzoning of Ho Chi Minh city. Final report of scientific research funding program supported by Ho Chi Minh City Goverment (in Vietnamese).Imai, T., 1977. P and S wave velocities of the ground in Japan. Proceeding of IX International Conference on Soil Mechanics and Foundation Engineering, 2, 127-132.International Code Council, 2009. 2009 IBC International Building Code, Country Club Hills, Illinois, 730p.Lee, C. T. and B. R. Tsai, 2008. Mapping VS30 in Taiwan. Terr. Atmos. Ocean. Sci., 19, 671-682, doi: 10.3319/TAO.2008.19.6.671(PT).Nguyen Anh Duong, T. Sagiya, F. Kimata, D. T. Tran, Q. H. Vy, C. C. Duong, X. B. Nguyen, and D. X. Nguyen, 2013. Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements, Earth Planets Space, 65(12), 1399-1410, doi:10.5047/eps.2013.09.010.Nguyen Hong Phuong and Pham The Truyen, 2014. Probabilistic seismic hazard assessment for the South Central Vietnam. Vietnam J. Earth Sci., 36(4) 451-461.Nguyen Ngoc Hoa (editor), Duong Van Cau, Dang Ngoc Phan, Doan Sinh Huy, Hoang Ngoc Ky, Le Minh Thuy, Nguyen Van Quang, Truong Cong Duong, 1995. Geological and mineral map of Vietnam on a scale of 1:200.000 (Ho Chi Minh city sheet; C 48 - XI). Geological Survey of Vietnam, Hanoi (in Vietnamese).Nguyen Sinh Minh, Pham Dinh Nguyen et al., 2014. Seismic hazard assessment for the expanded Hanoi city, establishing of detail seismic zoning map for Ha Dong, Son Tay, Hoa Lac areas by scaled 1:25.000, building of database of ground motion features according to the above maps. Final report of scientific research funding program supported by Hanoi City Goverment (in Vietnamese).Petersen, M., Stephen Harmsen, Charles Mueller, Kathleen Haller, James Dewey, Nicolas Luco, Anthony Crone, David Lidke, and Kenneth Rukstales, 2007. Documentation for the Southeast Asia Seismic Hazard Maps. Administrative Report September 30, 2007, U.S. Geological Survey, Reston, Virginia.Phan Trong Trinh, 2012. Neo-tectonics and contemporary geodynamics in Vietnam sea area and adjacency. Publishing House for Science and Technology, Hanoi, 330p (in Vietnamese).Phan Trong Trinh, Ngo Van Liem, Nguyen Van Huong, Hoang Quang Vinh, Bui Van Thom, Bui Thi Thao, Mai Thanh Tan, Nguyen Hoang, 2012. Late Quaternary tectonics and seismotectonics along the Red River fault zone, North Vietnam. Earth-Science Reviews, 114(3), 224-235.Phan Trong Trinh, Hoang Quang Vinh, Nguyen Van Huong, Ngo Van Liem, 2013. Active fault segmentation and seismic hazard in Hoa-Binh reservoir, Vietnam. Cent. Eur. J. Geosci, 5(2), 223-235.Romero, S., and Rix, G.J., 2001. Regional Variations in Near-Surface Shear Wave Velocity in the Greater Memphis Area. Engineering Geology 62, 137-158.Simons, W. J. F., A. Socquet, C. Vigny, B. A. C. Ambrosius, S. Haji Abu, Chawat Promthong, C. Subarya, D. A. Sasito, S. Matheussen, P. Morgan, and W. Spakman, 2007. A decade of GPS in Southeast Asia: Resolving Sundaland motion and boundaries, J. Geophys. Res., 112, B06420, doi:10.1029/2005JB003868.Thompson, E.M and Wald D.J., 2012. Developing VS30 Site-Condition Maps by Combining Observations with Geologic and Topographic Constraint. The 15th World Conference on Earthquake Engineering: September 24-28, 2012, Lisbon, Portugal. USGS Publications Warehouse.Toro, G. R., Abrahamson, N. A. and Schneider, J. F., 1997. Engineering Model of Strong Ground Motions from Earthquakes in the Central and Eastern United States. Seismological Research Letters, 68(1), 41-57.Tran Thi My Thanh, Nguyen Le Minh, Vi Van Vung and Kojiro Irikura, 2014. Values for peak ground acceleration and peak ground velocity using in seismic hazard assessment for Song Tranh 2 hydropower region. Vietnam J. Earth Sci., 36(4), 462-469.Tran Thi My Thanh, Vi Van Vung, Hiroe Miyake and Kojiro Irikura, 2015. Simulated fround motion of the earthquake on Octorber 22nd, 2012, M4.6 at Song Tranh 2 dam area. Journal of Sciences of the Earth, 37(3), 241-251 (in Vietnamese).Vietnam Construction Code TCVN 9386:2012, 2012. Design of structures for earthquake resistances. Hanoi, 288p (in Vietnamese).Vu Trong Tan et al., 2010. Application of seismic borehole methods and establishing the calculating procedure of elastic parameters to serve for foundation structures and seismic resistant construction in Ho Chi Minh City and neighboring provinces. Final report of R-RD scientific research funding program supported by Ministry of Natural Resources and Environment (in Vietnamese).Wald, D. J. and Trevor I. Allen, 2007. Topographic Slope as a Proxy for Seismic Site Conditions and Amplification. Bull. Seism. Soc. Am., 97(5), 1379-1395.Wills, C.J. and Clahan, K.B., 2006. Developing a Map of Geologically Defined Site-Condition Categories for California. Bull. Seism. Soc. Am., 96(4A), 1483-1501.Yong, A., Hough, S.E., Abrams, M.J., Cox, H.M., Wills, C.J., and Simila, G.W., 2008. Site Characterization Using Integrated Imaging Analysis Methods on Satellite Data of the Islamabad, Pakistan, Region. Bull. Seism. Soc. Am., 98(6), 2679-2693.Yong, A., Hough, S.E., Iwahashi, J., and Braverman, A., 2012. A Terrain-Based Site-Conditions Map of California with Implications for the Contiguous United States. Bull. Seism. Soc. Am., 102(1), 114-128.


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Linh, N. T., Duan, B. V., & Duong*, N. A. (2016). Methods for constructing VS30 maps from geology, borehole and topography data. VIETNAM JOURNAL OF EARTH SCIENCES, 38(4), 356–371. Retrieved from