J. Eng. Technol. Sci., Vol. 49, No. 4, 2017, 457-471 457 Received February 15 th , 2017, Revised July 31 st , 2017, Accepted for publication September 26 th , 2017. Copyright ©2017 Published by ITB Journal Publisher, ISSN: 2337-5779, DOI: 10.5614/j.eng.technol.sci.2017.49.4.3 Development of Nationwide Vs30 Map and Calibrated Conversion Table for Indonesia using Automated Topographical Classification Masyhur Irsyam 1,2, *, Muhammad Asrurifak 2 , Reguel Mikhail 1,2 , In In Wahdiny 2 , Siska Rustiani 3 & Munirwansyah 4 1 Geotechnical Engineering Research Group, Faculty of Civil and Enviromental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia 2 Research Center for Disaster Mitigation, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia 3 University of Parahyangan, Jalan Ciumbuleuit 94, Bandung 40141, Indonesia 4 University of Syiah Kuala, Jalan Teuku Nyak Arief Darussalam, Banda Aceh 23111, Indonesia *E-mail: masyhur.irsyam@yahoo.co.id Abstract. A nationwide Vs 30 map for Indonesia was developed based on automated topographic classification from 90-m grid digital elevation data and their correlation with Vs 30 . Automated topographic classification has been proposed by Iwahashi and Pike (2007) and a procedure to convert topographic class into Vs 30 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 Vs 30 correlation by Imamura and Furuta to convert topographic class into Vs 30 and construct a Vs 30 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 Vs 30 map. The developed nationwide Vs 30 map will be very useful for disaster mitigation programs and for preliminary design of earthquake resistant buildings and infrastructure in Indonesia. Keywords: automated topographical classification; conversion; seismic hazard maps; standard penetration test; Vs 30 . 1 Introduction Disaster mitigation programs and design of earthquake resistant buildings and infrastructure usually require an earthquake hazard map at ground surface. Development of earthquake hazard maps at ground surface involves predicting shaking intensity on bedrock from seismic hazard analysis and estimating the ground amplification factor from a local site characteristics study.