Development of Nationwide Vs30 Map and Calibrated Conversion Table for Indonesia using Automated Topographical Classification
Keywords:automated topographical classification, conversion, seismic hazard maps, standard penetration test, Vs30.
AbstractA nationwide Vs30 map for Indonesia was developed based on automated topographic classification from 90-m grid digital elevation data and their correlation with Vs30. Automated topographic classification has been proposed by Iwahashi and Pike (2007) and a procedure to convert topographic class into Vs30 maps has been developed by Imamura and Furuta (2015) based on Vs data from J-SHIS (Japan Seismic Hazard Information System). In order to be suitable for Indonesia, calibration work according to Imamura and Furuta's procedure should be conducted since the geotechnical conditions in Japan may not be the same as in Indonesia. This paper presents adjustment of the Vs30 correlation by Imamura and Furuta to convert topographic class into Vs30 and construct a Vs30 map of Indonesia. This correlation was calibrated by using Vs data from BMKG (Indonesian Agency for Meteorological, Climatological, and Geophysics) as well as standard penetration test logs that were collected by the authors. Utilization of local field measurement data will certainly enhance the reliability of the Vs30 map. The developed nationwide Vs30 map will be very useful for disaster mitigation programs and for preliminary design of earthquake resistant buildings and infrastructure in Indonesia.
SNI 1726:2012, Earthquake Resistant Design Code for Building and non-Building of Indonesia, Indonesian National Standardization Agency, 2012. (Text in Indonesian)
Irsyam, M., Sengara, I.W., Aldiamar, F., Widiyantoro, S., Triyoso, W., Hilman, D., Kertapati, E., Meilano, I., Suhardjono, Asrurifak, M. & Ridwan, M., Summary of Study Results by Revision Team of indonesian Earthquake Map, Research Report, Bandung, 2010. (Text in Indonesian)
Imamura, S. & A. Furuta, A Practical Method of Nationwide Vs30 Mapping with 250m Grids for Developing Countries by Automated Topographical Classification and Published Data in Japan, Proceeding of the 12th SEGJ international Symposium, 2015.
Matsuoka, M., Wakamatsu, K., Fujimoto, K. & Midorikawa, S., Average Shear-wave Velocity Mapping using Japan Engineering Geomorphologic Classification Map, Journal of Structural Mechanics and Earthquake Engineering 23(1), pp. 57s-68s, 2006.
Iwahashi, J., & Pike, R. J., Automated Classifications of Topography from DEMs by an Unsupervised Nested-means Algorithm and a Three-part Geometric Signature, Geomorphology, 86(3-4), pp. 409-440, 2007.
Mikhail, R., Study of Correlation between Topographic Class and Vs30 Value with Development of Site Class Map for Indonesia, Master Thesis, Bandung Insitute of Technology, Bandung, Indonesia, 2016. (Text in Indonesian)
Mikhail, R., Irsyam, M. & Asrurifak, M., Study of National Vs30 Map Development Based on Correlation Between Automated Topographical Classification and Field Test Data, Proceedings of 20th Annual National Conference on Geotechnical Engineering, Jakarta, pp. 217-224, 2016. (Text in Indonesian)
Irsyam, M., Hendriyawan, Asrurifak, M., Meilano, I., Widiyantoro, S., Sakti, L. M., Sabaruddin, A., Faisal, L., Simatupang, P., Hutapea, B.M., & Afriansyah, T., Recents Efforts to Mitigate the Impact of Earthquake Hazard in Indonesia from Geotechnical Engineering Perspective, Keynote Lecture, Kyoto Seminar 2016 Development in Earthquake Geotechnics, June 13-15, Kyoto University, Kyoto, Japan, 2016.
Ohta, Y. & Goto, N., Empirical Shear Wave Velocity Equations in terms of Characteristic Soils Indexes, Earthquake Engineering and Structural Dynamics, 6, pp. 167-187, 1978.
Imai, T. & Tonouchi, K., Correlation of N-value with S-wave Velocity and Shear Modulus, Proceedings of the 2nd European symposium of penetration testing, Amsterdam, pp. 57-72, 1982.
Ridwan, M., Site Class Map of Jakarta City Based on SPT and Microtremor Array Results, Unpublished Manuscript, 2016. (Text in Indonesian)
Partono, W., Seismic Microzonation Map Design for Semarang City by Developing Seismic Hazard Program and Adjusting Building Fragility Condition, Dissertation, Diponegoro University, 2015. (Text in Indonesian)